diff --git a/src/generators/Generator.ts b/src/generators/Generator.ts
index 48a93cc7f7..91b73b6162 100644
--- a/src/generators/Generator.ts
+++ b/src/generators/Generator.ts
@@ -56,6 +56,8 @@ export default class Generator {
 	expectedProperties: Set<string>;
 	usesRefs: boolean;
 
+	locate: (c: number) => { line: number, column: number };
+
 	stylesheet: Stylesheet;
 
 	importedNames: Set<string>;
@@ -86,6 +88,8 @@ export default class Generator {
 		this.bindingGroups = [];
 		this.indirectDependencies = new Map();
 
+		this.locate = getLocator(this.source);
+
 		// track which properties are needed, so we can provide useful info
 		// in dev mode
 		this.expectedProperties = new Set();
diff --git a/src/generators/dom/Block.ts b/src/generators/dom/Block.ts
index 8acd99b2a8..c0fb7a2c4c 100644
--- a/src/generators/dom/Block.ts
+++ b/src/generators/dom/Block.ts
@@ -1,5 +1,6 @@
 import CodeBuilder from '../../utils/CodeBuilder';
 import deindent from '../../utils/deindent';
+import { escape } from '../../utils/stringify';
 import { DomGenerator } from './index';
 import { Node } from '../../interfaces';
 import shared from './shared';
@@ -9,6 +10,7 @@ export interface BlockOptions {
 	generator?: DomGenerator;
 	expression?: Node;
 	context?: string;
+	comment?: string;
 	key?: string;
 	contexts?: Map<string, string>;
 	indexes?: Map<string, string>;
@@ -27,6 +29,7 @@ export default class Block {
 	name: string;
 	expression: Node;
 	context: string;
+	comment?: string;
 
 	key: string;
 	first: string;
@@ -72,6 +75,7 @@ export default class Block {
 		this.name = options.name;
 		this.expression = options.expression;
 		this.context = options.context;
+		this.comment = options.comment;
 
 		// for keyed each blocks
 		this.key = options.key;
@@ -340,6 +344,7 @@ export default class Block {
 		}
 
 		return deindent`
+			${this.comment && `// ${escape(this.comment)}`}
 			function ${this.name}(${this.params.join(', ')}, #component${this.key ? `, ${localKey}` : ''}) {
 				${this.variables.size > 0 &&
 					`var ${Array.from(this.variables.keys())
diff --git a/src/generators/dom/index.ts b/src/generators/dom/index.ts
index f2ef1d32bf..768aff7a4e 100644
--- a/src/generators/dom/index.ts
+++ b/src/generators/dom/index.ts
@@ -12,6 +12,7 @@ import Generator from '../Generator';
 import Stylesheet from '../../css/Stylesheet';
 import preprocess from './preprocess';
 import Block from './Block';
+import { version } from '../../../package.json';
 import { Parsed, CompileOptions, Node } from '../../interfaces';
 
 export class DomGenerator extends Generator {
@@ -158,7 +159,7 @@ export default function dom(
 		${options.dev && `this._debugName = '${debugName}';`}
 		${options.dev && !generator.customElement &&
 			`if (!options || (!options.target && !options._root)) throw new Error("'target' is a required option");`}
-		this.options = options;
+		@init(this, options);
 		${generator.usesRefs && `this.refs = {};`}
 		this._state = ${templateProperties.data
 			? `@assign(@template.data(), options.data)`
@@ -173,17 +174,8 @@ export default function dom(
 		${generator.bindingGroups.length &&
 			`this._bindingGroups = [${Array(generator.bindingGroups.length).fill('[]').join(', ')}];`}
 
-		this._observers = {
-			pre: Object.create(null),
-			post: Object.create(null)
-		};
-
-		this._handlers = Object.create(null);
 		${templateProperties.ondestroy && `this._handlers.destroy = [@template.ondestroy]`}
 
-		this._root = options._root || this;
-		this._yield = options._yield;
-		this._bind = options._bind;
 		${generator.slots.size && `this._slotted = options.slots || {};`}
 
 		${generator.customElement ?
@@ -410,6 +402,8 @@ export default function dom(
 		});
 	}
 
+	result = `/* ${options.filename ? `${options.filename} ` : ``}generated by Svelte v${version} */\n\n${result}`;
+
 	return generator.generate(result, options, {
 		name,
 		format,
diff --git a/src/generators/dom/preprocess.ts b/src/generators/dom/preprocess.ts
index 1fdfababeb..b993dcb43f 100644
--- a/src/generators/dom/preprocess.ts
+++ b/src/generators/dom/preprocess.ts
@@ -22,6 +22,25 @@ function getChildState(parent: State, child = {}) {
 	);
 }
 
+function createDebuggingComment(node: Node, generator: DomGenerator) {
+	const { locate, source } = generator;
+
+	let c = node.start;
+	if (node.type === 'ElseBlock') {
+		while (source[c] !== '{') c -= 1;
+		c -= 1;
+	}
+
+	let d = node.expression ? node.expression.end : c;
+	while (source[d] !== '}') d += 1;
+	d += 2;
+
+	const start = locate(c);
+	const loc = `(${start.line + 1}:${start.column})`;
+
+	return `${loc} ${source.slice(c, d)}`.replace(/\n/g, ' ');
+}
+
 // Whitespace inside one of these elements will not result in
 // a whitespace node being created in any circumstances. (This
 // list is almost certainly very incomplete)
@@ -107,6 +126,7 @@ const preprocessors = {
 			block.addDependencies(dependencies);
 
 			node._block = block.child({
+				comment: createDebuggingComment(node, generator),
 				name: generator.getUniqueName(`create_if_block`),
 			});
 
@@ -127,6 +147,7 @@ const preprocessors = {
 				attachBlocks(node.else.children[0]);
 			} else if (node.else) {
 				node.else._block = block.child({
+					comment: createDebuggingComment(node.else, generator),
 					name: generator.getUniqueName(`create_if_block`),
 				});
 
@@ -202,6 +223,7 @@ const preprocessors = {
 		contextDependencies.set(node.context, dependencies);
 
 		node._block = block.child({
+			comment: createDebuggingComment(node, generator),
 			name: generator.getUniqueName('create_each_block'),
 			expression: node.expression,
 			context: node.context,
@@ -231,6 +253,7 @@ const preprocessors = {
 
 		if (node.else) {
 			node.else._block = block.child({
+				comment: createDebuggingComment(node.else, generator),
 				name: generator.getUniqueName(`${node._block.name}_else`),
 			});
 
diff --git a/src/generators/dom/visitors/EachBlock.ts b/src/generators/dom/visitors/EachBlock.ts
index e0d941511e..03c0918ce0 100644
--- a/src/generators/dom/visitors/EachBlock.ts
+++ b/src/generators/dom/visitors/EachBlock.ts
@@ -160,7 +160,7 @@ function keyed(
 	const last = block.getUniqueName(`${each_block}_last`);
 	const expected = block.getUniqueName(`${each_block}_expected`);
 
-	block.addVariable(lookup, `Object.create(null)`);
+	block.addVariable(lookup, `@blankObject()`);
 	block.addVariable(head);
 	block.addVariable(last);
 
diff --git a/src/generators/server-side-rendering/index.ts b/src/generators/server-side-rendering/index.ts
index 11918995e7..d624400b91 100644
--- a/src/generators/server-side-rendering/index.ts
+++ b/src/generators/server-side-rendering/index.ts
@@ -103,7 +103,7 @@ export default function ssr(
 
 		var ${name} = {};
 
-		${name}.filename = ${stringify(options.filename)};
+		${options.filename && `${name}.filename = ${stringify(options.filename)}`};
 
 		${name}.data = function() {
 			return ${templateProperties.data ? `@template.data()` : `{}`};
diff --git a/src/index.ts b/src/index.ts
index c9c4d23a1e..f2a2af1483 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -12,9 +12,6 @@ function normalizeOptions(options: CompileOptions): CompileOptions {
 		{
 			generate: 'dom',
 
-			// a filename is necessary for sourcemap generation
-			filename: 'SvelteComponent.html',
-
 			onwarn: (warning: Warning) => {
 				if (warning.loc) {
 					console.warn(
diff --git a/src/shared/index.js b/src/shared/index.js
index 34d85897df..dcc2895831 100644
--- a/src/shared/index.js
+++ b/src/shared/index.js
@@ -4,6 +4,10 @@ export * from './dom.js';
 export * from './transitions.js';
 export * from './utils.js';
 
+export function blankObject() {
+	return Object.create(null);
+}
+
 export function destroy(detach) {
 	this.destroy = noop;
 	this.fire('destroy');
@@ -46,10 +50,6 @@ export function dispatchObservers(component, group, changed, newState, oldState)
 	}
 }
 
-export function get(key) {
-	return key ? this._state[key] : this._state;
-}
-
 export function fire(eventName, data) {
 	var handlers =
 		eventName in this._handlers && this._handlers[eventName].slice();
@@ -60,6 +60,20 @@ export function fire(eventName, data) {
 	}
 }
 
+export function get(key) {
+	return key ? this._state[key] : this._state;
+}
+
+export function init(component, options) {
+	component.options = options;
+
+	component._observers = { pre: blankObject(), post: blankObject() };
+	component._handlers = blankObject();
+	component._root = options._root || component;
+	component._yield = options._yield;
+	component._bind = options._bind;
+}
+
 export function observe(key, callback, options) {
 	var group = options && options.defer
 		? this._observers.post
diff --git a/src/utils/CodeBuilder.ts b/src/utils/CodeBuilder.ts
index eab930d96e..5d0477ce68 100644
--- a/src/utils/CodeBuilder.ts
+++ b/src/utils/CodeBuilder.ts
@@ -44,7 +44,7 @@ export default class CodeBuilder {
 				this.result += `\n${this.indent}}`;
 			}
 
-			this.result += `${this.last === ChunkType.Block ? '\n\n' : '\n'}${this.indent}if ( ${condition} ) {\n${body}`;
+			this.result += `${this.last === ChunkType.Block ? '\n\n' : '\n'}${this.indent}if (${condition}) {\n${body}`;
 			this.lastCondition = condition;
 		}
 
diff --git a/test/js/index.js b/test/js/index.js
index 581df93dd8..170c396a2e 100644
--- a/test/js/index.js
+++ b/test/js/index.js
@@ -71,7 +71,7 @@ describe("js", () => {
 					expectedBundle.trim().replace(/^\s+$/gm, "")
 				);
 			}).catch(err => {
-				console.error(err.loc);
+				if (err.loc) console.error(err.loc);
 				throw err;
 			});
 		});
diff --git a/test/js/samples/collapses-text-around-comments/expected-bundle.js b/test/js/samples/collapses-text-around-comments/expected-bundle.js
index 5e61b5cb39..3ad254d588 100644
--- a/test/js/samples/collapses-text-around-comments/expected-bundle.js
+++ b/test/js/samples/collapses-text-around-comments/expected-bundle.js
@@ -37,6 +37,10 @@ function setAttribute(node, attribute, value) {
 	node.setAttribute(attribute, value);
 }
 
+function blankObject() {
+	return Object.create(null);
+}
+
 function destroy(detach) {
 	this.destroy = noop;
 	this.fire('destroy');
@@ -72,10 +76,6 @@ function dispatchObservers(component, group, changed, newState, oldState) {
 	}
 }
 
-function get(key) {
-	return key ? this._state[key] : this._state;
-}
-
 function fire(eventName, data) {
 	var handlers =
 		eventName in this._handlers && this._handlers[eventName].slice();
@@ -86,6 +86,20 @@ function fire(eventName, data) {
 	}
 }
 
+function get(key) {
+	return key ? this._state[key] : this._state;
+}
+
+function init(component, options) {
+	component.options = options;
+
+	component._observers = { pre: blankObject(), post: blankObject() };
+	component._handlers = blankObject();
+	component._root = options._root || component;
+	component._yield = options._yield;
+	component._bind = options._bind;
+}
+
 function observe(key, callback, options) {
 	var group = options && options.defer
 		? this._observers.post
@@ -175,6 +189,8 @@ var proto = {
 	_unmount: _unmount
 };
 
+/* generated by Svelte v1.39.3 */
+
 var template = (function() {
 	return {
 		data: function () {
@@ -214,7 +230,7 @@ function create_main_fragment(state, component) {
 		},
 
 		update: function(changed, state) {
-			if ( changed.foo ) {
+			if (changed.foo) {
 				text.data = state.foo;
 			}
 		},
@@ -228,20 +244,9 @@ function create_main_fragment(state, component) {
 }
 
 function SvelteComponent(options) {
-	this.options = options;
+	init(this, options);
 	this._state = assign(template.data(), options.data);
 
-	this._observers = {
-		pre: Object.create(null),
-		post: Object.create(null)
-	};
-
-	this._handlers = Object.create(null);
-
-	this._root = options._root || this;
-	this._yield = options._yield;
-	this._bind = options._bind;
-
 	if (!document.getElementById("svelte-3590263702-style")) add_css();
 
 	this._fragment = create_main_fragment(this._state, this);
diff --git a/test/js/samples/collapses-text-around-comments/expected.js b/test/js/samples/collapses-text-around-comments/expected.js
index dd6689737e..b80ad4e78e 100644
--- a/test/js/samples/collapses-text-around-comments/expected.js
+++ b/test/js/samples/collapses-text-around-comments/expected.js
@@ -1,4 +1,6 @@
-import { appendNode, assign, createElement, createText, detachNode, insertNode, noop, proto, setAttribute } from "svelte/shared.js";
+/* generated by Svelte v1.39.3 */
+
+import { appendNode, assign, createElement, createText, detachNode, init, insertNode, noop, proto, setAttribute } from "svelte/shared.js";
 
 var template = (function() {
 	return {
@@ -39,7 +41,7 @@ function create_main_fragment(state, component) {
 		},
 
 		update: function(changed, state) {
-			if ( changed.foo ) {
+			if (changed.foo) {
 				text.data = state.foo;
 			}
 		},
@@ -53,20 +55,9 @@ function create_main_fragment(state, component) {
 }
 
 function SvelteComponent(options) {
-	this.options = options;
+	init(this, options);
 	this._state = assign(template.data(), options.data);
 
-	this._observers = {
-		pre: Object.create(null),
-		post: Object.create(null)
-	};
-
-	this._handlers = Object.create(null);
-
-	this._root = options._root || this;
-	this._yield = options._yield;
-	this._bind = options._bind;
-
 	if (!document.getElementById("svelte-3590263702-style")) add_css();
 
 	this._fragment = create_main_fragment(this._state, this);
diff --git a/test/js/samples/computed-collapsed-if/expected-bundle.js b/test/js/samples/computed-collapsed-if/expected-bundle.js
index 5e7b1d99c7..51eaaf39bc 100644
--- a/test/js/samples/computed-collapsed-if/expected-bundle.js
+++ b/test/js/samples/computed-collapsed-if/expected-bundle.js
@@ -13,6 +13,10 @@ function assign(target) {
 	return target;
 }
 
+function blankObject() {
+	return Object.create(null);
+}
+
 function destroy(detach) {
 	this.destroy = noop;
 	this.fire('destroy');
@@ -48,10 +52,6 @@ function dispatchObservers(component, group, changed, newState, oldState) {
 	}
 }
 
-function get(key) {
-	return key ? this._state[key] : this._state;
-}
-
 function fire(eventName, data) {
 	var handlers =
 		eventName in this._handlers && this._handlers[eventName].slice();
@@ -62,6 +62,20 @@ function fire(eventName, data) {
 	}
 }
 
+function get(key) {
+	return key ? this._state[key] : this._state;
+}
+
+function init(component, options) {
+	component.options = options;
+
+	component._observers = { pre: blankObject(), post: blankObject() };
+	component._handlers = blankObject();
+	component._root = options._root || component;
+	component._yield = options._yield;
+	component._bind = options._bind;
+}
+
 function observe(key, callback, options) {
 	var group = options && options.defer
 		? this._observers.post
@@ -151,6 +165,8 @@ var proto = {
 	_unmount: _unmount
 };
 
+/* generated by Svelte v1.39.3 */
+
 var template = (function() {
 	return {
 		computed: {
@@ -176,21 +192,10 @@ function create_main_fragment(state, component) {
 }
 
 function SvelteComponent(options) {
-	this.options = options;
+	init(this, options);
 	this._state = options.data || {};
 	this._recompute({}, this._state, {}, true);
 
-	this._observers = {
-		pre: Object.create(null),
-		post: Object.create(null)
-	};
-
-	this._handlers = Object.create(null);
-
-	this._root = options._root || this;
-	this._yield = options._yield;
-	this._bind = options._bind;
-
 	this._fragment = create_main_fragment(this._state, this);
 
 	if (options.target) {
@@ -202,7 +207,7 @@ function SvelteComponent(options) {
 assign(SvelteComponent.prototype, proto);
 
 SvelteComponent.prototype._recompute = function _recompute(changed, state, oldState, isInitial) {
-	if ( isInitial || changed.x ) {
+	if (isInitial || changed.x) {
 		if (differs((state.a = template.computed.a(state.x)), oldState.a)) changed.a = true;
 		if (differs((state.b = template.computed.b(state.x)), oldState.b)) changed.b = true;
 	}
diff --git a/test/js/samples/computed-collapsed-if/expected.js b/test/js/samples/computed-collapsed-if/expected.js
index 87804092f2..9a0ef1c2b4 100644
--- a/test/js/samples/computed-collapsed-if/expected.js
+++ b/test/js/samples/computed-collapsed-if/expected.js
@@ -1,4 +1,6 @@
-import { assign, differs, noop, proto } from "svelte/shared.js";
+/* generated by Svelte v1.39.3 */
+
+import { assign, differs, init, noop, proto } from "svelte/shared.js";
 
 var template = (function() {
 	return {
@@ -25,21 +27,10 @@ function create_main_fragment(state, component) {
 }
 
 function SvelteComponent(options) {
-	this.options = options;
+	init(this, options);
 	this._state = options.data || {};
 	this._recompute({}, this._state, {}, true);
 
-	this._observers = {
-		pre: Object.create(null),
-		post: Object.create(null)
-	};
-
-	this._handlers = Object.create(null);
-
-	this._root = options._root || this;
-	this._yield = options._yield;
-	this._bind = options._bind;
-
 	this._fragment = create_main_fragment(this._state, this);
 
 	if (options.target) {
@@ -51,7 +42,7 @@ function SvelteComponent(options) {
 assign(SvelteComponent.prototype, proto);
 
 SvelteComponent.prototype._recompute = function _recompute(changed, state, oldState, isInitial) {
-	if ( isInitial || changed.x ) {
+	if (isInitial || changed.x) {
 		if (differs((state.a = template.computed.a(state.x)), oldState.a)) changed.a = true;
 		if (differs((state.b = template.computed.b(state.x)), oldState.b)) changed.b = true;
 	}
diff --git a/test/js/samples/css-media-query/expected-bundle.js b/test/js/samples/css-media-query/expected-bundle.js
index bba05e07aa..9ffeb2f221 100644
--- a/test/js/samples/css-media-query/expected-bundle.js
+++ b/test/js/samples/css-media-query/expected-bundle.js
@@ -33,6 +33,10 @@ function setAttribute(node, attribute, value) {
 	node.setAttribute(attribute, value);
 }
 
+function blankObject() {
+	return Object.create(null);
+}
+
 function destroy(detach) {
 	this.destroy = noop;
 	this.fire('destroy');
@@ -68,10 +72,6 @@ function dispatchObservers(component, group, changed, newState, oldState) {
 	}
 }
 
-function get(key) {
-	return key ? this._state[key] : this._state;
-}
-
 function fire(eventName, data) {
 	var handlers =
 		eventName in this._handlers && this._handlers[eventName].slice();
@@ -82,6 +82,20 @@ function fire(eventName, data) {
 	}
 }
 
+function get(key) {
+	return key ? this._state[key] : this._state;
+}
+
+function init(component, options) {
+	component.options = options;
+
+	component._observers = { pre: blankObject(), post: blankObject() };
+	component._handlers = blankObject();
+	component._root = options._root || component;
+	component._yield = options._yield;
+	component._bind = options._bind;
+}
+
 function observe(key, callback, options) {
 	var group = options && options.defer
 		? this._observers.post
@@ -171,6 +185,8 @@ var proto = {
 	_unmount: _unmount
 };
 
+/* generated by Svelte v1.39.3 */
+
 function encapsulateStyles(node) {
 	setAttribute(node, "svelte-2363328337", "");
 }
@@ -210,20 +226,9 @@ function create_main_fragment(state, component) {
 }
 
 function SvelteComponent(options) {
-	this.options = options;
+	init(this, options);
 	this._state = options.data || {};
 
-	this._observers = {
-		pre: Object.create(null),
-		post: Object.create(null)
-	};
-
-	this._handlers = Object.create(null);
-
-	this._root = options._root || this;
-	this._yield = options._yield;
-	this._bind = options._bind;
-
 	if (!document.getElementById("svelte-2363328337-style")) add_css();
 
 	this._fragment = create_main_fragment(this._state, this);
diff --git a/test/js/samples/css-media-query/expected.js b/test/js/samples/css-media-query/expected.js
index 8a70516367..a70623ec7b 100644
--- a/test/js/samples/css-media-query/expected.js
+++ b/test/js/samples/css-media-query/expected.js
@@ -1,4 +1,6 @@
-import { appendNode, assign, createElement, detachNode, insertNode, noop, proto, setAttribute } from "svelte/shared.js";
+/* generated by Svelte v1.39.3 */
+
+import { appendNode, assign, createElement, detachNode, init, insertNode, noop, proto, setAttribute } from "svelte/shared.js";
 
 function encapsulateStyles(node) {
 	setAttribute(node, "svelte-2363328337", "");
@@ -39,20 +41,9 @@ function create_main_fragment(state, component) {
 }
 
 function SvelteComponent(options) {
-	this.options = options;
+	init(this, options);
 	this._state = options.data || {};
 
-	this._observers = {
-		pre: Object.create(null),
-		post: Object.create(null)
-	};
-
-	this._handlers = Object.create(null);
-
-	this._root = options._root || this;
-	this._yield = options._yield;
-	this._bind = options._bind;
-
 	if (!document.getElementById("svelte-2363328337-style")) add_css();
 
 	this._fragment = create_main_fragment(this._state, this);
diff --git a/test/js/samples/css-shadow-dom-keyframes/expected-bundle.js b/test/js/samples/css-shadow-dom-keyframes/expected-bundle.js
index 8e3fa4e47f..7e04a00dd9 100644
--- a/test/js/samples/css-shadow-dom-keyframes/expected-bundle.js
+++ b/test/js/samples/css-shadow-dom-keyframes/expected-bundle.js
@@ -33,6 +33,10 @@ function createText(data) {
 	return document.createTextNode(data);
 }
 
+function blankObject() {
+	return Object.create(null);
+}
+
 function destroy(detach) {
 	this.destroy = noop;
 	this.fire('destroy');
@@ -68,10 +72,6 @@ function dispatchObservers(component, group, changed, newState, oldState) {
 	}
 }
 
-function get(key) {
-	return key ? this._state[key] : this._state;
-}
-
 function fire(eventName, data) {
 	var handlers =
 		eventName in this._handlers && this._handlers[eventName].slice();
@@ -82,6 +82,20 @@ function fire(eventName, data) {
 	}
 }
 
+function get(key) {
+	return key ? this._state[key] : this._state;
+}
+
+function init(component, options) {
+	component.options = options;
+
+	component._observers = { pre: blankObject(), post: blankObject() };
+	component._handlers = blankObject();
+	component._root = options._root || component;
+	component._yield = options._yield;
+	component._bind = options._bind;
+}
+
 function observe(key, callback, options) {
 	var group = options && options.defer
 		? this._observers.post
@@ -171,6 +185,8 @@ var proto = {
 	_unmount: _unmount
 };
 
+/* generated by Svelte v1.39.3 */
+
 function create_main_fragment(state, component) {
 	var div, text;
 
@@ -198,20 +214,9 @@ function create_main_fragment(state, component) {
 class SvelteComponent extends HTMLElement {
 	constructor(options = {}) {
 		super();
-		this.options = options;
+		init(this, options);
 		this._state = options.data || {};
 
-		this._observers = {
-			pre: Object.create(null),
-			post: Object.create(null)
-		};
-
-		this._handlers = Object.create(null);
-
-		this._root = options._root || this;
-		this._yield = options._yield;
-		this._bind = options._bind;
-
 		this.attachShadow({ mode: 'open' });
 		this.shadowRoot.innerHTML = `<style>div{animation:foo 1s}@keyframes foo{0%{opacity:0}100%{opacity:1}}</style>`;
 
diff --git a/test/js/samples/css-shadow-dom-keyframes/expected.js b/test/js/samples/css-shadow-dom-keyframes/expected.js
index 87cf2940bd..6d0b37f175 100644
--- a/test/js/samples/css-shadow-dom-keyframes/expected.js
+++ b/test/js/samples/css-shadow-dom-keyframes/expected.js
@@ -1,4 +1,6 @@
-import { appendNode, assign, createElement, createText, detachNode, insertNode, noop, proto } from "svelte/shared.js";
+/* generated by Svelte v1.39.3 */
+
+import { appendNode, assign, createElement, createText, detachNode, init, insertNode, noop, proto } from "svelte/shared.js";
 
 function create_main_fragment(state, component) {
 	var div, text;
@@ -27,20 +29,9 @@ function create_main_fragment(state, component) {
 class SvelteComponent extends HTMLElement {
 	constructor(options = {}) {
 		super();
-		this.options = options;
+		init(this, options);
 		this._state = options.data || {};
 
-		this._observers = {
-			pre: Object.create(null),
-			post: Object.create(null)
-		};
-
-		this._handlers = Object.create(null);
-
-		this._root = options._root || this;
-		this._yield = options._yield;
-		this._bind = options._bind;
-
 		this.attachShadow({ mode: 'open' });
 		this.shadowRoot.innerHTML = `<style>div{animation:foo 1s}@keyframes foo{0%{opacity:0}100%{opacity:1}}</style>`;
 
diff --git a/test/js/samples/each-block-changed-check/expected-bundle.js b/test/js/samples/each-block-changed-check/expected-bundle.js
index 28bd3c608d..f69d691333 100644
--- a/test/js/samples/each-block-changed-check/expected-bundle.js
+++ b/test/js/samples/each-block-changed-check/expected-bundle.js
@@ -46,6 +46,10 @@ function createText(data) {
 	return document.createTextNode(data);
 }
 
+function blankObject() {
+	return Object.create(null);
+}
+
 function destroy(detach) {
 	this.destroy = noop;
 	this.fire('destroy');
@@ -81,10 +85,6 @@ function dispatchObservers(component, group, changed, newState, oldState) {
 	}
 }
 
-function get(key) {
-	return key ? this._state[key] : this._state;
-}
-
 function fire(eventName, data) {
 	var handlers =
 		eventName in this._handlers && this._handlers[eventName].slice();
@@ -95,6 +95,20 @@ function fire(eventName, data) {
 	}
 }
 
+function get(key) {
+	return key ? this._state[key] : this._state;
+}
+
+function init(component, options) {
+	component.options = options;
+
+	component._observers = { pre: blankObject(), post: blankObject() };
+	component._handlers = blankObject();
+	component._root = options._root || component;
+	component._yield = options._yield;
+	component._bind = options._bind;
+}
+
 function observe(key, callback, options) {
 	var group = options && options.defer
 		? this._observers.post
@@ -184,6 +198,8 @@ var proto = {
 	_unmount: _unmount
 };
 
+/* generated by Svelte v1.39.3 */
+
 function create_main_fragment(state, component) {
 	var text, p, text_1;
 
@@ -237,7 +253,7 @@ function create_main_fragment(state, component) {
 				each_block_iterations.length = each_block_value.length;
 			}
 
-			if ( changed.foo ) {
+			if (changed.foo) {
 				text_1.data = state.foo;
 			}
 		},
@@ -257,6 +273,7 @@ function create_main_fragment(state, component) {
 	};
 }
 
+// (1:0) {{#each comments as comment, i}}
 function create_each_block(state, each_block_value, comment, i, component) {
 	var div, strong, text, text_1, span, text_2_value = comment.author, text_2, text_3, text_4_value = state.elapsed(comment.time, state.time), text_4, text_5, text_6, raw_value = comment.html, raw_before;
 
@@ -297,15 +314,15 @@ function create_each_block(state, each_block_value, comment, i, component) {
 		},
 
 		update: function(changed, state, each_block_value, comment, i) {
-			if ( (changed.comments) && text_2_value !== (text_2_value = comment.author) ) {
+			if ((changed.comments) && text_2_value !== (text_2_value = comment.author)) {
 				text_2.data = text_2_value;
 			}
 
-			if ( (changed.elapsed || changed.comments || changed.time) && text_4_value !== (text_4_value = state.elapsed(comment.time, state.time)) ) {
+			if ((changed.elapsed || changed.comments || changed.time) && text_4_value !== (text_4_value = state.elapsed(comment.time, state.time))) {
 				text_4.data = text_4_value;
 			}
 
-			if ( (changed.comments) && raw_value !== (raw_value = comment.html) ) {
+			if ((changed.comments) && raw_value !== (raw_value = comment.html)) {
 				detachAfter(raw_before);
 				raw_before.insertAdjacentHTML("afterend", raw_value);
 			}
@@ -322,20 +339,9 @@ function create_each_block(state, each_block_value, comment, i, component) {
 }
 
 function SvelteComponent(options) {
-	this.options = options;
+	init(this, options);
 	this._state = options.data || {};
 
-	this._observers = {
-		pre: Object.create(null),
-		post: Object.create(null)
-	};
-
-	this._handlers = Object.create(null);
-
-	this._root = options._root || this;
-	this._yield = options._yield;
-	this._bind = options._bind;
-
 	this._fragment = create_main_fragment(this._state, this);
 
 	if (options.target) {
diff --git a/test/js/samples/each-block-changed-check/expected.js b/test/js/samples/each-block-changed-check/expected.js
index 5fec542b69..5b30d091fc 100644
--- a/test/js/samples/each-block-changed-check/expected.js
+++ b/test/js/samples/each-block-changed-check/expected.js
@@ -1,4 +1,6 @@
-import { appendNode, assign, createElement, createText, destroyEach, detachAfter, detachNode, insertNode, noop, proto } from "svelte/shared.js";
+/* generated by Svelte v1.39.3 */
+
+import { appendNode, assign, createElement, createText, destroyEach, detachAfter, detachNode, init, insertNode, noop, proto } from "svelte/shared.js";
 
 function create_main_fragment(state, component) {
 	var text, p, text_1;
@@ -53,7 +55,7 @@ function create_main_fragment(state, component) {
 				each_block_iterations.length = each_block_value.length;
 			}
 
-			if ( changed.foo ) {
+			if (changed.foo) {
 				text_1.data = state.foo;
 			}
 		},
@@ -73,6 +75,7 @@ function create_main_fragment(state, component) {
 	};
 }
 
+// (1:0) {{#each comments as comment, i}}
 function create_each_block(state, each_block_value, comment, i, component) {
 	var div, strong, text, text_1, span, text_2_value = comment.author, text_2, text_3, text_4_value = state.elapsed(comment.time, state.time), text_4, text_5, text_6, raw_value = comment.html, raw_before;
 
@@ -113,15 +116,15 @@ function create_each_block(state, each_block_value, comment, i, component) {
 		},
 
 		update: function(changed, state, each_block_value, comment, i) {
-			if ( (changed.comments) && text_2_value !== (text_2_value = comment.author) ) {
+			if ((changed.comments) && text_2_value !== (text_2_value = comment.author)) {
 				text_2.data = text_2_value;
 			}
 
-			if ( (changed.elapsed || changed.comments || changed.time) && text_4_value !== (text_4_value = state.elapsed(comment.time, state.time)) ) {
+			if ((changed.elapsed || changed.comments || changed.time) && text_4_value !== (text_4_value = state.elapsed(comment.time, state.time))) {
 				text_4.data = text_4_value;
 			}
 
-			if ( (changed.comments) && raw_value !== (raw_value = comment.html) ) {
+			if ((changed.comments) && raw_value !== (raw_value = comment.html)) {
 				detachAfter(raw_before);
 				raw_before.insertAdjacentHTML("afterend", raw_value);
 			}
@@ -138,20 +141,9 @@ function create_each_block(state, each_block_value, comment, i, component) {
 }
 
 function SvelteComponent(options) {
-	this.options = options;
+	init(this, options);
 	this._state = options.data || {};
 
-	this._observers = {
-		pre: Object.create(null),
-		post: Object.create(null)
-	};
-
-	this._handlers = Object.create(null);
-
-	this._root = options._root || this;
-	this._yield = options._yield;
-	this._bind = options._bind;
-
 	this._fragment = create_main_fragment(this._state, this);
 
 	if (options.target) {
diff --git a/test/js/samples/event-handlers-custom/expected-bundle.js b/test/js/samples/event-handlers-custom/expected-bundle.js
index 9a683c9dab..022592786b 100644
--- a/test/js/samples/event-handlers-custom/expected-bundle.js
+++ b/test/js/samples/event-handlers-custom/expected-bundle.js
@@ -33,6 +33,10 @@ function createText(data) {
 	return document.createTextNode(data);
 }
 
+function blankObject() {
+	return Object.create(null);
+}
+
 function destroy(detach) {
 	this.destroy = noop;
 	this.fire('destroy');
@@ -68,10 +72,6 @@ function dispatchObservers(component, group, changed, newState, oldState) {
 	}
 }
 
-function get(key) {
-	return key ? this._state[key] : this._state;
-}
-
 function fire(eventName, data) {
 	var handlers =
 		eventName in this._handlers && this._handlers[eventName].slice();
@@ -82,6 +82,20 @@ function fire(eventName, data) {
 	}
 }
 
+function get(key) {
+	return key ? this._state[key] : this._state;
+}
+
+function init(component, options) {
+	component.options = options;
+
+	component._observers = { pre: blankObject(), post: blankObject() };
+	component._handlers = blankObject();
+	component._root = options._root || component;
+	component._yield = options._yield;
+	component._bind = options._bind;
+}
+
 function observe(key, callback, options) {
 	var group = options && options.defer
 		? this._observers.post
@@ -171,6 +185,8 @@ var proto = {
 	_unmount: _unmount
 };
 
+/* generated by Svelte v1.39.3 */
+
 var template = (function() {
 	return {
 		methods: {
@@ -221,20 +237,9 @@ function create_main_fragment(state, component) {
 }
 
 function SvelteComponent(options) {
-	this.options = options;
+	init(this, options);
 	this._state = options.data || {};
 
-	this._observers = {
-		pre: Object.create(null),
-		post: Object.create(null)
-	};
-
-	this._handlers = Object.create(null);
-
-	this._root = options._root || this;
-	this._yield = options._yield;
-	this._bind = options._bind;
-
 	this._fragment = create_main_fragment(this._state, this);
 
 	if (options.target) {
diff --git a/test/js/samples/event-handlers-custom/expected.js b/test/js/samples/event-handlers-custom/expected.js
index e123de9c98..cf2bf6a8ec 100644
--- a/test/js/samples/event-handlers-custom/expected.js
+++ b/test/js/samples/event-handlers-custom/expected.js
@@ -1,4 +1,6 @@
-import { appendNode, assign, createElement, createText, detachNode, insertNode, noop, proto } from "svelte/shared.js";
+/* generated by Svelte v1.39.3 */
+
+import { appendNode, assign, createElement, createText, detachNode, init, insertNode, noop, proto } from "svelte/shared.js";
 
 var template = (function() {
 	return {
@@ -50,20 +52,9 @@ function create_main_fragment(state, component) {
 }
 
 function SvelteComponent(options) {
-	this.options = options;
+	init(this, options);
 	this._state = options.data || {};
 
-	this._observers = {
-		pre: Object.create(null),
-		post: Object.create(null)
-	};
-
-	this._handlers = Object.create(null);
-
-	this._root = options._root || this;
-	this._yield = options._yield;
-	this._bind = options._bind;
-
 	this._fragment = create_main_fragment(this._state, this);
 
 	if (options.target) {
diff --git a/test/js/samples/if-block-no-update/expected-bundle.js b/test/js/samples/if-block-no-update/expected-bundle.js
index 00418f43cc..8f91bf4175 100644
--- a/test/js/samples/if-block-no-update/expected-bundle.js
+++ b/test/js/samples/if-block-no-update/expected-bundle.js
@@ -37,6 +37,10 @@ function createComment() {
 	return document.createComment('');
 }
 
+function blankObject() {
+	return Object.create(null);
+}
+
 function destroy(detach) {
 	this.destroy = noop;
 	this.fire('destroy');
@@ -72,10 +76,6 @@ function dispatchObservers(component, group, changed, newState, oldState) {
 	}
 }
 
-function get(key) {
-	return key ? this._state[key] : this._state;
-}
-
 function fire(eventName, data) {
 	var handlers =
 		eventName in this._handlers && this._handlers[eventName].slice();
@@ -86,6 +86,20 @@ function fire(eventName, data) {
 	}
 }
 
+function get(key) {
+	return key ? this._state[key] : this._state;
+}
+
+function init(component, options) {
+	component.options = options;
+
+	component._observers = { pre: blankObject(), post: blankObject() };
+	component._handlers = blankObject();
+	component._root = options._root || component;
+	component._yield = options._yield;
+	component._bind = options._bind;
+}
+
 function observe(key, callback, options) {
 	var group = options && options.defer
 		? this._observers.post
@@ -175,6 +189,8 @@ var proto = {
 	_unmount: _unmount
 };
 
+/* generated by Svelte v1.39.3 */
+
 function create_main_fragment(state, component) {
 	var if_block_anchor;
 
@@ -213,6 +229,7 @@ function create_main_fragment(state, component) {
 	};
 }
 
+// (1:0) {{#if foo}}
 function create_if_block(state, component) {
 	var p, text;
 
@@ -235,6 +252,7 @@ function create_if_block(state, component) {
 	};
 }
 
+// (3:0) {{else}}
 function create_if_block_1(state, component) {
 	var p, text;
 
@@ -263,20 +281,9 @@ function select_block_type(state) {
 }
 
 function SvelteComponent(options) {
-	this.options = options;
+	init(this, options);
 	this._state = options.data || {};
 
-	this._observers = {
-		pre: Object.create(null),
-		post: Object.create(null)
-	};
-
-	this._handlers = Object.create(null);
-
-	this._root = options._root || this;
-	this._yield = options._yield;
-	this._bind = options._bind;
-
 	this._fragment = create_main_fragment(this._state, this);
 
 	if (options.target) {
diff --git a/test/js/samples/if-block-no-update/expected.js b/test/js/samples/if-block-no-update/expected.js
index 619465c331..82e090d93e 100644
--- a/test/js/samples/if-block-no-update/expected.js
+++ b/test/js/samples/if-block-no-update/expected.js
@@ -1,4 +1,6 @@
-import { appendNode, assign, createComment, createElement, createText, detachNode, insertNode, noop, proto } from "svelte/shared.js";
+/* generated by Svelte v1.39.3 */
+
+import { appendNode, assign, createComment, createElement, createText, detachNode, init, insertNode, noop, proto } from "svelte/shared.js";
 
 function create_main_fragment(state, component) {
 	var if_block_anchor;
@@ -38,6 +40,7 @@ function create_main_fragment(state, component) {
 	};
 }
 
+// (1:0) {{#if foo}}
 function create_if_block(state, component) {
 	var p, text;
 
@@ -60,6 +63,7 @@ function create_if_block(state, component) {
 	};
 }
 
+// (3:0) {{else}}
 function create_if_block_1(state, component) {
 	var p, text;
 
@@ -88,20 +92,9 @@ function select_block_type(state) {
 }
 
 function SvelteComponent(options) {
-	this.options = options;
+	init(this, options);
 	this._state = options.data || {};
 
-	this._observers = {
-		pre: Object.create(null),
-		post: Object.create(null)
-	};
-
-	this._handlers = Object.create(null);
-
-	this._root = options._root || this;
-	this._yield = options._yield;
-	this._bind = options._bind;
-
 	this._fragment = create_main_fragment(this._state, this);
 
 	if (options.target) {
diff --git a/test/js/samples/if-block-simple/expected-bundle.js b/test/js/samples/if-block-simple/expected-bundle.js
index 6798ecce54..7007f2830f 100644
--- a/test/js/samples/if-block-simple/expected-bundle.js
+++ b/test/js/samples/if-block-simple/expected-bundle.js
@@ -37,6 +37,10 @@ function createComment() {
 	return document.createComment('');
 }
 
+function blankObject() {
+	return Object.create(null);
+}
+
 function destroy(detach) {
 	this.destroy = noop;
 	this.fire('destroy');
@@ -72,10 +76,6 @@ function dispatchObservers(component, group, changed, newState, oldState) {
 	}
 }
 
-function get(key) {
-	return key ? this._state[key] : this._state;
-}
-
 function fire(eventName, data) {
 	var handlers =
 		eventName in this._handlers && this._handlers[eventName].slice();
@@ -86,6 +86,20 @@ function fire(eventName, data) {
 	}
 }
 
+function get(key) {
+	return key ? this._state[key] : this._state;
+}
+
+function init(component, options) {
+	component.options = options;
+
+	component._observers = { pre: blankObject(), post: blankObject() };
+	component._handlers = blankObject();
+	component._root = options._root || component;
+	component._yield = options._yield;
+	component._bind = options._bind;
+}
+
 function observe(key, callback, options) {
 	var group = options && options.defer
 		? this._observers.post
@@ -175,6 +189,8 @@ var proto = {
 	_unmount: _unmount
 };
 
+/* generated by Svelte v1.39.3 */
+
 function create_main_fragment(state, component) {
 	var if_block_anchor;
 
@@ -216,6 +232,7 @@ function create_main_fragment(state, component) {
 	};
 }
 
+// (1:0) {{#if foo}}
 function create_if_block(state, component) {
 	var p, text;
 
@@ -239,20 +256,9 @@ function create_if_block(state, component) {
 }
 
 function SvelteComponent(options) {
-	this.options = options;
+	init(this, options);
 	this._state = options.data || {};
 
-	this._observers = {
-		pre: Object.create(null),
-		post: Object.create(null)
-	};
-
-	this._handlers = Object.create(null);
-
-	this._root = options._root || this;
-	this._yield = options._yield;
-	this._bind = options._bind;
-
 	this._fragment = create_main_fragment(this._state, this);
 
 	if (options.target) {
diff --git a/test/js/samples/if-block-simple/expected.js b/test/js/samples/if-block-simple/expected.js
index f003447f3b..53cf640760 100644
--- a/test/js/samples/if-block-simple/expected.js
+++ b/test/js/samples/if-block-simple/expected.js
@@ -1,4 +1,6 @@
-import { appendNode, assign, createComment, createElement, createText, detachNode, insertNode, noop, proto } from "svelte/shared.js";
+/* generated by Svelte v1.39.3 */
+
+import { appendNode, assign, createComment, createElement, createText, detachNode, init, insertNode, noop, proto } from "svelte/shared.js";
 
 function create_main_fragment(state, component) {
 	var if_block_anchor;
@@ -41,6 +43,7 @@ function create_main_fragment(state, component) {
 	};
 }
 
+// (1:0) {{#if foo}}
 function create_if_block(state, component) {
 	var p, text;
 
@@ -64,20 +67,9 @@ function create_if_block(state, component) {
 }
 
 function SvelteComponent(options) {
-	this.options = options;
+	init(this, options);
 	this._state = options.data || {};
 
-	this._observers = {
-		pre: Object.create(null),
-		post: Object.create(null)
-	};
-
-	this._handlers = Object.create(null);
-
-	this._root = options._root || this;
-	this._yield = options._yield;
-	this._bind = options._bind;
-
 	this._fragment = create_main_fragment(this._state, this);
 
 	if (options.target) {
diff --git a/test/js/samples/inline-style-optimized-multiple/expected-bundle.js b/test/js/samples/inline-style-optimized-multiple/expected-bundle.js
index 019bf5e86b..6142c14afd 100644
--- a/test/js/samples/inline-style-optimized-multiple/expected-bundle.js
+++ b/test/js/samples/inline-style-optimized-multiple/expected-bundle.js
@@ -29,6 +29,10 @@ function setStyle(node, key, value) {
 	node.style.setProperty(key, value);
 }
 
+function blankObject() {
+	return Object.create(null);
+}
+
 function destroy(detach) {
 	this.destroy = noop;
 	this.fire('destroy');
@@ -64,10 +68,6 @@ function dispatchObservers(component, group, changed, newState, oldState) {
 	}
 }
 
-function get(key) {
-	return key ? this._state[key] : this._state;
-}
-
 function fire(eventName, data) {
 	var handlers =
 		eventName in this._handlers && this._handlers[eventName].slice();
@@ -78,6 +78,20 @@ function fire(eventName, data) {
 	}
 }
 
+function get(key) {
+	return key ? this._state[key] : this._state;
+}
+
+function init(component, options) {
+	component.options = options;
+
+	component._observers = { pre: blankObject(), post: blankObject() };
+	component._handlers = blankObject();
+	component._root = options._root || component;
+	component._yield = options._yield;
+	component._bind = options._bind;
+}
+
 function observe(key, callback, options) {
 	var group = options && options.defer
 		? this._observers.post
@@ -167,6 +181,8 @@ var proto = {
 	_unmount: _unmount
 };
 
+/* generated by Svelte v1.39.3 */
+
 function create_main_fragment(state, component) {
 	var div;
 
@@ -186,11 +202,11 @@ function create_main_fragment(state, component) {
 		},
 
 		update: function(changed, state) {
-			if ( changed.color ) {
+			if (changed.color) {
 				setStyle(div, "color", state.color);
 			}
 
-			if ( changed.x || changed.y ) {
+			if (changed.x || changed.y) {
 				setStyle(div, "transform", "translate(" + state.x + "px," + state.y + "px)");
 			}
 		},
@@ -204,20 +220,9 @@ function create_main_fragment(state, component) {
 }
 
 function SvelteComponent(options) {
-	this.options = options;
+	init(this, options);
 	this._state = options.data || {};
 
-	this._observers = {
-		pre: Object.create(null),
-		post: Object.create(null)
-	};
-
-	this._handlers = Object.create(null);
-
-	this._root = options._root || this;
-	this._yield = options._yield;
-	this._bind = options._bind;
-
 	this._fragment = create_main_fragment(this._state, this);
 
 	if (options.target) {
diff --git a/test/js/samples/inline-style-optimized-multiple/expected.js b/test/js/samples/inline-style-optimized-multiple/expected.js
index 540cee99bc..51f7499383 100644
--- a/test/js/samples/inline-style-optimized-multiple/expected.js
+++ b/test/js/samples/inline-style-optimized-multiple/expected.js
@@ -1,4 +1,6 @@
-import { assign, createElement, detachNode, insertNode, noop, proto, setStyle } from "svelte/shared.js";
+/* generated by Svelte v1.39.3 */
+
+import { assign, createElement, detachNode, init, insertNode, noop, proto, setStyle } from "svelte/shared.js";
 
 function create_main_fragment(state, component) {
 	var div;
@@ -19,11 +21,11 @@ function create_main_fragment(state, component) {
 		},
 
 		update: function(changed, state) {
-			if ( changed.color ) {
+			if (changed.color) {
 				setStyle(div, "color", state.color);
 			}
 
-			if ( changed.x || changed.y ) {
+			if (changed.x || changed.y) {
 				setStyle(div, "transform", "translate(" + state.x + "px," + state.y + "px)");
 			}
 		},
@@ -37,20 +39,9 @@ function create_main_fragment(state, component) {
 }
 
 function SvelteComponent(options) {
-	this.options = options;
+	init(this, options);
 	this._state = options.data || {};
 
-	this._observers = {
-		pre: Object.create(null),
-		post: Object.create(null)
-	};
-
-	this._handlers = Object.create(null);
-
-	this._root = options._root || this;
-	this._yield = options._yield;
-	this._bind = options._bind;
-
 	this._fragment = create_main_fragment(this._state, this);
 
 	if (options.target) {
diff --git a/test/js/samples/inline-style-optimized-url/expected-bundle.js b/test/js/samples/inline-style-optimized-url/expected-bundle.js
index 05aa4df9d7..2ff763246a 100644
--- a/test/js/samples/inline-style-optimized-url/expected-bundle.js
+++ b/test/js/samples/inline-style-optimized-url/expected-bundle.js
@@ -29,6 +29,10 @@ function setStyle(node, key, value) {
 	node.style.setProperty(key, value);
 }
 
+function blankObject() {
+	return Object.create(null);
+}
+
 function destroy(detach) {
 	this.destroy = noop;
 	this.fire('destroy');
@@ -64,10 +68,6 @@ function dispatchObservers(component, group, changed, newState, oldState) {
 	}
 }
 
-function get(key) {
-	return key ? this._state[key] : this._state;
-}
-
 function fire(eventName, data) {
 	var handlers =
 		eventName in this._handlers && this._handlers[eventName].slice();
@@ -78,6 +78,20 @@ function fire(eventName, data) {
 	}
 }
 
+function get(key) {
+	return key ? this._state[key] : this._state;
+}
+
+function init(component, options) {
+	component.options = options;
+
+	component._observers = { pre: blankObject(), post: blankObject() };
+	component._handlers = blankObject();
+	component._root = options._root || component;
+	component._yield = options._yield;
+	component._bind = options._bind;
+}
+
 function observe(key, callback, options) {
 	var group = options && options.defer
 		? this._observers.post
@@ -167,6 +181,8 @@ var proto = {
 	_unmount: _unmount
 };
 
+/* generated by Svelte v1.39.3 */
+
 function create_main_fragment(state, component) {
 	var div;
 
@@ -185,7 +201,7 @@ function create_main_fragment(state, component) {
 		},
 
 		update: function(changed, state) {
-			if ( changed.data ) {
+			if (changed.data) {
 				setStyle(div, "background", "url(data:image/png;base64," + state.data + ")");
 			}
 		},
@@ -199,20 +215,9 @@ function create_main_fragment(state, component) {
 }
 
 function SvelteComponent(options) {
-	this.options = options;
+	init(this, options);
 	this._state = options.data || {};
 
-	this._observers = {
-		pre: Object.create(null),
-		post: Object.create(null)
-	};
-
-	this._handlers = Object.create(null);
-
-	this._root = options._root || this;
-	this._yield = options._yield;
-	this._bind = options._bind;
-
 	this._fragment = create_main_fragment(this._state, this);
 
 	if (options.target) {
diff --git a/test/js/samples/inline-style-optimized-url/expected.js b/test/js/samples/inline-style-optimized-url/expected.js
index d5d415aafd..f0ada0520b 100644
--- a/test/js/samples/inline-style-optimized-url/expected.js
+++ b/test/js/samples/inline-style-optimized-url/expected.js
@@ -1,4 +1,6 @@
-import { assign, createElement, detachNode, insertNode, noop, proto, setStyle } from "svelte/shared.js";
+/* generated by Svelte v1.39.3 */
+
+import { assign, createElement, detachNode, init, insertNode, noop, proto, setStyle } from "svelte/shared.js";
 
 function create_main_fragment(state, component) {
 	var div;
@@ -18,7 +20,7 @@ function create_main_fragment(state, component) {
 		},
 
 		update: function(changed, state) {
-			if ( changed.data ) {
+			if (changed.data) {
 				setStyle(div, "background", "url(data:image/png;base64," + state.data + ")");
 			}
 		},
@@ -32,20 +34,9 @@ function create_main_fragment(state, component) {
 }
 
 function SvelteComponent(options) {
-	this.options = options;
+	init(this, options);
 	this._state = options.data || {};
 
-	this._observers = {
-		pre: Object.create(null),
-		post: Object.create(null)
-	};
-
-	this._handlers = Object.create(null);
-
-	this._root = options._root || this;
-	this._yield = options._yield;
-	this._bind = options._bind;
-
 	this._fragment = create_main_fragment(this._state, this);
 
 	if (options.target) {
diff --git a/test/js/samples/inline-style-optimized/expected-bundle.js b/test/js/samples/inline-style-optimized/expected-bundle.js
index 91db41380b..554be56ba4 100644
--- a/test/js/samples/inline-style-optimized/expected-bundle.js
+++ b/test/js/samples/inline-style-optimized/expected-bundle.js
@@ -29,6 +29,10 @@ function setStyle(node, key, value) {
 	node.style.setProperty(key, value);
 }
 
+function blankObject() {
+	return Object.create(null);
+}
+
 function destroy(detach) {
 	this.destroy = noop;
 	this.fire('destroy');
@@ -64,10 +68,6 @@ function dispatchObservers(component, group, changed, newState, oldState) {
 	}
 }
 
-function get(key) {
-	return key ? this._state[key] : this._state;
-}
-
 function fire(eventName, data) {
 	var handlers =
 		eventName in this._handlers && this._handlers[eventName].slice();
@@ -78,6 +78,20 @@ function fire(eventName, data) {
 	}
 }
 
+function get(key) {
+	return key ? this._state[key] : this._state;
+}
+
+function init(component, options) {
+	component.options = options;
+
+	component._observers = { pre: blankObject(), post: blankObject() };
+	component._handlers = blankObject();
+	component._root = options._root || component;
+	component._yield = options._yield;
+	component._bind = options._bind;
+}
+
 function observe(key, callback, options) {
 	var group = options && options.defer
 		? this._observers.post
@@ -167,6 +181,8 @@ var proto = {
 	_unmount: _unmount
 };
 
+/* generated by Svelte v1.39.3 */
+
 function create_main_fragment(state, component) {
 	var div;
 
@@ -185,7 +201,7 @@ function create_main_fragment(state, component) {
 		},
 
 		update: function(changed, state) {
-			if ( changed.color ) {
+			if (changed.color) {
 				setStyle(div, "color", state.color);
 			}
 		},
@@ -199,20 +215,9 @@ function create_main_fragment(state, component) {
 }
 
 function SvelteComponent(options) {
-	this.options = options;
+	init(this, options);
 	this._state = options.data || {};
 
-	this._observers = {
-		pre: Object.create(null),
-		post: Object.create(null)
-	};
-
-	this._handlers = Object.create(null);
-
-	this._root = options._root || this;
-	this._yield = options._yield;
-	this._bind = options._bind;
-
 	this._fragment = create_main_fragment(this._state, this);
 
 	if (options.target) {
diff --git a/test/js/samples/inline-style-optimized/expected.js b/test/js/samples/inline-style-optimized/expected.js
index e4816ffbfb..333020c739 100644
--- a/test/js/samples/inline-style-optimized/expected.js
+++ b/test/js/samples/inline-style-optimized/expected.js
@@ -1,4 +1,6 @@
-import { assign, createElement, detachNode, insertNode, noop, proto, setStyle } from "svelte/shared.js";
+/* generated by Svelte v1.39.3 */
+
+import { assign, createElement, detachNode, init, insertNode, noop, proto, setStyle } from "svelte/shared.js";
 
 function create_main_fragment(state, component) {
 	var div;
@@ -18,7 +20,7 @@ function create_main_fragment(state, component) {
 		},
 
 		update: function(changed, state) {
-			if ( changed.color ) {
+			if (changed.color) {
 				setStyle(div, "color", state.color);
 			}
 		},
@@ -32,20 +34,9 @@ function create_main_fragment(state, component) {
 }
 
 function SvelteComponent(options) {
-	this.options = options;
+	init(this, options);
 	this._state = options.data || {};
 
-	this._observers = {
-		pre: Object.create(null),
-		post: Object.create(null)
-	};
-
-	this._handlers = Object.create(null);
-
-	this._root = options._root || this;
-	this._yield = options._yield;
-	this._bind = options._bind;
-
 	this._fragment = create_main_fragment(this._state, this);
 
 	if (options.target) {
diff --git a/test/js/samples/inline-style-unoptimized/expected-bundle.js b/test/js/samples/inline-style-unoptimized/expected-bundle.js
index cfe849e3f9..5ab9d5db50 100644
--- a/test/js/samples/inline-style-unoptimized/expected-bundle.js
+++ b/test/js/samples/inline-style-unoptimized/expected-bundle.js
@@ -29,6 +29,10 @@ function createText(data) {
 	return document.createTextNode(data);
 }
 
+function blankObject() {
+	return Object.create(null);
+}
+
 function destroy(detach) {
 	this.destroy = noop;
 	this.fire('destroy');
@@ -64,10 +68,6 @@ function dispatchObservers(component, group, changed, newState, oldState) {
 	}
 }
 
-function get(key) {
-	return key ? this._state[key] : this._state;
-}
-
 function fire(eventName, data) {
 	var handlers =
 		eventName in this._handlers && this._handlers[eventName].slice();
@@ -78,6 +78,20 @@ function fire(eventName, data) {
 	}
 }
 
+function get(key) {
+	return key ? this._state[key] : this._state;
+}
+
+function init(component, options) {
+	component.options = options;
+
+	component._observers = { pre: blankObject(), post: blankObject() };
+	component._handlers = blankObject();
+	component._root = options._root || component;
+	component._yield = options._yield;
+	component._bind = options._bind;
+}
+
 function observe(key, callback, options) {
 	var group = options && options.defer
 		? this._observers.post
@@ -167,6 +181,8 @@ var proto = {
 	_unmount: _unmount
 };
 
+/* generated by Svelte v1.39.3 */
+
 function create_main_fragment(state, component) {
 	var div, text, div_1, div_1_style_value;
 
@@ -190,11 +206,11 @@ function create_main_fragment(state, component) {
 		},
 
 		update: function(changed, state) {
-			if ( changed.style ) {
+			if (changed.style) {
 				div.style.cssText = state.style;
 			}
 
-			if ( (changed.key || changed.value) && div_1_style_value !== (div_1_style_value = "" + state.key + ": " + state.value) ) {
+			if ((changed.key || changed.value) && div_1_style_value !== (div_1_style_value = "" + state.key + ": " + state.value)) {
 				div_1.style.cssText = div_1_style_value;
 			}
 		},
@@ -210,20 +226,9 @@ function create_main_fragment(state, component) {
 }
 
 function SvelteComponent(options) {
-	this.options = options;
+	init(this, options);
 	this._state = options.data || {};
 
-	this._observers = {
-		pre: Object.create(null),
-		post: Object.create(null)
-	};
-
-	this._handlers = Object.create(null);
-
-	this._root = options._root || this;
-	this._yield = options._yield;
-	this._bind = options._bind;
-
 	this._fragment = create_main_fragment(this._state, this);
 
 	if (options.target) {
diff --git a/test/js/samples/inline-style-unoptimized/expected.js b/test/js/samples/inline-style-unoptimized/expected.js
index 209cc90df6..e61085cb37 100644
--- a/test/js/samples/inline-style-unoptimized/expected.js
+++ b/test/js/samples/inline-style-unoptimized/expected.js
@@ -1,4 +1,6 @@
-import { assign, createElement, createText, detachNode, insertNode, noop, proto } from "svelte/shared.js";
+/* generated by Svelte v1.39.3 */
+
+import { assign, createElement, createText, detachNode, init, insertNode, noop, proto } from "svelte/shared.js";
 
 function create_main_fragment(state, component) {
 	var div, text, div_1, div_1_style_value;
@@ -23,11 +25,11 @@ function create_main_fragment(state, component) {
 		},
 
 		update: function(changed, state) {
-			if ( changed.style ) {
+			if (changed.style) {
 				div.style.cssText = state.style;
 			}
 
-			if ( (changed.key || changed.value) && div_1_style_value !== (div_1_style_value = "" + state.key + ": " + state.value) ) {
+			if ((changed.key || changed.value) && div_1_style_value !== (div_1_style_value = "" + state.key + ": " + state.value)) {
 				div_1.style.cssText = div_1_style_value;
 			}
 		},
@@ -43,20 +45,9 @@ function create_main_fragment(state, component) {
 }
 
 function SvelteComponent(options) {
-	this.options = options;
+	init(this, options);
 	this._state = options.data || {};
 
-	this._observers = {
-		pre: Object.create(null),
-		post: Object.create(null)
-	};
-
-	this._handlers = Object.create(null);
-
-	this._root = options._root || this;
-	this._yield = options._yield;
-	this._bind = options._bind;
-
 	this._fragment = create_main_fragment(this._state, this);
 
 	if (options.target) {
diff --git a/test/js/samples/input-without-blowback-guard/expected-bundle.js b/test/js/samples/input-without-blowback-guard/expected-bundle.js
index c5cfd84bec..b1c6c3b8e5 100644
--- a/test/js/samples/input-without-blowback-guard/expected-bundle.js
+++ b/test/js/samples/input-without-blowback-guard/expected-bundle.js
@@ -33,6 +33,10 @@ function removeListener(node, event, handler) {
 	node.removeEventListener(event, handler, false);
 }
 
+function blankObject() {
+	return Object.create(null);
+}
+
 function destroy(detach) {
 	this.destroy = noop;
 	this.fire('destroy');
@@ -68,10 +72,6 @@ function dispatchObservers(component, group, changed, newState, oldState) {
 	}
 }
 
-function get(key) {
-	return key ? this._state[key] : this._state;
-}
-
 function fire(eventName, data) {
 	var handlers =
 		eventName in this._handlers && this._handlers[eventName].slice();
@@ -82,6 +82,20 @@ function fire(eventName, data) {
 	}
 }
 
+function get(key) {
+	return key ? this._state[key] : this._state;
+}
+
+function init(component, options) {
+	component.options = options;
+
+	component._observers = { pre: blankObject(), post: blankObject() };
+	component._handlers = blankObject();
+	component._root = options._root || component;
+	component._yield = options._yield;
+	component._bind = options._bind;
+}
+
 function observe(key, callback, options) {
 	var group = options && options.defer
 		? this._observers.post
@@ -171,6 +185,8 @@ var proto = {
 	_unmount: _unmount
 };
 
+/* generated by Svelte v1.39.3 */
+
 function create_main_fragment(state, component) {
 	var input;
 
@@ -210,20 +226,9 @@ function create_main_fragment(state, component) {
 }
 
 function SvelteComponent(options) {
-	this.options = options;
+	init(this, options);
 	this._state = options.data || {};
 
-	this._observers = {
-		pre: Object.create(null),
-		post: Object.create(null)
-	};
-
-	this._handlers = Object.create(null);
-
-	this._root = options._root || this;
-	this._yield = options._yield;
-	this._bind = options._bind;
-
 	this._fragment = create_main_fragment(this._state, this);
 
 	if (options.target) {
diff --git a/test/js/samples/input-without-blowback-guard/expected.js b/test/js/samples/input-without-blowback-guard/expected.js
index b459bdb7c8..ab01d04de3 100644
--- a/test/js/samples/input-without-blowback-guard/expected.js
+++ b/test/js/samples/input-without-blowback-guard/expected.js
@@ -1,4 +1,6 @@
-import { addListener, assign, createElement, detachNode, insertNode, proto, removeListener } from "svelte/shared.js";
+/* generated by Svelte v1.39.3 */
+
+import { addListener, assign, createElement, detachNode, init, insertNode, proto, removeListener } from "svelte/shared.js";
 
 function create_main_fragment(state, component) {
 	var input;
@@ -39,20 +41,9 @@ function create_main_fragment(state, component) {
 }
 
 function SvelteComponent(options) {
-	this.options = options;
+	init(this, options);
 	this._state = options.data || {};
 
-	this._observers = {
-		pre: Object.create(null),
-		post: Object.create(null)
-	};
-
-	this._handlers = Object.create(null);
-
-	this._root = options._root || this;
-	this._yield = options._yield;
-	this._bind = options._bind;
-
 	this._fragment = create_main_fragment(this._state, this);
 
 	if (options.target) {
diff --git a/test/js/samples/legacy-input-type/expected-bundle.js b/test/js/samples/legacy-input-type/expected-bundle.js
index f34e19450e..c950e0ddb1 100644
--- a/test/js/samples/legacy-input-type/expected-bundle.js
+++ b/test/js/samples/legacy-input-type/expected-bundle.js
@@ -31,6 +31,10 @@ function setInputType(input, type) {
 	} catch (e) {}
 }
 
+function blankObject() {
+	return Object.create(null);
+}
+
 function destroy(detach) {
 	this.destroy = noop;
 	this.fire('destroy');
@@ -66,10 +70,6 @@ function dispatchObservers(component, group, changed, newState, oldState) {
 	}
 }
 
-function get(key) {
-	return key ? this._state[key] : this._state;
-}
-
 function fire(eventName, data) {
 	var handlers =
 		eventName in this._handlers && this._handlers[eventName].slice();
@@ -80,6 +80,20 @@ function fire(eventName, data) {
 	}
 }
 
+function get(key) {
+	return key ? this._state[key] : this._state;
+}
+
+function init(component, options) {
+	component.options = options;
+
+	component._observers = { pre: blankObject(), post: blankObject() };
+	component._handlers = blankObject();
+	component._root = options._root || component;
+	component._yield = options._yield;
+	component._bind = options._bind;
+}
+
 function observe(key, callback, options) {
 	var group = options && options.defer
 		? this._observers.post
@@ -169,6 +183,8 @@ var proto = {
 	_unmount: _unmount
 };
 
+/* generated by Svelte v1.39.3 */
+
 function create_main_fragment(state, component) {
 	var input;
 
@@ -197,20 +213,9 @@ function create_main_fragment(state, component) {
 }
 
 function SvelteComponent(options) {
-	this.options = options;
+	init(this, options);
 	this._state = options.data || {};
 
-	this._observers = {
-		pre: Object.create(null),
-		post: Object.create(null)
-	};
-
-	this._handlers = Object.create(null);
-
-	this._root = options._root || this;
-	this._yield = options._yield;
-	this._bind = options._bind;
-
 	this._fragment = create_main_fragment(this._state, this);
 
 	if (options.target) {
diff --git a/test/js/samples/legacy-input-type/expected.js b/test/js/samples/legacy-input-type/expected.js
index 9f585862e1..082b8d3208 100644
--- a/test/js/samples/legacy-input-type/expected.js
+++ b/test/js/samples/legacy-input-type/expected.js
@@ -1,4 +1,6 @@
-import { assign, createElement, detachNode, insertNode, noop, proto, setInputType } from "svelte/shared.js";
+/* generated by Svelte v1.39.3 */
+
+import { assign, createElement, detachNode, init, insertNode, noop, proto, setInputType } from "svelte/shared.js";
 
 function create_main_fragment(state, component) {
 	var input;
@@ -28,20 +30,9 @@ function create_main_fragment(state, component) {
 }
 
 function SvelteComponent(options) {
-	this.options = options;
+	init(this, options);
 	this._state = options.data || {};
 
-	this._observers = {
-		pre: Object.create(null),
-		post: Object.create(null)
-	};
-
-	this._handlers = Object.create(null);
-
-	this._root = options._root || this;
-	this._yield = options._yield;
-	this._bind = options._bind;
-
 	this._fragment = create_main_fragment(this._state, this);
 
 	if (options.target) {
diff --git a/test/js/samples/legacy-quote-class/expected-bundle.js b/test/js/samples/legacy-quote-class/expected-bundle.js
index bf4bf86be9..9d0e225527 100644
--- a/test/js/samples/legacy-quote-class/expected-bundle.js
+++ b/test/js/samples/legacy-quote-class/expected-bundle.js
@@ -48,6 +48,10 @@ function claimElement (nodes, name, attributes, svg) {
 	return svg ? createSvgElement(name) : createElement(name);
 }
 
+function blankObject() {
+	return Object.create(null);
+}
+
 function destroy(detach) {
 	this.destroy = noop;
 	this.fire('destroy');
@@ -83,10 +87,6 @@ function dispatchObservers(component, group, changed, newState, oldState) {
 	}
 }
 
-function get(key) {
-	return key ? this._state[key] : this._state;
-}
-
 function fire(eventName, data) {
 	var handlers =
 		eventName in this._handlers && this._handlers[eventName].slice();
@@ -97,6 +97,20 @@ function fire(eventName, data) {
 	}
 }
 
+function get(key) {
+	return key ? this._state[key] : this._state;
+}
+
+function init(component, options) {
+	component.options = options;
+
+	component._observers = { pre: blankObject(), post: blankObject() };
+	component._handlers = blankObject();
+	component._root = options._root || component;
+	component._yield = options._yield;
+	component._bind = options._bind;
+}
+
 function observe(key, callback, options) {
 	var group = options && options.defer
 		? this._observers.post
@@ -186,6 +200,8 @@ var proto = {
 	_unmount: _unmount
 };
 
+/* generated by Svelte v1.39.3 */
+
 function create_main_fragment(state, component) {
 	var div;
 
@@ -222,20 +238,9 @@ function create_main_fragment(state, component) {
 }
 
 function SvelteComponent(options) {
-	this.options = options;
+	init(this, options);
 	this._state = options.data || {};
 
-	this._observers = {
-		pre: Object.create(null),
-		post: Object.create(null)
-	};
-
-	this._handlers = Object.create(null);
-
-	this._root = options._root || this;
-	this._yield = options._yield;
-	this._bind = options._bind;
-
 	this._fragment = create_main_fragment(this._state, this);
 
 	if (options.target) {
diff --git a/test/js/samples/legacy-quote-class/expected.js b/test/js/samples/legacy-quote-class/expected.js
index 7eec7950fd..09d185216e 100644
--- a/test/js/samples/legacy-quote-class/expected.js
+++ b/test/js/samples/legacy-quote-class/expected.js
@@ -1,4 +1,6 @@
-import { assign, children, claimElement, createElement, detachNode, insertNode, noop, proto } from "svelte/shared.js";
+/* generated by Svelte v1.39.3 */
+
+import { assign, children, claimElement, createElement, detachNode, init, insertNode, noop, proto } from "svelte/shared.js";
 
 function create_main_fragment(state, component) {
 	var div;
@@ -36,20 +38,9 @@ function create_main_fragment(state, component) {
 }
 
 function SvelteComponent(options) {
-	this.options = options;
+	init(this, options);
 	this._state = options.data || {};
 
-	this._observers = {
-		pre: Object.create(null),
-		post: Object.create(null)
-	};
-
-	this._handlers = Object.create(null);
-
-	this._root = options._root || this;
-	this._yield = options._yield;
-	this._bind = options._bind;
-
 	this._fragment = create_main_fragment(this._state, this);
 
 	if (options.target) {
diff --git a/test/js/samples/media-bindings/expected-bundle.js b/test/js/samples/media-bindings/expected-bundle.js
index 8dca649745..ce26e1ac63 100644
--- a/test/js/samples/media-bindings/expected-bundle.js
+++ b/test/js/samples/media-bindings/expected-bundle.js
@@ -41,6 +41,10 @@ function timeRangesToArray(ranges) {
 	return array;
 }
 
+function blankObject() {
+	return Object.create(null);
+}
+
 function destroy(detach) {
 	this.destroy = noop;
 	this.fire('destroy');
@@ -76,10 +80,6 @@ function dispatchObservers(component, group, changed, newState, oldState) {
 	}
 }
 
-function get(key) {
-	return key ? this._state[key] : this._state;
-}
-
 function fire(eventName, data) {
 	var handlers =
 		eventName in this._handlers && this._handlers[eventName].slice();
@@ -90,6 +90,20 @@ function fire(eventName, data) {
 	}
 }
 
+function get(key) {
+	return key ? this._state[key] : this._state;
+}
+
+function init(component, options) {
+	component.options = options;
+
+	component._observers = { pre: blankObject(), post: blankObject() };
+	component._handlers = blankObject();
+	component._root = options._root || component;
+	component._yield = options._yield;
+	component._bind = options._bind;
+}
+
 function observe(key, callback, options) {
 	var group = options && options.defer
 		? this._observers.post
@@ -179,6 +193,8 @@ var proto = {
 	_unmount: _unmount
 };
 
+/* generated by Svelte v1.39.3 */
+
 function create_main_fragment(state, component) {
 	var audio, audio_updating = false, audio_animationframe, audio_paused_value = true;
 
@@ -286,20 +302,9 @@ function create_main_fragment(state, component) {
 }
 
 function SvelteComponent(options) {
-	this.options = options;
+	init(this, options);
 	this._state = options.data || {};
 
-	this._observers = {
-		pre: Object.create(null),
-		post: Object.create(null)
-	};
-
-	this._handlers = Object.create(null);
-
-	this._root = options._root || this;
-	this._yield = options._yield;
-	this._bind = options._bind;
-
 	if (!options._root) {
 		this._oncreate = [];
 		this._beforecreate = [];
diff --git a/test/js/samples/media-bindings/expected.js b/test/js/samples/media-bindings/expected.js
index 738de4f815..ca7837c41c 100644
--- a/test/js/samples/media-bindings/expected.js
+++ b/test/js/samples/media-bindings/expected.js
@@ -1,4 +1,6 @@
-import { addListener, assign, callAll, createElement, detachNode, insertNode, proto, removeListener, timeRangesToArray } from "svelte/shared.js";
+/* generated by Svelte v1.39.3 */
+
+import { addListener, assign, callAll, createElement, detachNode, init, insertNode, proto, removeListener, timeRangesToArray } from "svelte/shared.js";
 
 function create_main_fragment(state, component) {
 	var audio, audio_updating = false, audio_animationframe, audio_paused_value = true;
@@ -107,20 +109,9 @@ function create_main_fragment(state, component) {
 }
 
 function SvelteComponent(options) {
-	this.options = options;
+	init(this, options);
 	this._state = options.data || {};
 
-	this._observers = {
-		pre: Object.create(null),
-		post: Object.create(null)
-	};
-
-	this._handlers = Object.create(null);
-
-	this._root = options._root || this;
-	this._yield = options._yield;
-	this._bind = options._bind;
-
 	if (!options._root) {
 		this._oncreate = [];
 		this._beforecreate = [];
diff --git a/test/js/samples/non-imported-component/expected-bundle.js b/test/js/samples/non-imported-component/expected-bundle.js
index 6d5ea4bba3..f1f284a01f 100644
--- a/test/js/samples/non-imported-component/expected-bundle.js
+++ b/test/js/samples/non-imported-component/expected-bundle.js
@@ -27,6 +27,10 @@ function createText(data) {
 	return document.createTextNode(data);
 }
 
+function blankObject() {
+	return Object.create(null);
+}
+
 function destroy(detach) {
 	this.destroy = noop;
 	this.fire('destroy');
@@ -62,10 +66,6 @@ function dispatchObservers(component, group, changed, newState, oldState) {
 	}
 }
 
-function get(key) {
-	return key ? this._state[key] : this._state;
-}
-
 function fire(eventName, data) {
 	var handlers =
 		eventName in this._handlers && this._handlers[eventName].slice();
@@ -76,6 +76,20 @@ function fire(eventName, data) {
 	}
 }
 
+function get(key) {
+	return key ? this._state[key] : this._state;
+}
+
+function init(component, options) {
+	component.options = options;
+
+	component._observers = { pre: blankObject(), post: blankObject() };
+	component._handlers = blankObject();
+	component._root = options._root || component;
+	component._yield = options._yield;
+	component._bind = options._bind;
+}
+
 function observe(key, callback, options) {
 	var group = options && options.defer
 		? this._observers.post
@@ -165,6 +179,8 @@ var proto = {
 	_unmount: _unmount
 };
 
+/* generated by Svelte v1.39.3 */
+
 var template = (function() {
 	return {
 		components: {
@@ -213,20 +229,9 @@ function create_main_fragment(state, component) {
 }
 
 function SvelteComponent(options) {
-	this.options = options;
+	init(this, options);
 	this._state = options.data || {};
 
-	this._observers = {
-		pre: Object.create(null),
-		post: Object.create(null)
-	};
-
-	this._handlers = Object.create(null);
-
-	this._root = options._root || this;
-	this._yield = options._yield;
-	this._bind = options._bind;
-
 	if (!options._root) {
 		this._oncreate = [];
 		this._beforecreate = [];
diff --git a/test/js/samples/non-imported-component/expected.js b/test/js/samples/non-imported-component/expected.js
index de96d252be..a7c1ad99a8 100644
--- a/test/js/samples/non-imported-component/expected.js
+++ b/test/js/samples/non-imported-component/expected.js
@@ -1,6 +1,8 @@
 import Imported from 'Imported.html';
 
-import { assign, callAll, createText, detachNode, insertNode, noop, proto } from "svelte/shared.js";
+/* generated by Svelte v1.39.3 */
+
+import { assign, callAll, createText, detachNode, init, insertNode, noop, proto } from "svelte/shared.js";
 
 var template = (function() {
 	return {
@@ -50,20 +52,9 @@ function create_main_fragment(state, component) {
 }
 
 function SvelteComponent(options) {
-	this.options = options;
+	init(this, options);
 	this._state = options.data || {};
 
-	this._observers = {
-		pre: Object.create(null),
-		post: Object.create(null)
-	};
-
-	this._handlers = Object.create(null);
-
-	this._root = options._root || this;
-	this._yield = options._yield;
-	this._bind = options._bind;
-
 	if (!options._root) {
 		this._oncreate = [];
 		this._beforecreate = [];
diff --git a/test/js/samples/onrender-onteardown-rewritten/expected-bundle.js b/test/js/samples/onrender-onteardown-rewritten/expected-bundle.js
index 272f822a9e..c1556145d3 100644
--- a/test/js/samples/onrender-onteardown-rewritten/expected-bundle.js
+++ b/test/js/samples/onrender-onteardown-rewritten/expected-bundle.js
@@ -13,6 +13,10 @@ function assign(target) {
 	return target;
 }
 
+function blankObject() {
+	return Object.create(null);
+}
+
 function destroy(detach) {
 	this.destroy = noop;
 	this.fire('destroy');
@@ -48,10 +52,6 @@ function dispatchObservers(component, group, changed, newState, oldState) {
 	}
 }
 
-function get(key) {
-	return key ? this._state[key] : this._state;
-}
-
 function fire(eventName, data) {
 	var handlers =
 		eventName in this._handlers && this._handlers[eventName].slice();
@@ -62,6 +62,20 @@ function fire(eventName, data) {
 	}
 }
 
+function get(key) {
+	return key ? this._state[key] : this._state;
+}
+
+function init(component, options) {
+	component.options = options;
+
+	component._observers = { pre: blankObject(), post: blankObject() };
+	component._handlers = blankObject();
+	component._root = options._root || component;
+	component._yield = options._yield;
+	component._bind = options._bind;
+}
+
 function observe(key, callback, options) {
 	var group = options && options.defer
 		? this._observers.post
@@ -151,6 +165,8 @@ var proto = {
 	_unmount: _unmount
 };
 
+/* generated by Svelte v1.39.3 */
+
 var template = (function() {
 	return {
 		// this test should be removed in v2
@@ -175,21 +191,11 @@ function create_main_fragment(state, component) {
 }
 
 function SvelteComponent(options) {
-	this.options = options;
+	init(this, options);
 	this._state = options.data || {};
 
-	this._observers = {
-		pre: Object.create(null),
-		post: Object.create(null)
-	};
-
-	this._handlers = Object.create(null);
 	this._handlers.destroy = [template.ondestroy];
 
-	this._root = options._root || this;
-	this._yield = options._yield;
-	this._bind = options._bind;
-
 	var oncreate = template.oncreate.bind(this);
 
 	if (!options._root) {
diff --git a/test/js/samples/onrender-onteardown-rewritten/expected.js b/test/js/samples/onrender-onteardown-rewritten/expected.js
index 32a116b3a1..00323faf1c 100644
--- a/test/js/samples/onrender-onteardown-rewritten/expected.js
+++ b/test/js/samples/onrender-onteardown-rewritten/expected.js
@@ -1,4 +1,6 @@
-import { assign, callAll, noop, proto } from "svelte/shared.js";
+/* generated by Svelte v1.39.3 */
+
+import { assign, callAll, init, noop, proto } from "svelte/shared.js";
 
 var template = (function() {
 	return {
@@ -24,21 +26,11 @@ function create_main_fragment(state, component) {
 }
 
 function SvelteComponent(options) {
-	this.options = options;
+	init(this, options);
 	this._state = options.data || {};
 
-	this._observers = {
-		pre: Object.create(null),
-		post: Object.create(null)
-	};
-
-	this._handlers = Object.create(null);
 	this._handlers.destroy = [template.ondestroy]
 
-	this._root = options._root || this;
-	this._yield = options._yield;
-	this._bind = options._bind;
-
 	var oncreate = template.oncreate.bind(this);
 
 	if (!options._root) {
diff --git a/test/js/samples/setup-method/expected-bundle.js b/test/js/samples/setup-method/expected-bundle.js
index 6967036e49..a5c4ff68f8 100644
--- a/test/js/samples/setup-method/expected-bundle.js
+++ b/test/js/samples/setup-method/expected-bundle.js
@@ -13,6 +13,10 @@ function assign(target) {
 	return target;
 }
 
+function blankObject() {
+	return Object.create(null);
+}
+
 function destroy(detach) {
 	this.destroy = noop;
 	this.fire('destroy');
@@ -48,10 +52,6 @@ function dispatchObservers(component, group, changed, newState, oldState) {
 	}
 }
 
-function get(key) {
-	return key ? this._state[key] : this._state;
-}
-
 function fire(eventName, data) {
 	var handlers =
 		eventName in this._handlers && this._handlers[eventName].slice();
@@ -62,6 +62,20 @@ function fire(eventName, data) {
 	}
 }
 
+function get(key) {
+	return key ? this._state[key] : this._state;
+}
+
+function init(component, options) {
+	component.options = options;
+
+	component._observers = { pre: blankObject(), post: blankObject() };
+	component._handlers = blankObject();
+	component._root = options._root || component;
+	component._yield = options._yield;
+	component._bind = options._bind;
+}
+
 function observe(key, callback, options) {
 	var group = options && options.defer
 		? this._observers.post
@@ -151,6 +165,8 @@ var proto = {
 	_unmount: _unmount
 };
 
+/* generated by Svelte v1.39.3 */
+
 var template = (function() {
 	return {
 		methods: {
@@ -186,20 +202,9 @@ function create_main_fragment(state, component) {
 }
 
 function SvelteComponent(options) {
-	this.options = options;
+	init(this, options);
 	this._state = options.data || {};
 
-	this._observers = {
-		pre: Object.create(null),
-		post: Object.create(null)
-	};
-
-	this._handlers = Object.create(null);
-
-	this._root = options._root || this;
-	this._yield = options._yield;
-	this._bind = options._bind;
-
 	this._fragment = create_main_fragment(this._state, this);
 
 	if (options.target) {
diff --git a/test/js/samples/setup-method/expected.js b/test/js/samples/setup-method/expected.js
index 50d2ec47c5..a544e229bc 100644
--- a/test/js/samples/setup-method/expected.js
+++ b/test/js/samples/setup-method/expected.js
@@ -1,4 +1,6 @@
-import { assign, noop, proto } from "svelte/shared.js";
+/* generated by Svelte v1.39.3 */
+
+import { assign, init, noop, proto } from "svelte/shared.js";
 
 var template = (function() {
 	return {
@@ -35,20 +37,9 @@ function create_main_fragment(state, component) {
 }
 
 function SvelteComponent(options) {
-	this.options = options;
+	init(this, options);
 	this._state = options.data || {};
 
-	this._observers = {
-		pre: Object.create(null),
-		post: Object.create(null)
-	};
-
-	this._handlers = Object.create(null);
-
-	this._root = options._root || this;
-	this._yield = options._yield;
-	this._bind = options._bind;
-
 	this._fragment = create_main_fragment(this._state, this);
 
 	if (options.target) {
diff --git a/test/js/samples/use-elements-as-anchors/expected-bundle.js b/test/js/samples/use-elements-as-anchors/expected-bundle.js
index dc41a1501f..ae00877549 100644
--- a/test/js/samples/use-elements-as-anchors/expected-bundle.js
+++ b/test/js/samples/use-elements-as-anchors/expected-bundle.js
@@ -37,6 +37,10 @@ function createComment() {
 	return document.createComment('');
 }
 
+function blankObject() {
+	return Object.create(null);
+}
+
 function destroy(detach) {
 	this.destroy = noop;
 	this.fire('destroy');
@@ -72,10 +76,6 @@ function dispatchObservers(component, group, changed, newState, oldState) {
 	}
 }
 
-function get(key) {
-	return key ? this._state[key] : this._state;
-}
-
 function fire(eventName, data) {
 	var handlers =
 		eventName in this._handlers && this._handlers[eventName].slice();
@@ -86,6 +86,20 @@ function fire(eventName, data) {
 	}
 }
 
+function get(key) {
+	return key ? this._state[key] : this._state;
+}
+
+function init(component, options) {
+	component.options = options;
+
+	component._observers = { pre: blankObject(), post: blankObject() };
+	component._handlers = blankObject();
+	component._root = options._root || component;
+	component._yield = options._yield;
+	component._bind = options._bind;
+}
+
 function observe(key, callback, options) {
 	var group = options && options.defer
 		? this._observers.post
@@ -175,6 +189,8 @@ var proto = {
 	_unmount: _unmount
 };
 
+/* generated by Svelte v1.39.3 */
+
 function create_main_fragment(state, component) {
 	var div, text, p, text_1, text_2, text_3, text_4, p_1, text_5, text_6, text_8, if_block_4_anchor;
 
@@ -312,6 +328,7 @@ function create_main_fragment(state, component) {
 	};
 }
 
+// (2:1) {{#if a}}
 function create_if_block(state, component) {
 	var p, text;
 
@@ -334,6 +351,7 @@ function create_if_block(state, component) {
 	};
 }
 
+// (8:1) {{#if b}}
 function create_if_block_1(state, component) {
 	var p, text;
 
@@ -356,6 +374,7 @@ function create_if_block_1(state, component) {
 	};
 }
 
+// (12:1) {{#if c}}
 function create_if_block_2(state, component) {
 	var p, text;
 
@@ -378,6 +397,7 @@ function create_if_block_2(state, component) {
 	};
 }
 
+// (18:1) {{#if d}}
 function create_if_block_3(state, component) {
 	var p, text;
 
@@ -400,6 +420,7 @@ function create_if_block_3(state, component) {
 	};
 }
 
+// (25:0) {{#if e}}
 function create_if_block_4(state, component) {
 	var p, text;
 
@@ -423,20 +444,9 @@ function create_if_block_4(state, component) {
 }
 
 function SvelteComponent(options) {
-	this.options = options;
+	init(this, options);
 	this._state = options.data || {};
 
-	this._observers = {
-		pre: Object.create(null),
-		post: Object.create(null)
-	};
-
-	this._handlers = Object.create(null);
-
-	this._root = options._root || this;
-	this._yield = options._yield;
-	this._bind = options._bind;
-
 	this._fragment = create_main_fragment(this._state, this);
 
 	if (options.target) {
diff --git a/test/js/samples/use-elements-as-anchors/expected.js b/test/js/samples/use-elements-as-anchors/expected.js
index d520ee49e6..6c18931e7a 100644
--- a/test/js/samples/use-elements-as-anchors/expected.js
+++ b/test/js/samples/use-elements-as-anchors/expected.js
@@ -1,4 +1,6 @@
-import { appendNode, assign, createComment, createElement, createText, detachNode, insertNode, noop, proto } from "svelte/shared.js";
+/* generated by Svelte v1.39.3 */
+
+import { appendNode, assign, createComment, createElement, createText, detachNode, init, insertNode, noop, proto } from "svelte/shared.js";
 
 function create_main_fragment(state, component) {
 	var div, text, p, text_1, text_2, text_3, text_4, p_1, text_5, text_6, text_8, if_block_4_anchor;
@@ -137,6 +139,7 @@ function create_main_fragment(state, component) {
 	};
 }
 
+// (2:1) {{#if a}}
 function create_if_block(state, component) {
 	var p, text;
 
@@ -159,6 +162,7 @@ function create_if_block(state, component) {
 	};
 }
 
+// (8:1) {{#if b}}
 function create_if_block_1(state, component) {
 	var p, text;
 
@@ -181,6 +185,7 @@ function create_if_block_1(state, component) {
 	};
 }
 
+// (12:1) {{#if c}}
 function create_if_block_2(state, component) {
 	var p, text;
 
@@ -203,6 +208,7 @@ function create_if_block_2(state, component) {
 	};
 }
 
+// (18:1) {{#if d}}
 function create_if_block_3(state, component) {
 	var p, text;
 
@@ -225,6 +231,7 @@ function create_if_block_3(state, component) {
 	};
 }
 
+// (25:0) {{#if e}}
 function create_if_block_4(state, component) {
 	var p, text;
 
@@ -248,20 +255,9 @@ function create_if_block_4(state, component) {
 }
 
 function SvelteComponent(options) {
-	this.options = options;
+	init(this, options);
 	this._state = options.data || {};
 
-	this._observers = {
-		pre: Object.create(null),
-		post: Object.create(null)
-	};
-
-	this._handlers = Object.create(null);
-
-	this._root = options._root || this;
-	this._yield = options._yield;
-	this._bind = options._bind;
-
 	this._fragment = create_main_fragment(this._state, this);
 
 	if (options.target) {