upgrade ESLint config (#5472)

package-lock.json

@@ -144,8 +144,8 @@
       }
     },
     "@sveltejs/eslint-config": {
-      "version": "github:sveltejs/eslint-config#848ce6464a9ae9c2f3a3095474701dfe9ab851df",
+      "version": "github:sveltejs/eslint-config#673335baf2ebc4b845eca9ea8eb51a050fd5cc25",
-      "from": "github:sveltejs/eslint-config#v5.0.0",
+      "from": "github:sveltejs/eslint-config#v5.2.0",
       "dev": true
     },
     "@tootallnate/once": {

package.json

@@ -37,7 +37,7 @@
     "posttest": "agadoo internal/index.mjs",
     "prepublishOnly": "npm run lint && PUBLISH=true npm test",
     "tsd": "tsc -p src/compiler --emitDeclarationOnly && tsc -p src/runtime --emitDeclarationOnly",
-    "lint": "eslint \"{src,test}/**/*.{ts,js}\""
+    "lint": "eslint '{src,test}/**/*.{ts,js}'"
   },
   "repository": {
     "type": "git",
@@ -63,7 +63,7 @@
     "@rollup/plugin-sucrase": "^3.0.0",
     "@rollup/plugin-typescript": "^2.0.1",
     "@rollup/plugin-virtual": "^2.0.0",
-    "@sveltejs/eslint-config": "github:sveltejs/eslint-config#v5.0.0",
+    "@sveltejs/eslint-config": "github:sveltejs/eslint-config#v5.2.0",
     "@types/mocha": "^7.0.0",
     "@types/node": "^8.10.53",
     "@typescript-eslint/eslint-plugin": "^3.0.2",

src/compiler/compile/Component.ts

@@ -157,7 +157,7 @@ export default class Component {
 				) || { start: 0, end: 0 };
 				this.warn(svelteOptions, {
 					code: 'custom-element-no-tag',
-					message: `No custom element 'tag' option was specified. To automatically register a custom element, specify a name with a hyphen in it, e.g. <svelte:options tag="my-thing"/>. To hide this warning, use <svelte:options tag={null}/>`
+					message: 'No custom element \'tag\' option was specified. To automatically register a custom element, specify a name with a hyphen in it, e.g. <svelte:options tag="my-thing"/>. To hide this warning, use <svelte:options tag={null}/>'
 				});
 			}
 			this.tag = this.component_options.tag || compile_options.tag;
@@ -241,7 +241,7 @@ export default class Component {
 			const { compile_options, name } = this;
 			const { format = 'esm' } = compile_options;
 
-			const banner = `${this.file ? `${this.file} ` : ``}generated by Svelte v${'__VERSION__'}`;
+			const banner = `${this.file ? `${this.file} ` : ''}generated by Svelte v${'__VERSION__'}`;
 
 			const program: any = { type: 'Program', body: result.js };
 
@@ -458,16 +458,16 @@ export default class Component {
 	extract_exports(node) {
 		if (node.type === 'ExportDefaultDeclaration') {
 			this.error(node, {
-				code: `default-export`,
+				code: 'default-export',
-				message: `A component cannot have a default export`
+				message: 'A component cannot have a default export'
 			});
 		}
 
 		if (node.type === 'ExportNamedDeclaration') {
 			if (node.source) {
 				this.error(node, {
-					code: `not-implemented`,
+					code: 'not-implemented',
-					message: `A component currently cannot have an export ... from`
+					message: 'A component currently cannot have an export ... from'
 				});
 			}
 			if (node.declaration) {
@@ -478,7 +478,7 @@ export default class Component {
 							variable.export_name = name;
 							if (variable.writable && !(variable.referenced || variable.referenced_from_script || variable.subscribable)) {
 								this.warn(declarator, {
-									code: `unused-export-let`,
+									code: 'unused-export-let',
 									message: `${this.name.name} has unused export property '${name}'. If it is for external reference only, please consider using \`export const ${name}\``
 								});
 							}
@@ -501,7 +501,7 @@ export default class Component {
 
 						if (variable.writable && !(variable.referenced || variable.referenced_from_script || variable.subscribable)) {
 							this.warn(specifier, {
-								code: `unused-export-let`,
+								code: 'unused-export-let',
 								message: `${this.name.name} has unused export property '${specifier.exported.name}'. If it is for external reference only, please consider using \`export const ${specifier.exported.name}\``
 							});
 						}
@@ -550,7 +550,7 @@ export default class Component {
 			if (name[0] === '$') {
 				this.error(node as any, {
 					code: 'illegal-declaration',
-					message: `The $ prefix is reserved, and cannot be used for variable and import names`
+					message: 'The $ prefix is reserved, and cannot be used for variable and import names'
 				});
 			}
 
@@ -568,7 +568,7 @@ export default class Component {
 			if (name[0] === '$') {
 				this.error(node as any, {
 					code: 'illegal-subscription',
-					message: `Cannot reference store value inside <script context="module">`
+					message: 'Cannot reference store value inside <script context="module">'
 				});
 			} else {
 				this.add_var({
@@ -629,7 +629,7 @@ export default class Component {
 			if (name[0] === '$') {
 				this.error(node as any, {
 					code: 'illegal-declaration',
-					message: `The $ prefix is reserved, and cannot be used for variable and import names`
+					message: 'The $ prefix is reserved, and cannot be used for variable and import names'
 				});
 			}
 
@@ -867,8 +867,8 @@ export default class Component {
 
 				if (name[1] !== '$' && scope.has(name.slice(1)) && scope.find_owner(name.slice(1)) !== this.instance_scope) {
 					this.error(node, {
-						code: `contextual-store`,
+						code: 'contextual-store',
-						message: `Stores must be declared at the top level of the component (this may change in a future version of Svelte)`
+						message: 'Stores must be declared at the top level of the component (this may change in a future version of Svelte)'
 					});
 				}
 			}
@@ -935,7 +935,7 @@ export default class Component {
 										// TODO is this still true post-#3539?
 										component.error(declarator as any, {
 											code: 'destructured-prop',
-											message: `Cannot declare props in destructured declaration`
+											message: 'Cannot declare props in destructured declaration'
 										});
 									}
 
@@ -1379,7 +1379,7 @@ function process_component_options(component: Component, nodes) {
 				switch (name) {
 					case 'tag': {
 						const code = 'invalid-tag-attribute';
-						const message = `'tag' must be a string literal`;
+						const message = "'tag' must be a string literal";
 						const tag = get_value(attribute, code, message);
 
 						if (typeof tag !== 'string' && tag !== null)
@@ -1387,15 +1387,15 @@ function process_component_options(component: Component, nodes) {
 
 						if (tag && !/^[a-zA-Z][a-zA-Z0-9]*-[a-zA-Z0-9-]+$/.test(tag)) {
 							component.error(attribute, {
-								code: `invalid-tag-property`,
+								code: 'invalid-tag-property',
-								message: `tag name must be two or more words joined by the '-' character`
+								message: "tag name must be two or more words joined by the '-' character"
 							});
 						}
 
 						if (tag && !component.compile_options.customElement) {
 							component.warn(attribute, {
 								code: 'missing-custom-element-compile-options',
-								message: `The 'tag' option is used when generating a custom element. Did you forget the 'customElement: true' compile option?`
+								message: "The 'tag' option is used when generating a custom element. Did you forget the 'customElement: true' compile option?"
 							});
 						}
 
@@ -1405,7 +1405,7 @@ function process_component_options(component: Component, nodes) {
 
 					case 'namespace': {
 						const code = 'invalid-namespace-attribute';
-						const message = `The 'namespace' attribute must be a string literal representing a valid namespace`;
+						const message = "The 'namespace' attribute must be a string literal representing a valid namespace";
 						const ns = get_value(attribute, code, message);
 
 						if (typeof ns !== 'string')
@@ -1415,12 +1415,12 @@ function process_component_options(component: Component, nodes) {
 							const match = fuzzymatch(ns, valid_namespaces);
 							if (match) {
 								component.error(attribute, {
-									code: `invalid-namespace-property`,
+									code: 'invalid-namespace-property',
 									message: `Invalid namespace '${ns}' (did you mean '${match}'?)`
 								});
 							} else {
 								component.error(attribute, {
-									code: `invalid-namespace-property`,
+									code: 'invalid-namespace-property',
 									message: `Invalid namespace '${ns}'`
 								});
 							}
@@ -1446,14 +1446,14 @@ function process_component_options(component: Component, nodes) {
 
 					default:
 						component.error(attribute, {
-							code: `invalid-options-attribute`,
+							code: 'invalid-options-attribute',
-							message: `<svelte:options> unknown attribute`
+							message: '<svelte:options> unknown attribute'
 						});
 				}
 			} else {
 				component.error(attribute, {
-					code: `invalid-options-attribute`,
+					code: 'invalid-options-attribute',
-					message: `<svelte:options> can only have static 'tag', 'namespace', 'accessors', 'immutable' and 'preserveWhitespace' attributes`
+					message: "<svelte:options> can only have static 'tag', 'namespace', 'accessors', 'immutable' and 'preserveWhitespace' attributes"
 				});
 			}
 		});

src/compiler/compile/css/Selector.ts

@@ -118,8 +118,8 @@ export default class Selector {
 				const selector = block.selectors[i];
 				if (selector.type === 'PseudoClassSelector' && selector.name === 'global') {
 					component.error(selector, {
-						code: `css-invalid-global`,
+						code: 'css-invalid-global',
-						message: `:global(...) must be the first element in a compound selector`
+						message: ':global(...) must be the first element in a compound selector'
 					});
 				}
 			}
@@ -139,8 +139,8 @@ export default class Selector {
 		for (let i = start; i < end; i += 1) {
 			if (this.blocks[i].global) {
 				component.error(this.blocks[i].selectors[0], {
-					code: `css-invalid-global`,
+					code: 'css-invalid-global',
-					message: `:global(...) can be at the start or end of a selector sequence, but not in the middle`
+					message: ':global(...) can be at the start or end of a selector sequence, but not in the middle'
 				});
 			}
 		}
@@ -286,7 +286,7 @@ function test_attribute(operator, expected_value, case_insensitive, value) {
 		case '^=': return value.startsWith(expected_value);
 		case '$=': return value.endsWith(expected_value);
 		case '*=': return value.includes(expected_value);
-		default: throw new Error(`this shouldn't happen`);
+		default: throw new Error("this shouldn't happen");
 	}
 }
 

src/compiler/compile/css/Stylesheet.ts

@@ -5,7 +5,7 @@ import Element from '../nodes/Element';
 import { Ast } from '../../interfaces';
 import Component from '../Component';
 import { CssNode } from './interfaces';
-import hash from "../utils/hash";
+import hash from '../utils/hash';
 
 function remove_css_prefix(name: string): string {
 	return name.replace(/^-((webkit)|(moz)|(o)|(ms))-/, '');
@@ -428,7 +428,7 @@ export default class Stylesheet {
 		this.children.forEach(child => {
 			child.warn_on_unused_selector((selector: Selector) => {
 				component.warn(selector.node, {
-					code: `css-unused-selector`,
+					code: 'css-unused-selector',
 					message: `Unused CSS selector "${this.source.slice(selector.node.start, selector.node.end)}"`
 				});
 			});

src/compiler/compile/index.ts

@@ -46,9 +46,9 @@ function validate_options(options: CompileOptions, warnings: Warning[]) {
 	}
 
 	if (name && /^[a-z]/.test(name)) {
-		const message = `options.name should be capitalised`;
+		const message = 'options.name should be capitalised';
 		warnings.push({
-			code: `options-lowercase-name`,
+			code: 'options-lowercase-name',
 			message,
 			filename,
 			toString: () => message
@@ -58,7 +58,7 @@ function validate_options(options: CompileOptions, warnings: Warning[]) {
 	if (loopGuardTimeout && !dev) {
 		const message = 'options.loopGuardTimeout is for options.dev = true only';
 		warnings.push({
-			code: `options-loop-guard-timeout`,
+			code: 'options-loop-guard-timeout',
 			message,
 			filename,
 			toString: () => message

src/compiler/compile/nodes/Animation.ts

@@ -17,8 +17,8 @@ export default class Animation extends Node {
 
 		if (parent.animation) {
 			component.error(this, {
-				code: `duplicate-animation`,
+				code: 'duplicate-animation',
-				message: `An element can only have one 'animate' directive`
+				message: "An element can only have one 'animate' directive"
 			});
 		}
 
@@ -26,8 +26,8 @@ export default class Animation extends Node {
 		if (!block || block.type !== 'EachBlock' || !block.key) {
 			// TODO can we relax the 'immediate child' rule?
 			component.error(this, {
-				code: `invalid-animation`,
+				code: 'invalid-animation',
-				message: `An element that use the animate directive must be the immediate child of a keyed each block`
+				message: 'An element that use the animate directive must be the immediate child of a keyed each block'
 			});
 		}
 

src/compiler/compile/nodes/Binding.ts

@@ -3,7 +3,7 @@ import get_object from '../utils/get_object';
 import Expression from './shared/Expression';
 import Component from '../Component';
 import TemplateScope from './shared/TemplateScope';
-import {dimensions} from "../../utils/patterns";
+import {dimensions} from '../../utils/patterns';
 import { Node as ESTreeNode } from 'estree';
 
 // TODO this should live in a specific binding

src/compiler/compile/nodes/EachBlock.ts

@@ -60,8 +60,8 @@ export default class EachBlock extends AbstractBlock {
 			if (this.children.length !== 1) {
 				const child = this.children.find(child => !!(child as Element).animation);
 				component.error((child as Element).animation, {
-					code: `invalid-animation`,
+					code: 'invalid-animation',
-					message: `An element that use the animate directive must be the sole child of a keyed each block`
+					message: 'An element that use the animate directive must be the sole child of a keyed each block'
 				});
 			}
 		}

src/compiler/compile/nodes/Element.ts

@@ -63,14 +63,14 @@ const a11y_no_onchange = new Set([
 ]);
 
 const a11y_labelable = new Set([
-	"button",
+	'button',
-	"input",
+	'input',
-	"keygen",
+	'keygen',
-	"meter",
+	'meter',
-	"output",
+	'output',
-	"progress",
+	'progress',
-	"select",
+	'select',
-	"textarea"
+	'textarea'
 ]);
 
 const invisible_elements = new Set(['meta', 'html', 'script', 'style']);
@@ -136,8 +136,8 @@ export default class Element extends Node {
 				const value_attribute = info.attributes.find(node => node.name === 'value');
 				if (value_attribute) {
 					component.error(value_attribute, {
-						code: `textarea-duplicate-value`,
+						code: 'textarea-duplicate-value',
-						message: `A <textarea> can have either a value attribute or (equivalently) child content, but not both`
+						message: 'A <textarea> can have either a value attribute or (equivalently) child content, but not both'
 					});
 				}
 
@@ -251,7 +251,7 @@ export default class Element extends Node {
 		if (a11y_distracting_elements.has(this.name)) {
 			// no-distracting-elements
 			this.component.warn(this, {
-				code: `a11y-distracting-elements`,
+				code: 'a11y-distracting-elements',
 				message: `A11y: Avoid <${this.name}> elements`
 			});
 		}
@@ -273,8 +273,8 @@ export default class Element extends Node {
 
 			if (!is_figure_parent) {
 				this.component.warn(this, {
-					code: `a11y-structure`,
+					code: 'a11y-structure',
-					message: `A11y: <figcaption> must be an immediate child of <figure>`
+					message: 'A11y: <figcaption> must be an immediate child of <figure>'
 				});
 			}
 		}
@@ -290,8 +290,8 @@ export default class Element extends Node {
 
 			if (index !== -1 && (index !== 0 && index !== children.length - 1)) {
 				this.component.warn(children[index], {
-					code: `a11y-structure`,
+					code: 'a11y-structure',
-					message: `A11y: <figcaption> must be first or last child of <figure>`
+					message: 'A11y: <figcaption> must be first or last child of <figure>'
 				});
 			}
 		}
@@ -318,7 +318,7 @@ export default class Element extends Node {
 				if (invisible_elements.has(this.name)) {
 					// aria-unsupported-elements
 					component.warn(attribute, {
-						code: `a11y-aria-attributes`,
+						code: 'a11y-aria-attributes',
 						message: `A11y: <${this.name}> should not have aria-* attributes`
 					});
 				}
@@ -330,14 +330,14 @@ export default class Element extends Node {
 					if (match) message += ` (did you mean '${match}'?)`;
 
 					component.warn(attribute, {
-						code: `a11y-unknown-aria-attribute`,
+						code: 'a11y-unknown-aria-attribute',
 						message
 					});
 				}
 
 				if (name === 'aria-hidden' && /^h[1-6]$/.test(this.name)) {
 					component.warn(attribute, {
-						code: `a11y-hidden`,
+						code: 'a11y-hidden',
 						message: `A11y: <${this.name}> element should not be hidden`
 					});
 				}
@@ -348,7 +348,7 @@ export default class Element extends Node {
 				if (invisible_elements.has(this.name)) {
 					// aria-unsupported-elements
 					component.warn(attribute, {
-						code: `a11y-misplaced-role`,
+						code: 'a11y-misplaced-role',
 						message: `A11y: <${this.name}> should not have role attribute`
 					});
 				}
@@ -362,7 +362,7 @@ export default class Element extends Node {
 					if (match) message += ` (did you mean '${match}'?)`;
 
 					component.warn(attribute, {
-						code: `a11y-unknown-role`,
+						code: 'a11y-unknown-role',
 						message
 					});
 				}
@@ -371,24 +371,24 @@ export default class Element extends Node {
 			// no-access-key
 			if (name === 'accesskey') {
 				component.warn(attribute, {
-					code: `a11y-accesskey`,
+					code: 'a11y-accesskey',
-					message: `A11y: Avoid using accesskey`
+					message: 'A11y: Avoid using accesskey'
 				});
 			}
 
 			// no-autofocus
 			if (name === 'autofocus') {
 				component.warn(attribute, {
-					code: `a11y-autofocus`,
+					code: 'a11y-autofocus',
-					message: `A11y: Avoid using autofocus`
+					message: 'A11y: Avoid using autofocus'
 				});
 			}
 
 			// scope
 			if (name === 'scope' && this.name !== 'th') {
 				component.warn(attribute, {
-					code: `a11y-misplaced-scope`,
+					code: 'a11y-misplaced-scope',
-					message: `A11y: The scope attribute should only be used with <th> elements`
+					message: 'A11y: The scope attribute should only be used with <th> elements'
 				});
 			}
 
@@ -398,8 +398,8 @@ export default class Element extends Node {
 				// @ts-ignore todo is tabindex=true correct case?
 				if (!isNaN(value) && +value > 0) {
 					component.warn(attribute, {
-						code: `a11y-positive-tabindex`,
+						code: 'a11y-positive-tabindex',
-						message: `A11y: avoid tabindex values above zero`
+						message: 'A11y: avoid tabindex values above zero'
 					});
 				}
 			}
@@ -407,7 +407,7 @@ export default class Element extends Node {
 
 			if (/(^[0-9-.])|[\^$@%&#?!|()[\]{}^*+~;]/.test(name)) {
 				component.error(attribute, {
-					code: `illegal-attribute`,
+					code: 'illegal-attribute',
 					message: `'${name}' is not a valid attribute name`
 				});
 			}
@@ -415,14 +415,14 @@ export default class Element extends Node {
 			if (name === 'slot') {
 				if (!attribute.is_static) {
 					component.error(attribute, {
-						code: `invalid-slot-attribute`,
+						code: 'invalid-slot-attribute',
-						message: `slot attribute cannot have a dynamic value`
+						message: 'slot attribute cannot have a dynamic value'
 					});
 				}
 
 				if (component.slot_outlets.has(name)) {
 					component.error(attribute, {
-						code: `duplicate-slot-attribute`,
+						code: 'duplicate-slot-attribute',
 						message: `Duplicate '${name}' slot`
 					});
 
@@ -431,8 +431,8 @@ export default class Element extends Node {
 
 				if (!(parent.type === 'InlineComponent' || within_custom_element(parent))) {
 					component.error(attribute, {
-						code: `invalid-slotted-content`,
+						code: 'invalid-slotted-content',
-						message: `Element with a slot='...' attribute must be a child of a component or a descendant of a custom element`
+						message: 'Element with a slot=\'...\' attribute must be a child of a component or a descendant of a custom element'
 					});
 				}
 			}
@@ -440,7 +440,7 @@ export default class Element extends Node {
 			if (name === 'is') {
 				component.warn(attribute, {
 					code: 'avoid-is',
-					message: `The 'is' attribute is not supported cross-browser and should be avoided`
+					message: 'The \'is\' attribute is not supported cross-browser and should be avoided'
 				});
 			}
 
@@ -471,7 +471,7 @@ export default class Element extends Node {
 
 				if (href_value === '' || href_value === '#' || /^\W*javascript:/i.test(href_value)) {
 					component.warn(href_attribute, {
-						code: `a11y-invalid-attribute`,
+						code: 'a11y-invalid-attribute',
 						message: `A11y: '${href_value}' is not a valid ${href_attribute.name} attribute`
 					});
 				}
@@ -481,8 +481,8 @@ export default class Element extends Node {
 
 				if (!id_attribute_valid && !name_attribute_valid) {
 					component.warn(this, {
-						code: `a11y-missing-attribute`,
+						code: 'a11y-missing-attribute',
-						message: `A11y: <a> element should have an href attribute`
+						message: 'A11y: <a> element should have an href attribute'
 					});
 				}
 			}
@@ -520,8 +520,8 @@ export default class Element extends Node {
 
 				if (/\b(image|picture|photo)\b/i.test(alt_value)) {
 					component.warn(this, {
-						code: `a11y-img-redundant-alt`,
+						code: 'a11y-img-redundant-alt',
-						message: `A11y: Screenreaders already announce <img> elements as an image.`
+						message: 'A11y: Screenreaders already announce <img> elements as an image.'
 					});
 				}
 			}
@@ -531,8 +531,8 @@ export default class Element extends Node {
 			const has_input_child = this.children.some(i => (i instanceof Element && a11y_labelable.has(i.name) ));
 			if (!attribute_map.has('for') && !has_input_child) {
 				component.warn(this, {
-					code: `a11y-label-has-associated-control`,
+					code: 'a11y-label-has-associated-control',
-					message: `A11y: A form label must be associated with a control.`
+					message: 'A11y: A form label must be associated with a control.'
 				});
 			}
 		}
@@ -550,8 +550,8 @@ export default class Element extends Node {
 
 			if (!has_caption) {
 				component.warn(this, {
-					code: `a11y-media-has-caption`,
+					code: 'a11y-media-has-caption',
-					message: `A11y: Media elements must have a <track kind="captions">`
+					message: 'A11y: Media elements must have a <track kind="captions">'
 				});
 			}
 		}
@@ -559,8 +559,8 @@ export default class Element extends Node {
 		if (a11y_no_onchange.has(this.name)) {
 			if (handlers_map.has('change') && !handlers_map.has('blur')) {
 				component.warn(this, {
-					code: `a11y-no-onchange`,
+					code: 'a11y-no-onchange',
-					message: `A11y: on:blur must be used instead of on:change, unless absolutely necessary and it causes no negative consequences for keyboard only or screen reader users.`
+					message: 'A11y: on:blur must be used instead of on:change, unless absolutely necessary and it causes no negative consequences for keyboard only or screen reader users.'
 				});
 			}
 		}
@@ -578,8 +578,8 @@ export default class Element extends Node {
 
 			if (!attribute.is_static) {
 				component.error(attribute, {
-					code: `invalid-type`,
+					code: 'invalid-type',
-					message: `'type' attribute cannot be dynamic if input uses two-way binding`
+					message: '\'type\' attribute cannot be dynamic if input uses two-way binding'
 				});
 			}
 
@@ -587,8 +587,8 @@ export default class Element extends Node {
 
 			if (value === true) {
 				component.error(attribute, {
-					code: `missing-type`,
+					code: 'missing-type',
-					message: `'type' attribute must be specified`
+					message: '\'type\' attribute must be specified'
 				});
 			}
 
@@ -605,7 +605,7 @@ export default class Element extends Node {
 					this.name !== 'select'
 				) {
 					component.error(binding, {
-						code: `invalid-binding`,
+						code: 'invalid-binding',
 						message: `'value' is not a valid binding on <${this.name}> elements`
 					});
 				}
@@ -617,8 +617,8 @@ export default class Element extends Node {
 
 					if (attribute && !attribute.is_static) {
 						component.error(attribute, {
-							code: `dynamic-multiple-attribute`,
+							code: 'dynamic-multiple-attribute',
-							message: `'multiple' attribute cannot be dynamic if select uses two-way binding`
+							message: '\'multiple\' attribute cannot be dynamic if select uses two-way binding'
 						});
 					}
 				} else {
@@ -627,7 +627,7 @@ export default class Element extends Node {
 			} else if (name === 'checked' || name === 'indeterminate') {
 				if (this.name !== 'input') {
 					component.error(binding, {
-						code: `invalid-binding`,
+						code: 'invalid-binding',
 						message: `'${name}' is not a valid binding on <${this.name}> elements`
 					});
 				}
@@ -636,13 +636,13 @@ export default class Element extends Node {
 
 				if (type !== 'checkbox') {
 					let message = `'${name}' binding can only be used with <input type="checkbox">`;
-					if (type === 'radio') message += ` — for <input type="radio">, use 'group' binding`;
+					if (type === 'radio') message += ' — for <input type="radio">, use \'group\' binding';
-					component.error(binding, { code: `invalid-binding`, message });
+					component.error(binding, { code: 'invalid-binding', message });
 				}
 			} else if (name === 'group') {
 				if (this.name !== 'input') {
 					component.error(binding, {
-						code: `invalid-binding`,
+						code: 'invalid-binding',
 						message: `'group' is not a valid binding on <${this.name}> elements`
 					});
 				}
@@ -651,14 +651,14 @@ export default class Element extends Node {
 
 				if (type !== 'checkbox' && type !== 'radio') {
 					component.error(binding, {
-						code: `invalid-binding`,
+						code: 'invalid-binding',
-						message: `'group' binding can only be used with <input type="checkbox"> or <input type="radio">`
+						message: '\'group\' binding can only be used with <input type="checkbox"> or <input type="radio">'
 					});
 				}
 			} else if (name === 'files') {
 				if (this.name !== 'input') {
 					component.error(binding, {
-						code: `invalid-binding`,
+						code: 'invalid-binding',
 						message: `'files' is not a valid binding on <${this.name}> elements`
 					});
 				}
@@ -667,15 +667,15 @@ export default class Element extends Node {
 
 				if (type !== 'file') {
 					component.error(binding, {
-						code: `invalid-binding`,
+						code: 'invalid-binding',
-						message: `'files' binding can only be used with <input type="file">`
+						message: '\'files\' binding can only be used with <input type="file">'
 					});
 				}
 
 			} else if (name === 'open') {
 				if (this.name !== 'details') {
 					component.error(binding, {
-						code: `invalid-binding`,
+						code: 'invalid-binding',
 						message: `'${name}' binding can only be used with <details>`
 					});
 				}
@@ -694,7 +694,7 @@ export default class Element extends Node {
 			) {
 				if (this.name !== 'audio' && this.name !== 'video') {
 					component.error(binding, {
-						code: `invalid-binding`,
+						code: 'invalid-binding',
 						message: `'${name}' binding can only be used with <audio> or <video>`
 					});
 				}
@@ -704,7 +704,7 @@ export default class Element extends Node {
 			) {
 				if (this.name !== 'video') {
 					component.error(binding, {
-						code: `invalid-binding`,
+						code: 'invalid-binding',
 						message: `'${name}' binding can only be used with <video>`
 					});
 				}
@@ -735,18 +735,18 @@ export default class Element extends Node {
 
 				if (!contenteditable) {
 					component.error(binding, {
-						code: `missing-contenteditable-attribute`,
+						code: 'missing-contenteditable-attribute',
-						message: `'contenteditable' attribute is required for textContent and innerHTML two-way bindings`
+						message: '\'contenteditable\' attribute is required for textContent and innerHTML two-way bindings'
 					});
 				} else if (contenteditable && !contenteditable.is_static) {
 					component.error(contenteditable, {
-						code: `dynamic-contenteditable-attribute`,
+						code: 'dynamic-contenteditable-attribute',
-						message: `'contenteditable' attribute cannot be dynamic if element uses two-way binding`
+						message: '\'contenteditable\' attribute cannot be dynamic if element uses two-way binding'
 					});
 				}
 			} else if (name !== 'this') {
 				component.error(binding, {
-					code: `invalid-binding`,
+					code: 'invalid-binding',
 					message: `'${binding.name}' is not a valid binding`
 				});
 			}
@@ -762,7 +762,7 @@ export default class Element extends Node {
 
 		if (this.children.length === 0) {
 			this.component.warn(this, {
-				code: `a11y-missing-content`,
+				code: 'a11y-missing-content',
 				message: `A11y: <${this.name}> element should have child content`
 			});
 		}
@@ -775,14 +775,14 @@ export default class Element extends Node {
 			if (handler.modifiers.has('passive') && handler.modifiers.has('preventDefault')) {
 				component.error(handler, {
 					code: 'invalid-event-modifier',
-					message: `The 'passive' and 'preventDefault' modifiers cannot be used together`
+					message: 'The \'passive\' and \'preventDefault\' modifiers cannot be used together'
 				});
 			}
 
 			if (handler.modifiers.has('passive') && handler.modifiers.has('nonpassive')) {
 				component.error(handler, {
 					code: 'invalid-event-modifier',
-					message: `The 'passive' and 'nonpassive' modifiers cannot be used together`
+					message: 'The \'passive\' and \'nonpassive\' modifiers cannot be used together'
 				});
 			}
 
@@ -799,13 +799,13 @@ export default class Element extends Node {
 						if (handler.can_make_passive) {
 							component.warn(handler, {
 								code: 'redundant-event-modifier',
-								message: `Touch event handlers that don't use the 'event' object are passive by default`
+								message: 'Touch event handlers that don\'t use the \'event\' object are passive by default'
 							});
 						}
 					} else {
 						component.warn(handler, {
 							code: 'redundant-event-modifier',
-							message: `The passive modifier only works with wheel and touch events`
+							message: 'The passive modifier only works with wheel and touch events'
 						});
 					}
 				}
@@ -876,7 +876,7 @@ function should_have_attribute(
 		attributes[0];
 
 	node.component.warn(node, {
-		code: `a11y-missing-attribute`,
+		code: 'a11y-missing-attribute',
 		message: `A11y: <${name}> element should have ${article} ${sequence} attribute`
 	});
 }

src/compiler/compile/nodes/Head.ts

@@ -12,8 +12,8 @@ export default class Head extends Node {
 
 		if (info.attributes.length) {
 			component.error(info.attributes[0], {
-				code: `invalid-attribute`,
+				code: 'invalid-attribute',
-				message: `<svelte:head> should not have any attributes or directives`
+				message: '<svelte:head> should not have any attributes or directives'
 			});
 		}
 

src/compiler/compile/nodes/InlineComponent.ts

@@ -40,15 +40,15 @@ export default class InlineComponent extends Node {
 			switch (node.type) {
 				case 'Action':
 					component.error(node, {
-						code: `invalid-action`,
+						code: 'invalid-action',
-						message: `Actions can only be applied to DOM elements, not components`
+						message: 'Actions can only be applied to DOM elements, not components'
 					});
 
 				case 'Attribute':
 					if (node.name === 'slot') {
 						component.error(node, {
-							code: `invalid-prop`,
+							code: 'invalid-prop',
-							message: `'slot' is reserved for future use in named slots`
+							message: "'slot' is reserved for future use in named slots"
 						});
 					}
 					// fallthrough
@@ -62,8 +62,8 @@ export default class InlineComponent extends Node {
 
 				case 'Class':
 					component.error(node, {
-						code: `invalid-class`,
+						code: 'invalid-class',
-						message: `Classes can only be applied to DOM elements, not components`
+						message: 'Classes can only be applied to DOM elements, not components'
 					});
 
 				case 'EventHandler':
@@ -76,8 +76,8 @@ export default class InlineComponent extends Node {
 
 				case 'Transition':
 					component.error(node, {
-						code: `invalid-transition`,
+						code: 'invalid-transition',
-						message: `Transitions can only be applied to DOM elements, not components`
+						message: 'Transitions can only be applied to DOM elements, not components'
 					});
 
 				default:
@@ -105,7 +105,7 @@ export default class InlineComponent extends Node {
 				if (modifier !== 'once') {
 					component.error(handler, {
 						code: 'invalid-event-modifier',
-						message: `Event modifiers other than 'once' can only be used on DOM elements`
+						message: "Event modifiers other than 'once' can only be used on DOM elements"
 					});
 				}
 			});

src/compiler/compile/nodes/KeyBlock.ts

@@ -1,9 +1,9 @@
-import Expression from "./shared/Expression";
+import Expression from './shared/Expression';
-import map_children from "./shared/map_children";
+import map_children from './shared/map_children';
-import AbstractBlock from "./shared/AbstractBlock";
+import AbstractBlock from './shared/AbstractBlock';
 
 export default class KeyBlock extends AbstractBlock {
-	type: "KeyBlock";
+	type: 'KeyBlock';
 
 	expression: Expression;
 

src/compiler/compile/nodes/Let.ts

@@ -26,7 +26,7 @@ export default class Let extends Node {
 					if (!applicable.has(node.type)) {
 						component.error(node as any, {
 							code: 'invalid-let',
-							message: `let directive value must be an identifier or an object/array pattern`
+							message: 'let directive value must be an identifier or an object/array pattern'
 						});
 					}
 

src/compiler/compile/nodes/Slot.ts

@@ -17,24 +17,24 @@ export default class Slot extends Element {
 		info.attributes.forEach(attr => {
 			if (attr.type !== 'Attribute') {
 				component.error(attr, {
-					code: `invalid-slot-directive`,
+					code: 'invalid-slot-directive',
-					message: `<slot> cannot have directives`
+					message: '<slot> cannot have directives'
 				});
 			}
 
 			if (attr.name === 'name') {
 				if (attr.value.length !== 1 || attr.value[0].type !== 'Text') {
 					component.error(attr, {
-						code: `dynamic-slot-name`,
+						code: 'dynamic-slot-name',
-						message: `<slot> name cannot be dynamic`
+						message: '<slot> name cannot be dynamic'
 					});
 				}
 
 				this.slot_name = attr.value[0].data;
 				if (this.slot_name === 'default') {
 					component.error(attr, {
-						code: `invalid-slot-name`,
+						code: 'invalid-slot-name',
-						message: `default is a reserved word — it cannot be used as a slot name`
+						message: 'default is a reserved word — it cannot be used as a slot name'
 					});
 				}
 			}

src/compiler/compile/nodes/Text.ts

@@ -37,7 +37,7 @@ export default class Text extends Node {
 
 		// svg namespace exclusions
 		if (/svg$/.test(parent_element.namespace)) {
-			if (this.prev && this.prev.type === "Element" && this.prev.name === "tspan") return false;
+			if (this.prev && this.prev.type === 'Element' && this.prev.name === 'tspan') return false;
 		}
 
 		return parent_element.namespace || elements_without_text.has(parent_element.name);

src/compiler/compile/nodes/Title.ts

@@ -13,8 +13,8 @@ export default class Title extends Node {
 
 		if (info.attributes.length > 0) {
 			component.error(info.attributes[0], {
-				code: `illegal-attribute`,
+				code: 'illegal-attribute',
-				message: `<title> cannot have attributes`
+				message: '<title> cannot have attributes'
 			});
 		}
 
@@ -22,7 +22,7 @@ export default class Title extends Node {
 			if (child.type !== 'Text' && child.type !== 'MustacheTag') {
 				component.error(child, {
 					code: 'illegal-structure',
-					message: `<title> can only contain text and {tags}`
+					message: '<title> can only contain text and {tags}'
 				});
 			}
 		});

src/compiler/compile/nodes/Transition.ts

@@ -28,7 +28,7 @@ export default class Transition extends Node {
 				: `An element cannot have both ${describe(parent_transition)} directive and ${describe(this)} directive`;
 
 			component.error(info, {
-				code: `duplicate-transition`,
+				code: 'duplicate-transition',
 				message
 			});
 		}
@@ -41,6 +41,6 @@ export default class Transition extends Node {
 
 function describe(transition: Transition) {
 	return transition.directive === 'transition'
-		? `a 'transition'`
+		? "a 'transition'"
 		: `an '${transition.directive}'`;
 }

src/compiler/compile/nodes/Window.ts

@@ -36,7 +36,7 @@ export default class Window extends Node {
 
 					// TODO is this constraint necessary?
 					component.error(node.expression, {
-						code: `invalid-binding`,
+						code: 'invalid-binding',
 						message: `Bindings on <svelte:window> must be to top-level properties, e.g. '${parts[parts.length - 1]}' rather than '${parts.join('.')}'`
 					});
 				}
@@ -52,12 +52,12 @@ export default class Window extends Node {
 
 					if (match) {
 						component.error(node, {
-							code: `invalid-binding`,
+							code: 'invalid-binding',
 							message: `${message} (did you mean '${match}'?)`
 						});
 					} else {
 						component.error(node, {
-							code: `invalid-binding`,
+							code: 'invalid-binding',
 							message: `${message} — valid bindings are ${list(valid_bindings)}`
 						});
 					}

src/compiler/compile/nodes/shared/Expression.ts

@@ -85,8 +85,8 @@ export default class Expression {
 						const store_name = name.slice(1);
 						if (template_scope.names.has(store_name) || scope.has(store_name)) {
 							component.error(node, {
-								code: `contextual-store`,
+								code: 'contextual-store',
-								message: `Stores must be declared at the top level of the component (this may change in a future version of Svelte)`
+								message: 'Stores must be declared at the top level of the component (this may change in a future version of Svelte)'
 							});
 						}
 					}

src/compiler/compile/render_dom/Renderer.ts

@@ -235,7 +235,7 @@ export default class Renderer {
 				if (!member) return;
 
 				if (member.index.value === -1) {
-					throw new Error(`unset index`);
+					throw new Error('unset index');
 				}
 
 				const value = member.index.value as number;

src/compiler/compile/render_dom/index.ts

@@ -81,7 +81,7 @@ export default function dom(
 
 	const uses_props = component.var_lookup.has('$$props');
 	const uses_rest = component.var_lookup.has('$$restProps');
-	const $$props = uses_props || uses_rest ? `$$new_props` : `$$props`;
+	const $$props = uses_props || uses_rest ? '$$new_props' : '$$props';
 	const props = component.vars.filter(variable => !variable.module && variable.export_name);
 	const writable_props = props.filter(variable => variable.writable);
 
@@ -524,7 +524,7 @@ export default function dom(
 		const declaration = b`
 			class ${name} extends ${superclass} {
 				constructor(options) {
-					super(${options.dev && `options`});
+					super(${options.dev && 'options'});
 					${should_add_css && b`if (!@_document.getElementById("${component.stylesheet.id}-style")) ${add_css}();`}
 					@init(this, options, ${definition}, ${has_create_fragment ? 'create_fragment': 'null'}, ${not_equal}, ${prop_indexes}, ${dirty});
 					${options.dev && b`@dispatch_dev("SvelteRegisterComponent", { component: this, tagName: "${name.name}", options, id: create_fragment.name });`}

src/compiler/compile/render_dom/wrappers/AwaitBlock.ts

@@ -177,8 +177,8 @@ export default class AwaitBlockWrapper extends Wrapper {
 
 		const snippet = this.node.expression.manipulate(block);
 
-		const info = block.get_unique_name(`info`);
+		const info = block.get_unique_name('info');
-		const promise = block.get_unique_name(`promise`);
+		const promise = block.get_unique_name('promise');
 
 		block.add_variable(promise);
 

src/compiler/compile/render_dom/wrappers/EachBlock.ts

@@ -29,7 +29,7 @@ export class ElseBlockWrapper extends Wrapper {
 
 		this.block = block.child({
 			comment: create_debugging_comment(node, this.renderer.component),
-			name: this.renderer.component.get_unique_name(`create_else_block`),
+			name: this.renderer.component.get_unique_name('create_else_block'),
 			type: 'else'
 		});
 
@@ -441,11 +441,11 @@ export default class EachBlockWrapper extends Wrapper {
 
 		const destroy = this.node.has_animation
 			? (this.block.has_outros
-				? `@fix_and_outro_and_destroy_block`
+				? '@fix_and_outro_and_destroy_block'
-				: `@fix_and_destroy_block`)
+				: '@fix_and_destroy_block')
 			: this.block.has_outros
-				? `@outro_and_destroy_block`
+				? '@outro_and_destroy_block'
-				: `@destroy_block`;
+				: '@destroy_block';
 
 		if (this.dependencies.size) {
 			this.updates.push(b`
@@ -563,7 +563,7 @@ export default class EachBlockWrapper extends Wrapper {
 						}
 					`;
 
-			const start = this.block.has_update_method ? 0 : `#old_length`;
+			const start = this.block.has_update_method ? 0 : '#old_length';
 
 			let remove_old_blocks;
 

src/compiler/compile/render_dom/wrappers/Element/Attribute.ts

@@ -187,7 +187,7 @@ export default class AttributeWrapper extends BaseAttributeWrapper {
 		if (this.is_input_value) {
 			const type = element.node.get_static_attribute_value('type');
 
-			if (type === null || type === "" || type === "text" || type === "email" || type === "password") {
+			if (type === null || type === '' || type === 'text' || type === 'email' || type === 'password') {
 				condition = x`${condition} && ${element.var}.${property_name} !== ${should_cache ? last : value}`;
 			}
 		}
@@ -277,7 +277,7 @@ export default class AttributeWrapper extends BaseAttributeWrapper {
 		if (this.node.is_true) return '';
 
 		const value = this.node.chunks;
-		if (value.length === 0) return `=""`;
+		if (value.length === 0) return '=""';
 
 		return `="${value.map(chunk => {
 			return chunk.type === 'Text'

src/compiler/compile/render_dom/wrappers/Element/Binding.ts

@@ -88,20 +88,20 @@ export default class BindingWrapper {
 			update_conditions.push(block.renderer.dirty(dependency_array));
 		}
 
-		if (parent.node.name === "input") {
+		if (parent.node.name === 'input') {
-			const type = parent.node.get_static_attribute_value("type");
+			const type = parent.node.get_static_attribute_value('type');
 
 			if (
 				type === null ||
-				type === "" ||
+				type === '' ||
-				type === "text" ||
+				type === 'text' ||
-				type === "email" ||
+				type === 'email' ||
-				type === "password"
+				type === 'password'
 			) {
 				update_conditions.push(
 					x`${parent.var}.${this.node.name} !== ${this.snippet}`
 				);
-			} else if (type === "number") {
+			} else if (type === 'number') {
 				update_conditions.push(
 					x`@to_number(${parent.var}.${this.node.name}) !== ${this.snippet}`
 				);
@@ -118,7 +118,7 @@ export default class BindingWrapper {
 			{
 				const { binding_group, is_context, contexts, index } = get_binding_group(parent.renderer, this.node, block);
 
-				block.renderer.add_to_context(`$$binding_groups`);
+				block.renderer.add_to_context('$$binding_groups');
 
 				if (is_context) {
 					if (contexts.length > 1) {

src/compiler/compile/render_dom/wrappers/Element/SpreadAttribute.ts

@@ -1,3 +1,3 @@
-import { BaseAttributeWrapper } from "./Attribute";
+import { BaseAttributeWrapper } from './Attribute';
 
 export default class SpreadAttributeWrapper extends BaseAttributeWrapper {}

src/compiler/compile/render_dom/wrappers/Element/handle_select_value_binding.ts

@@ -1,13 +1,13 @@
-import AttributeWrapper from "./Attribute";
+import AttributeWrapper from './Attribute';
-import BindingWrapper from "./Binding";
+import BindingWrapper from './Binding';
-import ElementWrapper from "./index";
+import ElementWrapper from './index';
 
 export default function handle_select_value_binding(
 	attr: AttributeWrapper | BindingWrapper,
 	dependencies: Set<string>
 ) {
 	const { parent } = attr;
-	if (parent.node.name === "select") {
+	if (parent.node.name === 'select') {
 		(parent as ElementWrapper).select_binding_dependencies = dependencies;
 		dependencies.forEach((prop: string) => {
 			parent.renderer.component.indirect_dependencies.set(prop, new Set());

src/compiler/compile/render_dom/wrappers/Element/index.ts

@@ -685,7 +685,7 @@ export default class ElementWrapper extends Wrapper {
 			`);
 		} else if (this.node.name === 'input' && this.attributes.find(attr => attr.node.name === 'value')) {
 			const type = this.node.get_static_attribute_value('type');
-			if (type === null || type === "" || type === "text" || type === "email" || type === "password") {
+			if (type === null || type === '' || type === 'text' || type === 'email' || type === 'password') {
 				block.chunks.mount.push(b`
 					${this.var}.value = ${data}.value;
 				`);
@@ -956,7 +956,7 @@ function to_html(wrappers: Array<ElementWrapper | TextWrapper | MustacheTagWrapp
 					}
 				});
 
-				state.quasi.value.raw += `"`;
+				state.quasi.value.raw += '"';
 			});
 
 			if (!wrapper.void) {

src/compiler/compile/render_dom/wrappers/Fragment.ts

@@ -69,7 +69,7 @@ export default class FragmentWrapper {
 			const child = nodes[i];
 
 			if (!child.type) {
-				throw new Error(`missing type`);
+				throw new Error('missing type');
 			}
 
 			if (!(child.type in wrappers)) {

src/compiler/compile/render_dom/wrappers/IfBlock.ts

@@ -55,7 +55,7 @@ class IfBlockBranch extends Wrapper {
 			});
 
 			if (should_cache) {
-				this.condition = block.get_unique_name(`show_if`);
+				this.condition = block.get_unique_name('show_if');
 				this.snippet = (expression.manipulate(block) as Node);
 			} else {
 				this.condition = expression.manipulate(block);
@@ -65,7 +65,7 @@ class IfBlockBranch extends Wrapper {
 		this.block = block.child({
 			comment: create_debugging_comment(node, parent.renderer.component),
 			name: parent.renderer.component.get_unique_name(
-				is_else ? `create_else_block` : `create_if_block`
+				is_else ? 'create_else_block' : 'create_if_block'
 			),
 			type: (node as IfBlock).expression ? 'if' : 'else'
 		});
@@ -257,8 +257,8 @@ export default class IfBlockWrapper extends Wrapper {
 		{ name, anchor, has_else, if_exists_condition, has_transitions },
 		detaching
 	) {
-		const select_block_type = this.renderer.component.get_unique_name(`select_block_type`);
+		const select_block_type = this.renderer.component.get_unique_name('select_block_type');
-		const current_block_type = block.get_unique_name(`current_block_type`);
+		const current_block_type = block.get_unique_name('current_block_type');
 		const get_block = has_else
 			? x`${current_block_type}(#ctx)`
 			: x`${current_block_type} && ${current_block_type}(#ctx)`;
@@ -364,11 +364,11 @@ export default class IfBlockWrapper extends Wrapper {
 		{ name, anchor, has_else, has_transitions, if_exists_condition },
 		detaching
 	) {
-		const select_block_type = this.renderer.component.get_unique_name(`select_block_type`);
+		const select_block_type = this.renderer.component.get_unique_name('select_block_type');
-		const current_block_type_index = block.get_unique_name(`current_block_type_index`);
+		const current_block_type_index = block.get_unique_name('current_block_type_index');
-		const previous_block_index = block.get_unique_name(`previous_block_index`);
+		const previous_block_index = block.get_unique_name('previous_block_index');
-		const if_block_creators = block.get_unique_name(`if_block_creators`);
+		const if_block_creators = block.get_unique_name('if_block_creators');
-		const if_blocks = block.get_unique_name(`if_blocks`);
+		const if_blocks = block.get_unique_name('if_blocks');
 
 		const if_current_block_type_index = has_else
 			? nodes => nodes

src/compiler/compile/render_dom/wrappers/InlineComponent/index.ts

@@ -78,7 +78,7 @@ export default class InlineComponentWrapper extends Wrapper {
 
 			const default_slot = block.child({
 				comment: create_debugging_comment(node, renderer.component),
-				name: renderer.component.get_unique_name(`create_default_slot`),
+				name: renderer.component.get_unique_name('create_default_slot'),
 				type: 'slot'
 			});
 

src/compiler/compile/render_dom/wrappers/KeyBlock.ts

@@ -1,19 +1,19 @@
-import Wrapper from "./shared/Wrapper";
+import Wrapper from './shared/Wrapper';
-import Renderer from "../Renderer";
+import Renderer from '../Renderer';
-import Block from "../Block";
+import Block from '../Block';
-import EachBlock from "../../nodes/EachBlock";
+import EachBlock from '../../nodes/EachBlock';
-import KeyBlock from "../../nodes/KeyBlock";
+import KeyBlock from '../../nodes/KeyBlock';
-import create_debugging_comment from "./shared/create_debugging_comment";
+import create_debugging_comment from './shared/create_debugging_comment';
-import FragmentWrapper from "./Fragment";
+import FragmentWrapper from './Fragment';
-import { b, x } from "code-red";
+import { b, x } from 'code-red';
-import { Identifier } from "estree";
+import { Identifier } from 'estree';
 
 export default class KeyBlockWrapper extends Wrapper {
 	node: KeyBlock;
 	fragment: FragmentWrapper;
 	block: Block;
 	dependencies: string[];
-	var: Identifier = { type: "Identifier", name: "key_block" };
+	var: Identifier = { type: 'Identifier', name: 'key_block' };
 
 	constructor(
 		renderer: Renderer,
@@ -33,8 +33,8 @@ export default class KeyBlockWrapper extends Wrapper {
 		if (this.dependencies.length) {
 			block = block.child({
 				comment: create_debugging_comment(node, renderer.component),
-				name: renderer.component.get_unique_name("create_key_block"),
+				name: renderer.component.get_unique_name('create_key_block'),
-				type: "key"
+				type: 'key'
 			});
 			renderer.blocks.push(block);
 		}
@@ -89,8 +89,8 @@ export default class KeyBlockWrapper extends Wrapper {
 			block.chunks.claim.push(b`${this.var}.l(${parent_nodes});`);
 		}
 		block.chunks.mount.push(
-			b`${this.var}.m(${parent_node || "#target"}, ${
+			b`${this.var}.m(${parent_node || '#target'}, ${
-				parent_node ? "null" : "#anchor"
+				parent_node ? 'null' : '#anchor'
 			});`
 		);
 		const anchor = this.get_or_create_anchor(block, parent_node, parent_nodes);

src/compiler/compile/render_dom/wrappers/Slot.ts

@@ -38,7 +38,7 @@ export default class SlotWrapper extends Wrapper {
 		if (this.node.children.length) {
 			this.fallback = block.child({
 				comment: create_debugging_comment(this.node.children[0], this.renderer.component),
-				name: this.renderer.component.get_unique_name(`fallback_block`),
+				name: this.renderer.component.get_unique_name('fallback_block'),
 				type: 'fallback'
 			});
 			renderer.blocks.push(this.fallback);

src/compiler/compile/render_dom/wrappers/Title.ts

@@ -59,7 +59,7 @@ export default class TitleWrapper extends Wrapper {
 			}
 
 			const last = this.node.should_cache && block.get_unique_name(
-				`title_value`
+				'title_value'
 			);
 
 			if (this.node.should_cache) block.add_variable(last);

src/compiler/compile/render_dom/wrappers/Window.ts

@@ -72,9 +72,9 @@ export default class WindowWrapper extends Wrapper {
 			});
 		});
 
-		const scrolling = block.get_unique_name(`scrolling`);
+		const scrolling = block.get_unique_name('scrolling');
-		const clear_scrolling = block.get_unique_name(`clear_scrolling`);
+		const clear_scrolling = block.get_unique_name('clear_scrolling');
-		const scrolling_timeout = block.get_unique_name(`scrolling_timeout`);
+		const scrolling_timeout = block.get_unique_name('scrolling_timeout');
 
 		Object.keys(events).forEach(event => {
 			const id = block.get_unique_name(`onwindow${event}`);
@@ -156,7 +156,7 @@ export default class WindowWrapper extends Wrapper {
 
 		// another special case. (I'm starting to think these are all special cases.)
 		if (bindings.online) {
-			const id = block.get_unique_name(`onlinestatuschanged`);
+			const id = block.get_unique_name('onlinestatuschanged');
 			const name = bindings.online;
 
 			renderer.add_to_context(id.name);

src/compiler/compile/render_dom/wrappers/shared/mark_each_block_bindings.ts

@@ -1,7 +1,7 @@
-import EachBlock from "../../../nodes/EachBlock";
+import EachBlock from '../../../nodes/EachBlock';
-import InlineComponentWrapper from "../InlineComponent";
+import InlineComponentWrapper from '../InlineComponent';
-import ElementWrapper from "../Element";
+import ElementWrapper from '../Element';
-import Binding from "../../../nodes/Binding";
+import Binding from '../../../nodes/Binding';
 
 export default function mark_each_block_bindings(
 	parent: ElementWrapper | InlineComponentWrapper,
@@ -16,7 +16,7 @@ export default function mark_each_block_bindings(
 		}
 	});
 
-	if (binding.name === "group") {
+	if (binding.name === 'group') {
 		// for `<input bind:group={} >`, we make sure that all the each blocks creates context with `index`
 		for (const name of binding.expression.contextual_dependencies) {
 			const each_block = parent.node.scope.get_owner(name);

src/compiler/compile/render_ssr/handlers/Element.ts

@@ -84,20 +84,20 @@ export default function(node: Element, renderer: Renderer, options: RenderOption
 				attribute.chunks[0].type !== 'Text'
 			) {
 				// a boolean attribute with one non-Text chunk
-				renderer.add_string(` `);
+				renderer.add_string(' ');
 				renderer.add_expression(x`${(attribute.chunks[0] as Expression).node} ? "${attribute.name}" : ""`);
 			} else if (name === 'class' && class_expression) {
 				add_class_attribute = false;
 				renderer.add_string(` ${attribute.name}="`);
 				renderer.add_expression(x`[${get_class_attribute_value(attribute)}, ${class_expression}].join(' ').trim()`);
-				renderer.add_string(`"`);
+				renderer.add_string('"');
 			} else if (attribute.chunks.length === 1 && attribute.chunks[0].type !== 'Text') {
 				const snippet = (attribute.chunks[0] as Expression).node;
 				renderer.add_expression(x`@add_attribute("${attribute.name}", ${snippet}, ${boolean_attributes.has(name) ? 1 : 0})`);
 			} else {
 				renderer.add_string(` ${attribute.name}="`);
 				renderer.add_expression((name === 'class' ? get_class_attribute_value : get_attribute_value)(attribute));
-				renderer.add_string(`"`);
+				renderer.add_string('"');
 			}
 		});
 		if (add_class_attribute) {

src/compiler/compile/render_ssr/handlers/InlineComponent.ts

@@ -104,6 +104,6 @@ function is_empty_template_literal(template_literal) {
 	return (
 		template_literal.expressions.length === 0 &&
 		template_literal.quasis.length === 1 &&
-		template_literal.quasis[0].value.raw === ""
+		template_literal.quasis[0].value.raw === ''
 	);
 }

src/compiler/compile/render_ssr/handlers/Title.ts

@@ -5,11 +5,11 @@ import { x } from 'code-red';
 export default function(node: Title, renderer: Renderer, options: RenderOptions) {
 	renderer.push();
 
-	renderer.add_string(`<title>`);
+	renderer.add_string('<title>');
 
 	renderer.render(node.children, options);
 
-	renderer.add_string(`</title>`);
+	renderer.add_string('</title>');
 	const result = renderer.pop();
 
 	renderer.add_expression(x`$$result.title = ${result}, ""`);

src/compiler/compile/utils/compare_node.ts

@@ -1,13 +1,13 @@
-import { Node, Literal, Identifier, MemberExpression } from "estree";
+import { Node, Literal, Identifier, MemberExpression } from 'estree';
 
 export function compare_node(a: Node | void, b: Node | void) {
 	if (a === b) return true;
 	if (!a || !b) return false;
 	if (a.type !== b.type) return false;
 	switch (a.type) {
-		case "Identifier":
+		case 'Identifier':
 			return a.name === (b as Identifier).name;
-		case "MemberExpression":
+		case 'MemberExpression':
 			return (
 				compare_node(a.object, (b as MemberExpression).object) &&
 				compare_node(a.property, (b as MemberExpression).property) &&

src/compiler/compile/utils/get_name_from_filename.ts

@@ -13,7 +13,7 @@ export default function get_name_from_filename(filename: string) {
 
 	const base = parts.pop()
 		.replace(/%/g, 'u')
-		.replace(/\.[^.]+$/, "")
+		.replace(/\.[^.]+$/, '')
 		.replace(/[^a-zA-Z_$0-9]+/g, '_')
 		.replace(/^_/, '')
 		.replace(/_$/, '')

src/compiler/compile/utils/hash.ts

@@ -1,6 +1,6 @@
 // https://github.com/darkskyapp/string-hash/blob/master/index.js
 export default function hash(str: string): string {
-	str = str.replace(/\r/g, "");
+	str = str.replace(/\r/g, '');
 	let hash = 5381;
 	let i = str.length;
 

src/compiler/compile/utils/reserved_keywords.ts

@@ -1,4 +1,4 @@
-export const reserved_keywords = new Set(["$$props", "$$restProps", "$$slots"]);
+export const reserved_keywords = new Set(['$$props', '$$restProps', '$$slots']);
 
 export function is_reserved_keyword(name) {
 	return reserved_keywords.has(name);

src/compiler/compile/utils/string_to_member_expression.ts

@@ -1,16 +1,16 @@
-import { MemberExpression, Identifier } from "estree";
+import { MemberExpression, Identifier } from 'estree';
 
 export function string_to_member_expression(name: string) {
-	const parts = name.split(".");
+	const parts = name.split('.');
 	let node: MemberExpression | Identifier = {
-		type: "Identifier",
+		type: 'Identifier',
 		name: parts[0]
 	};
 	for (let i = 1; i < parts.length; i++) {
 		node = {
-			type: "MemberExpression",
+			type: 'MemberExpression',
 			object: node,
-			property: { type: "Identifier", name: parts[i] }
+			property: { type: 'Identifier', name: parts[i] }
 		} as MemberExpression;
 	}
 	return node;

src/compiler/interfaces.ts

@@ -1,4 +1,4 @@
-import { Node, Program } from "estree";
+import { Node, Program } from 'estree';
 import { SourceMap } from 'magic-string';
 
 interface BaseNode {

src/compiler/parse/index.ts

@@ -66,7 +66,7 @@ export class Parser {
 
 		if (state !== fragment) {
 			this.error({
-				code: `unexpected-eof`,
+				code: 'unexpected-eof',
 				message: 'Unexpected end of input'
 			});
 		}
@@ -91,7 +91,7 @@ export class Parser {
 
 	acorn_error(err: any) {
 		this.error({
-			code: `parse-error`,
+			code: 'parse-error',
 			message: err.message.replace(/ \(\d+:\d+\)$/, '')
 		}, err.pos);
 	}
@@ -169,7 +169,7 @@ export class Parser {
 
 		if (!allow_reserved && reserved.has(identifier)) {
 			this.error({
-				code: `unexpected-reserved-word`,
+				code: 'unexpected-reserved-word',
 				message: `'${identifier}' is a reserved word in JavaScript and cannot be used here`
 			}, start);
 		}
@@ -180,7 +180,7 @@ export class Parser {
 	read_until(pattern: RegExp) {
 		if (this.index >= this.template.length)
 			this.error({
-				code: `unexpected-eof`,
+				code: 'unexpected-eof',
 				message: 'Unexpected end of input'
 			});
 
@@ -199,8 +199,8 @@ export class Parser {
 	require_whitespace() {
 		if (!whitespace.test(this.template[this.index])) {
 			this.error({
-				code: `missing-whitespace`,
+				code: 'missing-whitespace',
-				message: `Expected whitespace`
+				message: 'Expected whitespace'
 			});
 		}
 
@@ -228,15 +228,15 @@ export default function parse(
 
 	if (instance_scripts.length > 1) {
 		parser.error({
-			code: `invalid-script`,
+			code: 'invalid-script',
-			message: `A component can only have one instance-level <script> element`
+			message: 'A component can only have one instance-level <script> element'
 		}, instance_scripts[1].start);
 	}
 
 	if (module_scripts.length > 1) {
 		parser.error({
-			code: `invalid-script`,
+			code: 'invalid-script',
-			message: `A component can only have one <script context="module"> element`
+			message: 'A component can only have one <script context="module"> element'
 		}, module_scripts[1].start);
 	}
 

src/compiler/parse/read/context.ts

@@ -1,14 +1,14 @@
-import { Parser } from "../index";
+import { Parser } from '../index';
-import { isIdentifierStart } from "acorn";
+import { isIdentifierStart } from 'acorn';
-import full_char_code_at from "../../utils/full_char_code_at";
+import full_char_code_at from '../../utils/full_char_code_at';
 import {
 	is_bracket_open,
 	is_bracket_close,
 	is_bracket_pair,
 	get_bracket_close
-} from "../utils/bracket";
+} from '../utils/bracket';
-import { parse_expression_at } from "../acorn";
+import { parse_expression_at } from '../acorn';
-import { Pattern } from "estree";
+import { Pattern } from 'estree';
 
 export default function read_context(
 	parser: Parser
@@ -19,7 +19,7 @@ export default function read_context(
 	const code = full_char_code_at(parser.template, i);
 	if (isIdentifierStart(code, true)) {
 		return {
-			type: "Identifier",
+			type: 'Identifier',
 			name: parser.read_identifier(),
 			start,
 			end: parser.index
@@ -28,8 +28,8 @@ export default function read_context(
 
 	if (!is_bracket_open(code)) {
 		parser.error({
-			code: "unexpected-token",
+			code: 'unexpected-token',
-			message: "Expected identifier or destructure pattern"
+			message: 'Expected identifier or destructure pattern'
 		});
 	}
 
@@ -43,7 +43,7 @@ export default function read_context(
 		} else if (is_bracket_close(code)) {
 			if (!is_bracket_pair(bracket_stack[bracket_stack.length - 1], code)) {
 				parser.error({
-					code: "unexpected-token",
+					code: 'unexpected-token',
 					message: `Expected ${String.fromCharCode(
 						get_bracket_close(bracket_stack[bracket_stack.length - 1])
 					)}`

src/compiler/parse/read/script.ts

@@ -12,7 +12,7 @@ function get_context(parser: Parser, attributes: any[], start: number): string {
 	if (context.value.length !== 1 || context.value[0].type !== 'Text') {
 		parser.error({
 			code: 'invalid-script',
-			message: `context attribute must be static`
+			message: 'context attribute must be static'
 		}, start);
 	}
 
@@ -20,8 +20,8 @@ function get_context(parser: Parser, attributes: any[], start: number): string {
 
 	if (value !== 'module') {
 		parser.error({
-			code: `invalid-script`,
+			code: 'invalid-script',
-			message: `If the context attribute is supplied, its value must be "module"`
+			message: 'If the context attribute is supplied, its value must be "module"'
 		}, context.start);
 	}
 
@@ -33,8 +33,8 @@ export default function read_script(parser: Parser, start: number, attributes: N
 	const script_end = parser.template.indexOf(script_closing_tag, script_start);
 
 	if (script_end === -1) parser.error({
-		code: `unclosed-script`,
+		code: 'unclosed-script',
-		message: `<script> must have a closing tag`
+		message: '<script> must have a closing tag'
 	});
 
 	const source = parser.template.slice(0, script_start).replace(/[^\n]/g, ' ') +

src/compiler/parse/read/style.ts

@@ -19,7 +19,7 @@ export default function read_style(parser: Parser, start: number, attributes: No
 	} catch (err) {
 		if (err.name === 'CssSyntaxError') {
 			parser.error({
-				code: `css-syntax-error`,
+				code: 'css-syntax-error',
 				message: err.message
 			}, err.offset);
 		} else {
@@ -40,7 +40,7 @@ export default function read_style(parser: Parser, start: number, attributes: No
 
 					if (is_ref_selector(a, b)) {
 						parser.error({
-							code: `invalid-ref-selector`,
+							code: 'invalid-ref-selector',
 							message: 'ref selectors are no longer supported'
 						}, a.loc.start.offset);
 					}
@@ -49,15 +49,15 @@ export default function read_style(parser: Parser, start: number, attributes: No
 
 			if (node.type === 'Declaration' && node.value.type === 'Value' && node.value.children.length === 0) {
 				parser.error({
-					code: `invalid-declaration`,
+					code: 'invalid-declaration',
-					message: `Declaration cannot be empty`
+					message: 'Declaration cannot be empty'
 				}, node.start);
 			}
 
 			if (node.type === 'PseudoClassSelector' && node.name === 'global' && node.children === null) {
 				parser.error({
-					code: `css-syntax-error`,
+					code: 'css-syntax-error',
-					message: `:global() must contain a selector`
+					message: ':global() must contain a selector'
 				}, node.loc.start.offset);
 			}
 

src/compiler/parse/state/mustache.ts

@@ -67,8 +67,8 @@ export default function mustache(parser: Parser) {
 			expected = 'key';
 		} else {
 			parser.error({
-				code: `unexpected-block-close`,
+				code: 'unexpected-block-close',
-				message: `Unexpected block closing tag`
+				message: 'Unexpected block closing tag'
 			});
 		}
 
@@ -100,7 +100,7 @@ export default function mustache(parser: Parser) {
 		if (parser.eat('if')) {
 			parser.error({
 				code: 'invalid-elseif',
-				message: `'elseif' should be 'else if'`
+				message: "'elseif' should be 'else if'"
 			});
 		}
 
@@ -111,10 +111,10 @@ export default function mustache(parser: Parser) {
 			const block = parser.current();
 			if (block.type !== 'IfBlock') {
 				parser.error({
-					code: `invalid-elseif-placement`,
+					code: 'invalid-elseif-placement',
 					message: parser.stack.some(block => block.type === 'IfBlock')
 						? `Expected to close ${to_string(block)} before seeing {:else if ...} block`
-						: `Cannot have an {:else if ...} block outside an {#if ...} block`
+						: 'Cannot have an {:else if ...} block outside an {#if ...} block'
 				});
 			}
 
@@ -149,10 +149,10 @@ export default function mustache(parser: Parser) {
 			const block = parser.current();
 			if (block.type !== 'IfBlock' && block.type !== 'EachBlock') {
 				parser.error({
-					code: `invalid-else-placement`,
+					code: 'invalid-else-placement',
 					message: parser.stack.some(block => block.type === 'IfBlock' || block.type === 'EachBlock')
 						? `Expected to close ${to_string(block)} before seeing {:else} block`
-						: `Cannot have an {:else} block outside an {#if ...} or {#each ...} block`
+						: 'Cannot have an {:else} block outside an {#if ...} or {#each ...} block'
 				});
 			}
 
@@ -175,19 +175,19 @@ export default function mustache(parser: Parser) {
 		if (is_then) {
 			if (block.type !== 'PendingBlock') {
 				parser.error({
-					code: `invalid-then-placement`,
+					code: 'invalid-then-placement',
 					message: parser.stack.some(block => block.type === 'PendingBlock')
 						? `Expected to close ${to_string(block)} before seeing {:then} block`
-						: `Cannot have an {:then} block outside an {#await ...} block`
+						: 'Cannot have an {:then} block outside an {#await ...} block'
 				});
 			}
 		} else {
 			if (block.type !== 'ThenBlock' && block.type !== 'PendingBlock') {
 				parser.error({
-					code: `invalid-catch-placement`,
+					code: 'invalid-catch-placement',
 					message: parser.stack.some(block => block.type === 'ThenBlock' || block.type === 'PendingBlock')
 						? `Expected to close ${to_string(block)} before seeing {:catch} block`
-						: `Cannot have an {:catch} block outside an {#await ...} block`
+						: 'Cannot have an {:catch} block outside an {#await ...} block'
 				});
 			}
 		}
@@ -227,8 +227,8 @@ export default function mustache(parser: Parser) {
 			type = 'KeyBlock';
 		} else {
 			parser.error({
-				code: `expected-block-type`,
+				code: 'expected-block-type',
-				message: `Expected if, each, await or key`
+				message: 'Expected if, each, await or key'
 			});
 		}
 
@@ -289,8 +289,8 @@ export default function mustache(parser: Parser) {
 				parser.allow_whitespace();
 				block.index = parser.read_identifier();
 				if (!block.index) parser.error({
-					code: `expected-name`,
+					code: 'expected-name',
-					message: `Expected name`
+					message: 'Expected name'
 				});
 
 				parser.allow_whitespace();

src/compiler/parse/state/tag.ts

@@ -124,7 +124,7 @@ export default function tag(parser: Parser) {
 	if (is_closing_tag) {
 		if (is_void(name)) {
 			parser.error({
-				code: `invalid-void-content`,
+				code: 'invalid-void-content',
 				message: `<${name}> is a void element and cannot have children, or a closing tag`
 			}, start);
 		}
@@ -138,7 +138,7 @@ export default function tag(parser: Parser) {
 					? `</${name}> attempted to close <${name}> that was already automatically closed by <${parser.last_auto_closed_tag.reason}>`
 					: `</${name}> attempted to close an element that was not open`;
 				parser.error({
-					code: `invalid-closing-tag`,
+					code: 'invalid-closing-tag',
 					message
 				}, start);
 			}
@@ -179,16 +179,16 @@ export default function tag(parser: Parser) {
 		const index = element.attributes.findIndex(attr => attr.type === 'Attribute' && attr.name === 'this');
 		if (!~index) {
 			parser.error({
-				code: `missing-component-definition`,
+				code: 'missing-component-definition',
-				message: `<svelte:component> must have a 'this' attribute`
+				message: "<svelte:component> must have a 'this' attribute"
 			}, start);
 		}
 
 		const definition = element.attributes.splice(index, 1)[0];
 		if (definition.value === true || definition.value.length !== 1 || definition.value[0].type === 'Text') {
 			parser.error({
-				code: `invalid-component-definition`,
+				code: 'invalid-component-definition',
-				message: `invalid component definition`
+				message: 'invalid component definition'
 			}, definition.start);
 		}
 
@@ -262,8 +262,8 @@ function read_tag_name(parser: Parser) {
 
 		if (!legal) {
 			parser.error({
-				code: `invalid-self-placement`,
+				code: 'invalid-self-placement',
-				message: `<svelte:self> components can only exist inside {#if} blocks, {#each} blocks, or slots passed to components`
+				message: '<svelte:self> components can only exist inside {#if} blocks, {#each} blocks, or slots passed to components'
 			}, start);
 		}
 
@@ -290,8 +290,8 @@ function read_tag_name(parser: Parser) {
 
 	if (!valid_tag_name.test(name)) {
 		parser.error({
-			code: `invalid-tag-name`,
+			code: 'invalid-tag-name',
-			message: `Expected valid tag name`
+			message: 'Expected valid tag name'
 		}, start);
 	}
 
@@ -304,7 +304,7 @@ function read_attribute(parser: Parser, unique_names: Set<string>) {
 	function check_unique(name: string) {
 		if (unique_names.has(name)) {
 			parser.error({
-				code: `duplicate-attribute`,
+				code: 'duplicate-attribute',
 				message: 'Attributes need to be unique'
 			}, start);
 		}
@@ -373,8 +373,8 @@ function read_attribute(parser: Parser, unique_names: Set<string>) {
 		end = parser.index;
 	} else if (parser.match_regex(/["']/)) {
 		parser.error({
-			code: `unexpected-token`,
+			code: 'unexpected-token',
-			message: `Expected =`
+			message: 'Expected ='
 		}, parser.index);
 	}
 
@@ -389,7 +389,7 @@ function read_attribute(parser: Parser, unique_names: Set<string>) {
 
 		if (type === 'Ref') {
 			parser.error({
-				code: `invalid-ref-directive`,
+				code: 'invalid-ref-directive',
 				message: `The ref directive is no longer supported — use \`bind:this={${directive_name}}\` instead`
 			}, start);
 		}
@@ -397,8 +397,8 @@ function read_attribute(parser: Parser, unique_names: Set<string>) {
 		if (value[0]) {
 			if ((value as any[]).length > 1 || value[0].type === 'Text') {
 				parser.error({
-					code: `invalid-directive-value`,
+					code: 'invalid-directive-value',
-					message: `Directive value must be a JavaScript expression enclosed in curly braces`
+					message: 'Directive value must be a JavaScript expression enclosed in curly braces'
 				}, value[0].start);
 			}
 		}
@@ -453,11 +453,11 @@ function get_directive_type(name: string): DirectiveType {
 }
 
 function read_attribute_value(parser: Parser) {
-	const quote_mark = parser.eat(`'`) ? `'` : parser.eat(`"`) ? `"` : null;
+	const quote_mark = parser.eat("'") ? "'" : parser.eat('"') ? '"' : null;
 
 	const regex = (
-		quote_mark === `'` ? /'/ :
+		quote_mark === "'" ? /'/ :
-			quote_mark === `"` ? /"/ :
+			quote_mark === '"' ? /"/ :
 				/(\/>|[\s"'=<>`])/
 	);
 
@@ -520,7 +520,7 @@ function read_sequence(parser: Parser, done: () => boolean): TemplateNode[] {
 	}
 
 	parser.error({
-		code: `unexpected-eof`,
+		code: 'unexpected-eof',
-		message: `Unexpected end of input`
+		message: 'Unexpected end of input'
 	});
 }

src/compiler/parse/utils/bracket.ts

@@ -1,7 +1,7 @@
-const SQUARE_BRACKET_OPEN = "[".charCodeAt(0);
+const SQUARE_BRACKET_OPEN = '['.charCodeAt(0);
-const SQUARE_BRACKET_CLOSE = "]".charCodeAt(0);
+const SQUARE_BRACKET_CLOSE = ']'.charCodeAt(0);
-const CURLY_BRACKET_OPEN = "{".charCodeAt(0);
+const CURLY_BRACKET_OPEN = '{'.charCodeAt(0);
-const CURLY_BRACKET_CLOSE = "}".charCodeAt(0);
+const CURLY_BRACKET_CLOSE = '}'.charCodeAt(0);
 
 export function is_bracket_open(code) {
 	return code === SQUARE_BRACKET_OPEN || code === CURLY_BRACKET_OPEN;

src/compiler/preprocess/index.ts

@@ -26,7 +26,7 @@ function parse_attributes(str: string) {
 		if (p === -1) {
 			attrs[attr] = true;
 		} else {
-			attrs[attr.slice(0, p)] = `'"`.includes(attr[p + 1]) ?
+			attrs[attr.slice(0, p)] = '\'"'.includes(attr[p + 1]) ?
 				attr.slice(p + 2, -1) :
 				attr.slice(p + 1);
 		}

src/runtime/internal/dev.ts

@@ -6,17 +6,17 @@ export function dispatch_dev<T=any>(type: string, detail?: T) {
 }
 
 export function append_dev(target: Node, node: Node) {
-	dispatch_dev("SvelteDOMInsert", { target, node });
+	dispatch_dev('SvelteDOMInsert', { target, node });
 	append(target, node);
 }
 
 export function insert_dev(target: Node, node: Node, anchor?: Node) {
-	dispatch_dev("SvelteDOMInsert", { target, node, anchor });
+	dispatch_dev('SvelteDOMInsert', { target, node, anchor });
 	insert(target, node, anchor);
 }
 
 export function detach_dev(node: Node) {
-	dispatch_dev("SvelteDOMRemove", { node });
+	dispatch_dev('SvelteDOMRemove', { node });
 	detach(node);
 }
 
@@ -39,15 +39,15 @@ export function detach_after_dev(before: Node) {
 }
 
 export function listen_dev(node: Node, event: string, handler: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions | EventListenerOptions, has_prevent_default?: boolean, has_stop_propagation?: boolean) {
-	const modifiers = options === true ? [ "capture" ] : options ? Array.from(Object.keys(options)) : [];
+	const modifiers = options === true ? [ 'capture' ] : options ? Array.from(Object.keys(options)) : [];
 	if (has_prevent_default) modifiers.push('preventDefault');
 	if (has_stop_propagation) modifiers.push('stopPropagation');
 
-	dispatch_dev("SvelteDOMAddEventListener", { node, event, handler, modifiers });
+	dispatch_dev('SvelteDOMAddEventListener', { node, event, handler, modifiers });
 
 	const dispose = listen(node, event, handler, options);
 	return () => {
-		dispatch_dev("SvelteDOMRemoveEventListener", { node, event, handler, modifiers });
+		dispatch_dev('SvelteDOMRemoveEventListener', { node, event, handler, modifiers });
 		dispose();
 	};
 }
@@ -55,27 +55,27 @@ export function listen_dev(node: Node, event: string, handler: EventListenerOrEv
 export function attr_dev(node: Element, attribute: string, value?: string) {
 	attr(node, attribute, value);
 
-	if (value == null) dispatch_dev("SvelteDOMRemoveAttribute", { node, attribute });
+	if (value == null) dispatch_dev('SvelteDOMRemoveAttribute', { node, attribute });
-	else dispatch_dev("SvelteDOMSetAttribute", { node, attribute, value });
+	else dispatch_dev('SvelteDOMSetAttribute', { node, attribute, value });
 }
 
 export function prop_dev(node: Element, property: string, value?: any) {
 	node[property] = value;
 
-	dispatch_dev("SvelteDOMSetProperty", { node, property, value });
+	dispatch_dev('SvelteDOMSetProperty', { node, property, value });
 }
 
 export function dataset_dev(node: HTMLElement, property: string, value?: any) {
 	node.dataset[property] = value;
 
-	dispatch_dev("SvelteDOMSetDataset", { node, property, value });
+	dispatch_dev('SvelteDOMSetDataset', { node, property, value });
 }
 
 export function set_data_dev(text, data) {
 	data = '' + data;
 	if (text.wholeText === data) return;
 
-	dispatch_dev("SvelteDOMSetData", { node: text, data });
+	dispatch_dev('SvelteDOMSetData', { node: text, data });
 	text.data = data;
 }
 
@@ -115,7 +115,7 @@ export class SvelteComponentDev extends SvelteComponent {
 		$$inline?: boolean;
     }) {
 		if (!options || (!options.target && !options.$$inline)) {
-			throw new Error(`'target' is a required option`);
+			throw new Error("'target' is a required option");
 		}
 
 		super();
@@ -124,7 +124,7 @@ export class SvelteComponentDev extends SvelteComponent {
 	$destroy() {
 		super.$destroy();
 		this.$destroy = () => {
-			console.warn(`Component was already destroyed`); // eslint-disable-line no-console
+			console.warn('Component was already destroyed'); // eslint-disable-line no-console
 		};
 	}
 
@@ -137,7 +137,7 @@ export function loop_guard(timeout) {
 	const start = Date.now();
 	return () => {
 		if (Date.now() - start > timeout) {
-			throw new Error(`Infinite loop detected`);
+			throw new Error('Infinite loop detected');
 		}
 	};
 }

src/runtime/internal/dom.ts

@@ -1,4 +1,4 @@
-import { has_prop } from "./utils";
+import { has_prop } from './utils';
 
 export function append(target: Node, node: Node) {
 	target.appendChild(node);
@@ -269,7 +269,7 @@ export function add_resize_listener(node: HTMLElement, fn: () => void) {
 
 	const iframe = element('iframe');
 	iframe.setAttribute('style',
-		`display: block; position: absolute; top: 0; left: 0; width: 100%; height: 100%; ` +
+		'display: block; position: absolute; top: 0; left: 0; width: 100%; height: 100%; ' +
 		`overflow: hidden; border: 0; opacity: 0; pointer-events: none; z-index: ${z_index};`
 	);
 	iframe.setAttribute('aria-hidden', 'true');
@@ -280,7 +280,7 @@ export function add_resize_listener(node: HTMLElement, fn: () => void) {
 	let unsubscribe: () => void;
 
 	if (crossorigin) {
-		iframe.src = `data:text/html,<script>onresize=function(){parent.postMessage(0,'*')}</script>`;
+		iframe.src = "data:text/html,<script>onresize=function(){parent.postMessage(0,'*')}</script>";
 		unsubscribe = listen(window, 'message', (event: MessageEvent) => {
 			if (event.source === iframe.contentWindow) fn();
 		});

src/runtime/internal/keyed_each.ts

@@ -113,7 +113,7 @@ export function validate_each_keys(ctx, list, get_context, get_key) {
 	for (let i = 0; i < list.length; i++) {
 		const key = get_key(get_context(ctx, list, i));
 		if (keys.has(key)) {
-			throw new Error(`Cannot have duplicate keys in a keyed each`);
+			throw new Error('Cannot have duplicate keys in a keyed each');
 		}
 		keys.add(key);
 	}

src/runtime/internal/lifecycle.ts

@@ -7,7 +7,7 @@ export function set_current_component(component) {
 }
 
 export function get_current_component() {
-	if (!current_component) throw new Error(`Function called outside component initialization`);
+	if (!current_component) throw new Error('Function called outside component initialization');
 	return current_component;
 }
 

src/runtime/internal/ssr.ts

@@ -21,9 +21,9 @@ export function spread(args, classes_to_add) {
 		if (invalid_attribute_name_character.test(name)) return;
 
 		const value = attributes[name];
-		if (value === true) str += " " + name;
+		if (value === true) str += ' ' + name;
 		else if (boolean_attributes.has(name.toLowerCase())) {
-			if (value) str += " " + name;
+			if (value) str += ' ' + name;
 		} else if (value != null) {
 			str += ` ${name}="${String(value).replace(/"/g, '"').replace(/'/g, ''')}"`;
 		}
@@ -133,5 +133,5 @@ export function add_attribute(name, value, boolean) {
 }
 
 export function add_classes(classes) {
-	return classes ? ` class="${classes}"` : ``;
+	return classes ? ` class="${classes}"` : '';
 }

src/runtime/internal/style_manager.ts

@@ -40,7 +40,7 @@ export function create_rule(node: Element & ElementCSSInlineStyle, a: number, b:
 	}
 
 	const animation = node.style.animation || '';
-	node.style.animation = `${animation ? `${animation}, ` : ``}${name} ${duration}ms linear ${delay}ms 1 both`;
+	node.style.animation = `${animation ? `${animation}, ` : ''}${name} ${duration}ms linear ${delay}ms 1 both`;
 
 	active += 1;
 	return name;

src/runtime/internal/transitions.ts

@@ -1,5 +1,5 @@
 import { identity as linear, is_function, noop, run_all } from './utils';
-import { now } from "./environment";
+import { now } from './environment';
 import { loop } from './loop';
 import { create_rule, delete_rule } from './style_manager';
 import { custom_event } from './dom';

src/runtime/internal/utils.ts

@@ -1,4 +1,4 @@
-import { Readable } from "svelte/store";
+import { Readable } from 'svelte/store';
 
 export function noop() {}
 

src/runtime/transition/index.ts

@@ -120,7 +120,7 @@ export function slide(node: Element, {
 		duration,
 		easing,
 		css: t =>
-			`overflow: hidden;` +
+			'overflow: hidden;' +
 			`opacity: ${Math.min(t * 20, 1) * opacity};` +
 			`height: ${t * height}px;` +
 			`padding-top: ${t * padding_top}px;` +

test/css/samples/empty-class/_config.js

@@ -1,7 +1,7 @@
 export default {
 	warnings: [{
-		filename: "SvelteComponent.svelte",
+		filename: 'SvelteComponent.svelte',
-		code: `css-unused-selector`,
+		code: 'css-unused-selector',
 		message: 'Unused CSS selector ".x"',
 		start: {
 			line: 4,

test/css/samples/general-siblings-combinator-await/_config.js

@@ -1,7 +1,7 @@
 export default {
 	warnings: [
 		{
-			code: "css-unused-selector",
+			code: 'css-unused-selector',
 			frame: `
 				13:
 				14:   /* no match */
@@ -15,7 +15,7 @@ export default {
 			end: { character: 276, column: 8, line: 15 }
 		},
 		{
-			code: "css-unused-selector",
+			code: 'css-unused-selector',
 			frame: `
 				14:   /* no match */
 				15:   .b ~ .c { color: green; }
@@ -29,7 +29,7 @@ export default {
 			end: { character: 303, column: 8, line: 16 }
 		},
 		{
-			code: "css-unused-selector",
+			code: 'css-unused-selector',
 			frame: `
 				15:   .b ~ .c { color: green; }
 				16:   .c ~ .d { color: green; }

test/css/samples/general-siblings-combinator-each-else-nested/_config.js

@@ -1,7 +1,7 @@
 export default {
 	warnings: [
 		{
-			code: "css-unused-selector",
+			code: 'css-unused-selector',
 			frame: `
 				33:
 				34:   /* no match */

test/css/samples/general-siblings-combinator-each-else/_config.js

@@ -1,7 +1,7 @@
 export default {
 	warnings: [
 		{
-			code: "css-unused-selector",
+			code: 'css-unused-selector',
 			frame: `
 				11:
 				12:   /* no match */

test/css/samples/general-siblings-combinator-if-not-exhaustive-with-each/_config.js

@@ -1,7 +1,7 @@
 export default {
 	warnings: [
 		{
-			code: "css-unused-selector",
+			code: 'css-unused-selector',
 			frame: `
 				16:
 				17:   /* no match */

test/css/samples/general-siblings-combinator-if-not-exhaustive/_config.js

@@ -1,7 +1,7 @@
 export default {
 	warnings: [
 		{
-			code: "css-unused-selector",
+			code: 'css-unused-selector',
 			frame: `
 				12:
 				13:   /* no match */

test/css/samples/general-siblings-combinator-if/_config.js

@@ -1,7 +1,7 @@
 export default {
 	warnings: [
 		{
-			code: "css-unused-selector",
+			code: 'css-unused-selector',
 			frame: `
 				14:
 				15:   /* no match */
@@ -15,7 +15,7 @@ export default {
 			end: { character: 276, column: 8, line: 16 }
 		},
 		{
-			code: "css-unused-selector",
+			code: 'css-unused-selector',
 			frame: `
 				15:   /* no match */
 				16:   .b ~ .c { color: green; }
@@ -29,7 +29,7 @@ export default {
 			end: { character: 303, column: 8, line: 17 }
 		},
 		{
-			code: "css-unused-selector",
+			code: 'css-unused-selector',
 			frame: `
 				16:   .b ~ .c { color: green; }
 				17:   .b ~ .d { color: green; }

test/css/samples/general-siblings-combinator-slot/_config.js

@@ -1,7 +1,7 @@
 export default {
 	warnings: [
 		{
-			code: "css-unused-selector",
+			code: 'css-unused-selector',
 			frame: `
 				 8:
 				 9:   /* no match */
@@ -15,7 +15,7 @@ export default {
 			end: { character: 118, column: 8, line: 10 }
 		},
 		{
-			code: "css-unused-selector",
+			code: 'css-unused-selector',
 			frame: `
 				 9:   /* no match */
 				10:   .a ~ .b { color: green; }
@@ -29,7 +29,7 @@ export default {
 			end: { character: 145, column: 8, line: 11 }
 		},
 		{
-			code: "css-unused-selector",
+			code: 'css-unused-selector',
 			frame: `
 				10:   .a ~ .b { color: green; }
 				11:   .b ~ .c { color: green; }
@@ -43,7 +43,7 @@ export default {
 			end: { character: 172, column: 8, line: 12 }
 		},
 		{
-			code: "css-unused-selector",
+			code: 'css-unused-selector',
 			frame: `
 				11:   .b ~ .c { color: green; }
 				12:   .c ~ .f { color: green; }
@@ -57,7 +57,7 @@ export default {
 			end: { character: 199, column: 8, line: 13 }
 		},
 		{
-			code: "css-unused-selector",
+			code: 'css-unused-selector',
 			frame: `
 				12:   .c ~ .f { color: green; }
 				13:   .f ~ .g { color: green; }
@@ -71,7 +71,7 @@ export default {
 			end: { character: 226, column: 8, line: 14 }
 		},
 		{
-			code: "css-unused-selector",
+			code: 'css-unused-selector',
 			frame: `
 				13:   .f ~ .g { color: green; }
 				14:   .b ~ .f { color: green; }

test/css/samples/general-siblings-combinator-star/_config.js

@@ -1,7 +1,7 @@
 export default {
 	warnings: [
 		{
-			code: "css-unused-selector",
+			code: 'css-unused-selector',
 			frame: `
 				3:     margin-left: 4px;
 				4:   }

test/css/samples/general-siblings-combinator/_config.js

@@ -1,7 +1,7 @@
 export default {
 	warnings: [
 		{
-			code: "css-unused-selector",
+			code: 'css-unused-selector',
 			frame: `
 				10:
 				11:   /* no match */
@@ -15,7 +15,7 @@ export default {
 			end: { character: 288, column: 14, line: 12 }
 		},
 		{
-			code: "css-unused-selector",
+			code: 'css-unused-selector',
 			frame: `
 				11:   /* no match */
 				12:   article ~ div { color: green; }
@@ -29,7 +29,7 @@ export default {
 			end: { character: 322, column: 15, line: 13 }
 		},
 		{
-			code: "css-unused-selector",
+			code: 'css-unused-selector',
 			frame: `
 				12:   article ~ div { color: green; }
 				13:   span ~ article { color: green; }
@@ -43,7 +43,7 @@ export default {
 			end: { character: 353, column: 12, line: 14 }
 		},
 		{
-			code: "css-unused-selector",
+			code: 'css-unused-selector',
 			frame: `
 				13:   span ~ article { color: green; }
 				14:   b ~ article { color: green; }

test/css/samples/omit-scoping-attribute-descendant/_config.js

@@ -1,6 +1,6 @@
 export default {
 	warnings: [{
-		code: `css-unused-selector`,
+		code: 'css-unused-selector',
 		message: 'Unused CSS selector "div > p"',
 		start: {
 			line: 8,

test/css/samples/siblings-combinator-await/_config.js

@@ -1,7 +1,7 @@
 export default {
 	warnings: [
 		{
-			code: "css-unused-selector",
+			code: 'css-unused-selector',
 			frame: `
 				12:
 				13:   /* no match */
@@ -15,7 +15,7 @@ export default {
 			end: { character: 249, column: 8, line: 14 }
 		},
 		{
-			code: "css-unused-selector",
+			code: 'css-unused-selector',
 			frame: `
 				13:   /* no match */
 				14:   .a + .e { color: green; }
@@ -29,7 +29,7 @@ export default {
 			end: { character: 276, column: 8, line: 15 }
 		},
 		{
-			code: "css-unused-selector",
+			code: 'css-unused-selector',
 			frame: `
 				14:   .a + .e { color: green; }
 				15:   .b + .c { color: green; }
@@ -43,7 +43,7 @@ export default {
 			end: { character: 303, column: 8, line: 16 }
 		},
 		{
-			code: "css-unused-selector",
+			code: 'css-unused-selector',
 			frame: `
 				15:   .b + .c { color: green; }
 				16:   .c + .d { color: green; }

test/css/samples/siblings-combinator-each-2/_config.js

@@ -1,7 +1,7 @@
 export default {
 	warnings: [
 		{
-		  code: "css-unused-selector",
+		  code: 'css-unused-selector',
 			frame: `
 				24:   }
 				25:   /* not match */

test/css/samples/siblings-combinator-each-else-nested/_config.js

@@ -1,7 +1,7 @@
 export default {
 	warnings: [
 		{
-			code: "css-unused-selector",
+			code: 'css-unused-selector',
 			frame: `
 				21:
 				22:   /* no match */
@@ -15,7 +15,7 @@ export default {
 			end: { character: 486, column: 8, line: 23 }
 		},
 		{
-			code: "css-unused-selector",
+			code: 'css-unused-selector',
 			frame: `
 				22:   /* no match */
 				23:   .a + .c { color: green; }
@@ -29,7 +29,7 @@ export default {
 			end: { character: 513, column: 8, line: 24 }
 		},
 		{
-			code: "css-unused-selector",
+			code: 'css-unused-selector',
 			frame: `
 				23:   .a + .c { color: green; }
 				24:   .a + .g { color: green; }
@@ -43,7 +43,7 @@ export default {
 			end: { character: 540, column: 8, line: 25 }
 		},
 		{
-			code: "css-unused-selector",
+			code: 'css-unused-selector',
 			frame: `
 				24:   .a + .g { color: green; }
 				25:   .b + .e { color: green; }
@@ -57,7 +57,7 @@ export default {
 			end: { character: 567, column: 8, line: 26 }
 		},
 		{
-			code: "css-unused-selector",
+			code: 'css-unused-selector',
 			frame: `
 				25:   .b + .e { color: green; }
 				26:   .c + .g { color: green; }
@@ -71,7 +71,7 @@ export default {
 			end: { character: 594, column: 8, line: 27 }
 		},
 		{
-			code: "css-unused-selector",
+			code: 'css-unused-selector',
 			frame: `
 				26:   .c + .g { color: green; }
 				27:   .c + .k { color: green; }
@@ -85,7 +85,7 @@ export default {
 			end: { character: 621, column: 8, line: 28 }
 		},
 		{
-			code: "css-unused-selector",
+			code: 'css-unused-selector',
 			frame: `
 				27:   .c + .k { color: green; }
 				28:   .d + .d { color: green; }
@@ -99,7 +99,7 @@ export default {
 			end: { character: 648, column: 8, line: 29 }
 		},
 		{
-			code: "css-unused-selector",
+			code: 'css-unused-selector',
 			frame: `
 				28:   .d + .d { color: green; }
 				29:   .e + .f { color: green; }
@@ -113,7 +113,7 @@ export default {
 			end: { character: 675, column: 8, line: 30 }
 		},
 		{
-			code: "css-unused-selector",
+			code: 'css-unused-selector',
 			frame: `
 				29:   .e + .f { color: green; }
 				30:   .f + .f { color: green; }
@@ -127,7 +127,7 @@ export default {
 			end: { character: 702, column: 8, line: 31 }
 		},
 		{
-			code: "css-unused-selector",
+			code: 'css-unused-selector',
 			frame: `
 				30:   .f + .f { color: green; }
 				31:   .g + .j { color: green; }

test/css/samples/siblings-combinator-each-else/_config.js

@@ -1,7 +1,7 @@
 export default {
 	warnings: [
 		{
-			code: "css-unused-selector",
+			code: 'css-unused-selector',
 			frame: `
 				10:
 				11:   /* no match */
@@ -15,7 +15,7 @@ export default {
 			end: { character: 179, column: 8, line: 12 }
 		},
 		{
-			code: "css-unused-selector",
+			code: 'css-unused-selector',
 			frame: `
 				11:   /* no match */
 				12:   .a + .d { color: green; }

test/css/samples/siblings-combinator-each-nested/_config.js

@@ -1,7 +1,7 @@
 export default {
 	warnings: [
 		{
-			code: "css-unused-selector",
+			code: 'css-unused-selector',
 			frame: `
 				56:
 				57:   /* no match */
@@ -15,7 +15,7 @@ export default {
 			end: { character: 1236, column: 8, line: 58 }
 		},
 		{
-			code: "css-unused-selector",
+			code: 'css-unused-selector',
 			frame: `
 				57:   /* no match */
 				58:   .a + .h { color: green; }
@@ -29,7 +29,7 @@ export default {
 			end: { character: 1263, column: 8, line: 59 }
 		},
 		{
-			code: "css-unused-selector",
+			code: 'css-unused-selector',
 			frame: `
 				58:   .a + .h { color: green; }
 				59:   .a + .i { color: green; }
@@ -43,7 +43,7 @@ export default {
 			end: { character: 1290, column: 8, line: 60 }
 		},
 		{
-			code: "css-unused-selector",
+			code: 'css-unused-selector',
 			frame: `
 				59:   .a + .i { color: green; }
 				60:   .c + .h { color: green; }
@@ -57,7 +57,7 @@ export default {
 			end: { character: 1317, column: 8, line: 61 }
 		},
 		{
-			code: "css-unused-selector",
+			code: 'css-unused-selector',
 			frame: `
 				60:   .c + .h { color: green; }
 				61:   .c + .i { color: green; }
@@ -71,7 +71,7 @@ export default {
 			end: { character: 1344, column: 8, line: 62 }
 		},
 		{
-			code: "css-unused-selector",
+			code: 'css-unused-selector',
 			frame: `
 				61:   .c + .i { color: green; }
 				62:   .d + .f { color: green; }
@@ -85,7 +85,7 @@ export default {
 			end: { character: 1371, column: 8, line: 63 }
 		},
 		{
-			code: "css-unused-selector",
+			code: 'css-unused-selector',
 			frame: `
 				62:   .d + .f { color: green; }
 				63:   .d + .g { color: green; }
@@ -99,7 +99,7 @@ export default {
 			end: { character: 1398, column: 8, line: 64 }
 		},
 		{
-			code: "css-unused-selector",
+			code: 'css-unused-selector',
 			frame: `
 				63:   .d + .g { color: green; }
 				64:   .e + .g { color: green; }

test/css/samples/siblings-combinator-if-not-exhaustive-with-each/_config.js

@@ -1,7 +1,7 @@
 export default {
 	warnings: [
 		{
-			code: "css-unused-selector",
+			code: 'css-unused-selector',
 			frame: `
 				16:
 				17:   /* no match */

test/css/samples/siblings-combinator-if-not-exhaustive/_config.js

@@ -1,7 +1,7 @@
 export default {
 	warnings: [
 		{
-			code: "css-unused-selector",
+			code: 'css-unused-selector',
 			frame: `
 				12:
 				13:   /* no match */

test/css/samples/siblings-combinator-if/_config.js

@@ -1,7 +1,7 @@
 export default {
 	warnings: [
 		{
-			code: "css-unused-selector",
+			code: 'css-unused-selector',
 			frame: `
 				13:
 				14:   /* no match */
@@ -15,7 +15,7 @@ export default {
 			end: { character: 249, column: 8, line: 15 }
 		},
 		{
-			code: "css-unused-selector",
+			code: 'css-unused-selector',
 			frame: `
 				14:   /* no match */
 				15:   .a + .e { color: green; }
@@ -29,7 +29,7 @@ export default {
 			end: { character: 276, column: 8, line: 16 }
 		},
 		{
-			code: "css-unused-selector",
+			code: 'css-unused-selector',
 			frame: `
 				15:   .a + .e { color: green; }
 				16:   .b + .c { color: green; }
@@ -43,7 +43,7 @@ export default {
 			end: { character: 303, column: 8, line: 17 }
 		},
 		{
-			code: "css-unused-selector",
+			code: 'css-unused-selector',
 			frame: `
 				16:   .b + .c { color: green; }
 				17:   .b + .d { color: green; }

test/css/samples/siblings-combinator-slot/_config.js

@@ -1,7 +1,7 @@
 export default {
 	warnings: [
 		{
-			code: "css-unused-selector",
+			code: 'css-unused-selector',
 			frame: `
 				 7:
 				 8:   /* no match */
@@ -15,7 +15,7 @@ export default {
 			end: { character: 91, column: 8, line: 9 }
 		},
 		{
-			code: "css-unused-selector",
+			code: 'css-unused-selector',
 			frame: `
 				 8:   /* no match */
 				 9:   .a + .b { color: green; }
@@ -29,7 +29,7 @@ export default {
 			end: { character: 118, column: 8, line: 10 }
 		},
 		{
-			code: "css-unused-selector",
+			code: 'css-unused-selector',
 			frame: `
 				 9:   .a + .b { color: green; }
 				10:   .b + .c { color: green; }

test/css/samples/siblings-combinator-star/_config.js

@@ -1,7 +1,7 @@
 export default {
 	warnings: [
 		{
-			code: "css-unused-selector",
+			code: 'css-unused-selector',
 			frame: `
 				3:     margin-left: 4px;
 				4:   }

test/css/samples/siblings-combinator/_config.js

@@ -1,7 +1,7 @@
 export default {
 	warnings: [
 		{
-			code: "css-unused-selector",
+			code: 'css-unused-selector',
 			frame: `
 				3:     color: green;
 				4:   }
@@ -15,7 +15,7 @@ export default {
 			end: { character: 58, column: 14, line: 5 }
 		},
 		{
-			code: "css-unused-selector",
+			code: 'css-unused-selector',
 			
 			frame:`
 				 6:     color: green;
@@ -30,7 +30,7 @@ export default {
 			end: { character: 95, column: 15, line: 8 }
 		},
 		{
-			code: "css-unused-selector",
+			code: 'css-unused-selector',
 			
 			frame: `
 				 9:     color: green;
@@ -45,7 +45,7 @@ export default {
 			end: { character: 129, column: 12, line: 11 }
 		},
 		{
-			code: "css-unused-selector",
+			code: 'css-unused-selector',
 			frame: `
 				12:     color: green;
 				13:   }

test/css/samples/unused-selector-child-combinator/_config.js

@@ -1,7 +1,7 @@
 export default {
 	warnings: [
 		{
-			code: "css-unused-selector",
+			code: 'css-unused-selector',
 			message: 'Unused CSS selector "article > *"',
 			frame: `
 			1: <style>
@@ -14,7 +14,7 @@ export default {
 			end: { character: 21, column: 12, line: 2 }
 		},
 		{
-			code: "css-unused-selector",
+			code: 'css-unused-selector',
 			message: 'Unused CSS selector "article *"',
 			frame: `
 			4:   }
@@ -28,7 +28,7 @@ export default {
 			end: { character: 58, column: 10, line: 6 }
 		},
 		{
-			code: "css-unused-selector",
+			code: 'css-unused-selector',
 			message: 'Unused CSS selector ".article > *"',
 			frame: `
 			 8:   }

test/css/samples/unused-selector-leading/_config.js

@@ -1,8 +1,8 @@
 export default {
 	warnings: [
 		{
-			filename: "SvelteComponent.svelte",
+			filename: 'SvelteComponent.svelte',
-			code: `css-unused-selector`,
+			code: 'css-unused-selector',
 			message: 'Unused CSS selector ".foo"',
 			start: {
 				line: 4,
@@ -25,8 +25,8 @@ export default {
 		},
 
 		{
-			filename: "SvelteComponent.svelte",
+			filename: 'SvelteComponent.svelte',
-			code: `css-unused-selector`,
+			code: 'css-unused-selector',
 			message: 'Unused CSS selector ".baz"',
 			start: {
 				line: 4,

test/css/samples/unused-selector-ternary/_config.js

@@ -4,8 +4,8 @@ export default {
 	},
 
 	warnings: [{
-		filename: "SvelteComponent.svelte",
+		filename: 'SvelteComponent.svelte',
-		code: `css-unused-selector`,
+		code: 'css-unused-selector',
 		message: 'Unused CSS selector ".maybeactive"',
 		start: {
 			line: 16,

test/css/samples/unused-selector/_config.js

@@ -1,7 +1,7 @@
 export default {
 	warnings: [{
-		filename: "SvelteComponent.svelte",
+		filename: 'SvelteComponent.svelte',
-		code: `css-unused-selector`,
+		code: 'css-unused-selector',
 		message: 'Unused CSS selector ".bar"',
 		start: {
 			line: 8,

test/custom-elements/index.ts

@@ -4,7 +4,7 @@ import * as http from 'http';
 import { rollup } from 'rollup';
 import virtual from '@rollup/plugin-virtual';
 import puppeteer from 'puppeteer';
-import { addLineNumbers, loadConfig, loadSvelte } from "../helpers";
+import { addLineNumbers, loadConfig, loadSvelte } from '../helpers';
 import { deepEqual } from 'assert';
 
 const page = `
@@ -87,7 +87,7 @@ describe('custom-elements', function() {
 
 						transform(code, id) {
 							if (id.endsWith('.svelte')) {
-								const compiled = svelte.compile(code.replace(/\r/g, ""), {
+								const compiled = svelte.compile(code.replace(/\r/g, ''), {
 									customElement: true,
 									dev: config.dev
 								});

test/custom-elements/samples/extended-builtin/_config.js

@@ -1,6 +1,6 @@
 export default {
 	warnings: [{
-		code: "avoid-is",
+		code: 'avoid-is',
 		message: "The 'is' attribute is not supported cross-browser and should be avoided",
 		pos: 98,
 		start: {

test/custom-elements/samples/nested.skip/test.js

@@ -8,10 +8,10 @@ export default async function (target) {
 	const button = counter.shadowRoot.querySelector('button');
 
 	assert.equal(counter.count, 0);
-	assert.equal(counter.shadowRoot.innerHTML, `<button>count: 0</button>`);
+	assert.equal(counter.shadowRoot.innerHTML, '<button>count: 0</button>');
 
 	await button.dispatchEvent(new MouseEvent('click'));
 
 	assert.equal(counter.count, 1);
-	assert.equal(counter.shadowRoot.innerHTML, `<button>count: 1</button>`);
+	assert.equal(counter.shadowRoot.innerHTML, '<button>count: 1</button>');
 }

test/custom-elements/samples/no-missing-prop-warnings/test.js

@@ -12,7 +12,7 @@ export default function (target) {
 	target.innerHTML = '<my-app foo=yes />';
 
 	assert.deepEqual(warnings, [
-		`<my-app> was created without expected prop 'bar'`
+		"<my-app> was created without expected prop 'bar'"
 	]);
 
 	console.warn = warn;

test/custom-elements/samples/no-svelte-options/_config.js

@@ -1,6 +1,6 @@
 export default {
 	warnings: [{
-		code: "custom-element-no-tag",
+		code: 'custom-element-no-tag',
 		message: "No custom element 'tag' option was specified. To automatically register a custom element, specify a name with a hyphen in it, e.g. <svelte:options tag=\"my-thing\"/>. To hide this warning, use <svelte:options tag={null}/>",
 		pos: 0,
 		start: {

test/custom-elements/samples/no-svelte-options/test.js

@@ -3,7 +3,7 @@ import CustomElement from './main.svelte';
 
 export default function (target) {
 	customElements.define('no-tag', CustomElement);
-	target.innerHTML = `<no-tag name="world"></no-tag>`;
+	target.innerHTML = '<no-tag name="world"></no-tag>';
 
 	const el = target.querySelector('no-tag');
 	const h1 = el.shadowRoot.querySelector('h1');

test/custom-elements/samples/no-tag-warning/_config.js

@@ -1,6 +1,6 @@
 export default {
 	warnings: [{
-		code: "custom-element-no-tag",
+		code: 'custom-element-no-tag',
 		message: "No custom element 'tag' option was specified. To automatically register a custom element, specify a name with a hyphen in it, e.g. <svelte:options tag=\"my-thing\"/>. To hide this warning, use <svelte:options tag={null}/>",
 		pos: 0,
 		start: {

test/custom-elements/samples/no-tag-warning/test.js

@@ -3,7 +3,7 @@ import CustomElement from './main.svelte';
 
 export default function (target) {
 	customElements.define('no-tag', CustomElement);
-	target.innerHTML = `<no-tag name="world"></no-tag>`;
+	target.innerHTML = '<no-tag name="world"></no-tag>';
 
 	const el = target.querySelector('no-tag');
 	const h1 = el.shadowRoot.querySelector('h1');

test/custom-elements/samples/no-tag/test.js

@@ -3,7 +3,7 @@ import CustomElement from './main.svelte';
 
 export default function (target) {
 	customElements.define('no-tag', CustomElement);
-	target.innerHTML = `<no-tag name="world"></no-tag>`;
+	target.innerHTML = '<no-tag name="world"></no-tag>';
 
 	const el = target.querySelector('no-tag');
 	const h1 = el.shadowRoot.querySelector('h1');

test/hydration/samples/if-block-update/_config.js

@@ -19,6 +19,6 @@ export default {
 
 		component.foo = false;
 		component.bar = true;
-		assert.htmlEqual(target.innerHTML, `<p>bar!</p>`);
+		assert.htmlEqual(target.innerHTML, '<p>bar!</p>');
 	}
 };

test/hydration/samples/raw/_config.js

@@ -2,7 +2,7 @@ export default {
 	skip: true, // existing nodes are blown away
 
 	props: {
-		raw: `<p>this is some html</p> <p>and so is this</p>`
+		raw: '<p>this is some html</p> <p>and so is this</p>'
 	},
 
 	snapshot(target) {