fix instrumentation

src/compile/Component.ts

@@ -19,8 +19,9 @@ import addToSet from '../utils/addToSet';
 import isReference from 'is-reference';
 import TemplateScope from './nodes/shared/TemplateScope';
 import fuzzymatch from '../utils/fuzzymatch';
-import { remove_indentation } from '../utils/remove_indentation';
+import { remove_indentation, add_indentation } from '../utils/indentation';
 import getObject from '../utils/getObject';
+import deindent from '../utils/deindent';
 
 type Meta = {
 	namespace?: string;
@@ -614,34 +615,36 @@ export default class Component {
 
 		coalesced_declarations.forEach(group => {
 			const kind = group[0].kind;
-			let replacement = '';
+			let c = 0;
 
 			let combining = false;
 
 			group.forEach(node => {
-				node.declarations.forEach(({ id, init }) => {
+				node.declarations.forEach(declarator => {
+					const { id, init } = declarator;
+
 					if (id.type === 'Identifier') {
 						const value = init
 							? this.code.slice(id.start, init.end)
 							: this.code.slice(id.start, id.end);
 
 						if (combining) {
-							replacement += `, ${value}`;
+							code.overwrite(c, id.start, ', ');
 						} else {
-							replacement += `${kind} { ${value}`;
+							code.appendLeft(id.start, '{ ');
 							combining = true;
 						}
 					} else {
 						throw new Error('TODO destructured declarations');
 					}
+
+					c = declarator.end;
 				});
 			});
 
 			if (combining) {
-				replacement += ' } = $$props;';
+				code.prependRight(c, ' } = $$props');
 			}
-
-			this.code.overwrite(group[0].start, group[group.length - 1].end, replacement);
 		});
 	}
 
@@ -796,13 +799,18 @@ export default class Component {
 					}
 				});
 
+				add_indentation(this.code, node.body, 2);
+
 				unsorted_reactive_declarations.push({
 					assignees,
 					dependencies,
 					node,
 					snippet: node.body.type === 'BlockStatement'
 						? `[✂${node.body.start}-${node.end}✂]`
-						: `{ [✂${node.body.start}-${node.end}✂] }`
+						: deindent`
+							{
+								[✂${node.body.start}-${node.end}✂]
+							}`
 				});
 			}
 		});

src/compile/nodes/shared/Expression.ts

@@ -4,12 +4,12 @@ import isReference from 'is-reference';
 import flattenReference from '../../../utils/flattenReference';
 import { createScopes, Scope } from '../../../utils/annotateWithScopes';
 import { Node } from '../../../interfaces';
-import addToSet from '../../../utils/addToSet';
 import globalWhitelist from '../../../utils/globalWhitelist';
 import deindent from '../../../utils/deindent';
 import Wrapper from '../../render-dom/wrappers/shared/Wrapper';
 import sanitize from '../../../utils/sanitize';
 import TemplateScope from './TemplateScope';
+import getObject from '../../../utils/getObject';
 
 const binaryOperators: Record<string, number> = {
 	'**': 15,
@@ -248,7 +248,7 @@ export default class Expression {
 				if (function_expression) {
 					if (node.type === 'AssignmentExpression') {
 						// TODO handle destructuring assignments
-						const { name } = flattenReference(node.left);
+						const { name } = getObject(node.left);
 						pending_assignments.add(name);
 					}
 				} else {
@@ -296,7 +296,7 @@ export default class Expression {
 					let body = code.slice(node.body.start, node.body.end).trim();
 					if (node.body.type !== 'BlockStatement') {
 						if (pending_assignments.size > 0) {
-							const insert = [...pending_assignments].map(name => `$$make_dirty('${name}');`);
+							const insert = [...pending_assignments].map(name => `$$make_dirty('${name}')`).join('; ');
 							pending_assignments = new Set();
 
 							component.has_reactive_assignments = true;

src/compile/render-dom/index.ts

@@ -13,7 +13,7 @@ export default function dom(
 	component: Component,
 	options: CompileOptions
 ) {
-	const { name } = component;
+	const { name, code } = component;
 
 	const renderer = new Renderer(component, options);
 	const { block } = renderer;
@@ -153,27 +153,63 @@ export default function dom(
 		let scope = component.instance_scope;
 		let map = component.instance_scope_map;
 
+		let pending_assignments = new Set();
+
 		walk(component.instance_script.content, {
 			enter: (node, parent) => {
 				if (map.has(node)) {
 					scope = map.get(node);
 				}
+			},
+
+			leave(node) {
+				if (map.has(node)) {
+					scope = scope.parent;
+				}
 
 				if (node.type === 'AssignmentExpression') {
 					const { name } = getObject(node.left);
 
 					if (scope.findOwner(name) === component.instance_scope) {
-						component.instrument(node, parent, name, false);
+						pending_assignments.add(name);
+						component.has_reactive_assignments = true;
 					}
 				}
-			},
 
-			leave(node) {
-				if (map.has(node)) {
-					scope = scope.parent;
+				if (pending_assignments.size > 0) {
+					if (node.type === 'ArrowFunctionExpression') {
+						const insert = [...pending_assignments].map(name => `$$make_dirty('${name}')`).join(';');
+						pending_assignments = new Set();
+
+						code.prependRight(node.body.start, `{ const $$result = `);
+						code.appendLeft(node.body.end, `; ${insert}; return $$result; }`);
+
+						pending_assignments = new Set();
+					}
+
+					else if (/Statement/.test(node.type)) {
+						const insert = [...pending_assignments].map(name => `$$make_dirty('${name}')`).join('; ');
+
+						if (/^(Break|Continue|Return)Statement/.test(node.type)) {
+							if (node.argument) {
+								code.overwrite(node.start, node.argument.start, `var $$result = `);
+								code.appendLeft(node.argument.end, `; ${insert}; return $$result`);
+							} else {
+								code.prependRight(node.start, `${insert}; `);
+							}
+						} else {
+							code.appendLeft(node.end, `${code.original[node.end - 1] === ';' ? '' : ';'} ${insert};`);
+						}
+
+						pending_assignments = new Set();
+					}
 				}
 			}
 		});
+
+		if (pending_assignments.size > 0) {
+			throw new Error(`TODO this should not happen!`);
+		}
 	}
 
 	const args = ['$$self'];
@@ -237,8 +273,7 @@ export default function dom(
 				${component.reactive_declarations.length > 0 && deindent`
 				$$self.$$.update = ($$dirty = { ${Array.from(all_reactive_dependencies).map(n => `${n}: 1`).join(', ')} }) => {
 					${component.reactive_declarations.map(d => deindent`
-					if (${Array.from(d.dependencies).map(n => `$$dirty.${n}`).join(' || ')}) ${d.snippet}
-					`)}
+					if (${Array.from(d.dependencies).map(n => `$$dirty.${n}`).join(' || ')}) ${d.snippet}`)}
 				};
 				`}
 

src/utils/indentation.ts

@@ -1,6 +1,7 @@
 import MagicString from 'magic-string';
 import { Node } from '../interfaces';
 import { walk } from 'estree-walker';
+import repeat from './repeat';
 
 export function remove_indentation(code: MagicString, node: Node) {
 	const indent = code.getIndentString();
@@ -26,4 +27,31 @@ export function remove_indentation(code: MagicString, node: Node) {
 
 		code.remove(index, index + indent.length);
 	}
+}
+
+export function add_indentation(code: MagicString, node: Node, levels = 1) {
+	const base_indent = code.getIndentString();
+	const indent = repeat(base_indent, levels);
+	const pattern = /\n/gm;
+
+	const excluded = [];
+
+	walk(node, {
+		enter(node) {
+			if (node.type === 'TemplateElement') {
+				excluded.push(node);
+			}
+		}
+	});
+
+	const str = code.original.slice(node.start, node.end);
+
+	let match;
+	while (match = pattern.exec(str)) {
+		const index = node.start + match.index;
+		while (excluded[0] && excluded[0].end < index) excluded.shift();
+		if (excluded[0] && excluded[0].start < index) continue;
+
+		code.appendLeft(index + 1, indent);
+	}
 }

test/js/samples/dev-warning-missing-data-computed/expected.js

@@ -64,7 +64,9 @@ function define($$self, $$props, $$make_dirty) {
 	};
 
 	$$self.$$.update = ($$dirty = { foo: 1 }) => {
-		if ($$dirty.foo) { bar = foo * 2; $$make_dirty('bar'); }
+		if ($$dirty.foo) {
+			bar = foo * 2; $$make_dirty('bar');
+		}
 	};
 }
 

test/runtime/samples/assignment-in-init/_config.js

@@ -0,0 +1,6 @@
+export default {
+	test({ assert, component }) {
+		assert.equal(component.get_foo(), 1);
+		assert.equal(component.get_bar(), 2);
+	}
+};

test/runtime/samples/assignment-in-init/main.html

@@ -0,0 +1,7 @@
+<script>
+	let foo;
+	let bar = (foo = 1) * 2;
+
+	export const get_foo = () => foo;
+	export const get_bar = () => bar;
+</script>

test/runtime/samples/computed-function/_config.js

@@ -2,8 +2,10 @@ export default {
 	html: '<p>50</p>',
 
 	test({ assert, component, target }) {
+		console.group('range [50,100]');
 		component.range = [50, 100];
 		assert.htmlEqual(target.innerHTML, '<p>75</p>');
+		console.groupEnd();
 
 		component.range = [50, 60];
 		assert.htmlEqual(target.innerHTML, '<p>55</p>');