[fix] Fix rvalue error when using arrow functions in {@const}

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

@@ -254,11 +254,17 @@ export default class Expression {
 					const declaration = b`const ${id} = ${node}`;
 
 					if (owner.type === 'ConstTag') {
+						let child_scope = scope;
 						walk(node, {
-							enter(node: Node) {
-								if (node.type === 'Identifier') {
+							enter(node: Node, parent: any) {
+								if (map.has(node)) child_scope = map.get(node);
+								if (node.type === 'Identifier' && is_reference(node, parent)) {
+									if (child_scope.has(node.name)) return;
 									this.replace(block.renderer.reference(node, ctx));
 								}
+							},
+							leave(node: Node) {
+								if (map.has(node)) child_scope = child_scope.parent;
 							}
 						});
 					} else if (dependencies.size === 0 && contextual_dependencies.size === 0) {

test/runtime/samples/const-tag-each-const/_config.js

@@ -0,0 +1,29 @@
+export default {
+	html: `
+			<p>0</p>
+			<p>bar: 1,2,3,1,1,2,3,2, num: 1</p>
+			<p>bar: 0,2,4,1,0,2,4,2, num: 2</p>
+	`,
+	async test({ component, target, assert }) {
+		assert.htmlEqual(
+			target.innerHTML,
+			`
+				<p>0</p>
+				<p>bar: 1,2,3,1,1,2,3,2, num: 1</p>
+				<p>bar: 0,2,4,1,0,2,4,2, num: 2</p>
+			`
+		);
+
+		component.nums = [1, 2, 3];
+
+		assert.htmlEqual(
+			target.innerHTML,
+			`
+				<p>0</p>
+				<p>bar: 1,2,3,1,1,2,3,2,1,2,3,3, num: 1</p>
+				<p>bar: 0,2,4,1,0,2,4,2,0,2,4,3, num: 2</p>
+				<p>bar: -100,0,100,1,-100,0,100,2,-100,0,100,3, num: 3</p>
+		`
+		);
+	}
+};

test/runtime/samples/const-tag-each-const/main.svelte

@@ -0,0 +1,26 @@
+<script>
+	export let nums = [1, 2];
+	let foos = [
+		{
+			nums: [1, 2, 3],
+		},
+		{
+			nums: [0, 2, 4],
+		},
+		{
+			nums: [-100, 0, 100],
+		},
+	];
+	let foo = 0;
+</script>
+
+<p>{foo}</p>
+{#each nums as num, index}
+	{@const bar = nums.map((num) => {
+		const func = (foos, num) => {
+			return [...foos.map((foo) => foo), num];
+		}
+		return func(foos[index].nums, num);
+	})}
+	<p>bar: {bar}, num: {num}</p>
+{/each}

test/runtime/samples/const-tag-each-duplicated-variable1/_config.js

@@ -0,0 +1,29 @@
+export default {
+	html: `
+		<p>bar: 1,2,3,0,2,4,-100,0,100, num: 1</p>
+		<p>bar: 1,2,3,0,2,4,-100,0,100, num: 2</p>
+		<p>bar: 1,2,3,0,2,4,-100,0,100, num: 3</p>
+	`,
+	async test({ component, target, assert }) {
+		assert.htmlEqual(
+			target.innerHTML,
+			`
+			  <p>bar: 1,2,3,0,2,4,-100,0,100, num: 1</p>
+				<p>bar: 1,2,3,0,2,4,-100,0,100, num: 2</p>
+				<p>bar: 1,2,3,0,2,4,-100,0,100, num: 3</p>
+			`
+		);
+
+		component.nums = [1, 2, 3, 4];
+
+		assert.htmlEqual(
+			target.innerHTML,
+			`
+				<p>bar: 1,2,3,0,2,4,-100,0,100, num: 1</p>
+				<p>bar: 1,2,3,0,2,4,-100,0,100, num: 2</p>
+				<p>bar: 1,2,3,0,2,4,-100,0,100, num: 3</p>
+				<p>bar: 1,2,3,0,2,4,-100,0,100, num: 4</p>
+		`
+		);
+	}
+};

test/runtime/samples/const-tag-each-duplicated-variable1/main.svelte

@@ -0,0 +1,19 @@
+<script>
+	export let nums = [1, 2, 3];
+	let foos = [
+		{
+			nums: [1, 2, 3],
+		},
+		{
+			nums: [0, 2, 4],
+		},
+		{
+			nums: [-100, 0, 100],
+		},
+	];
+</script>
+
+{#each nums as num}
+	{@const bar = foos.map((foos) => foos.nums)}
+	<p>bar: {bar}, num: {num}</p>
+{/each}

test/runtime/samples/const-tag-each-duplicated-variable2/_config.js

@@ -0,0 +1,32 @@
+export default {
+	html: `
+	    <p>foo: dummy-foo, num: dummy-num</p>
+		  <p>bar: 1,2,3,2,, num: 1</p>
+			<p>bar: 1,2,3,2,, num: 2</p>
+			<p>bar: 1,2,3,2,, num: 3</p>
+	`,
+	async test({ component, target, assert }) {
+		assert.htmlEqual(
+			target.innerHTML,
+			`
+			  <p>foo: dummy-foo, num: dummy-num</p>
+			  <p>bar: 1,2,3,2,, num: 1</p>
+				<p>bar: 1,2,3,2,, num: 2</p>
+				<p>bar: 1,2,3,2,, num: 3</p>
+			`
+		);
+
+		component.nums = [1, 2, 3, 4];
+
+		assert.htmlEqual(
+			target.innerHTML,
+			`
+			  <p>foo: dummy-foo, num: dummy-num</p>
+				<p>bar: 1,2,3,2,4,, num: 1</p>
+				<p>bar: 1,2,3,2,4,, num: 2</p>
+				<p>bar: 1,2,3,2,4,, num: 3</p>
+				<p>bar: 1,2,3,2,4,, num: 4</p>
+		`
+		);
+	}
+};

test/runtime/samples/const-tag-each-duplicated-variable2/main.svelte

@@ -0,0 +1,33 @@
+<script>
+	export let nums = [1, 2, 3];
+	let foos = [
+		{
+			nums: [1, 2, 3],
+		},
+		{
+			nums: [0, 2, 4],
+		},
+		{
+			nums: [-100, 0, 100],
+		},
+	];
+	let default_nums = [-1];
+	let foo = "dummy-foo";
+	let num = "dummy-num";
+</script>
+
+<p>foo: {foo}, num: {num}</p>
+{#each nums as num}
+	{@const bar = foos.map((foo) =>
+		foo.nums.filter((num) => {
+      if (Object.keys($$slots).length) {
+        return false;
+			} else if (Object.keys(foo).length) {
+				return nums.includes(num) || default_nums.includes(num);
+			} else {
+				return false;
+			}
+		}) || num
+	)}
+	<p>bar: {bar}, num: {num}</p>
+{/each}

test/runtime/samples/const-tag-each-duplicated-variable3/_config.js

@@ -0,0 +1,29 @@
+export default {
+	html: `
+			<p>0</p>
+			<p>bar: 1,2,3,1,1,2,3,2, num: 1</p>
+			<p>bar: 0,2,4,1,0,2,4,2, num: 2</p>
+	`,
+	async test({ component, target, assert }) {
+		assert.htmlEqual(
+			target.innerHTML,
+			`
+				<p>0</p>
+				<p>bar: 1,2,3,1,1,2,3,2, num: 1</p>
+				<p>bar: 0,2,4,1,0,2,4,2, num: 2</p>
+			`
+		);
+
+		component.nums = [1, 2, 3];
+
+		assert.htmlEqual(
+			target.innerHTML,
+			`
+				<p>0</p>
+				<p>bar: 1,2,3,1,1,2,3,2,1,2,3,3, num: 1</p>
+				<p>bar: 0,2,4,1,0,2,4,2,0,2,4,3, num: 2</p>
+				<p>bar: -100,0,100,1,-100,0,100,2,-100,0,100,3, num: 3</p>
+		`
+		);
+	}
+};

test/runtime/samples/const-tag-each-duplicated-variable3/main.svelte

@@ -0,0 +1,25 @@
+<script>
+	export let nums = [1, 2];
+	let foos = [
+		{
+			nums: [1, 2, 3],
+		},
+		{
+			nums: [0, 2, 4],
+		},
+		{
+			nums: [-100, 0, 100],
+		},
+	];
+	let foo = 0;
+</script>
+
+<p>{foo}</p>
+{#each nums as num, index}
+	{@const bar = nums.map((num) => {
+		return (function (foos, num) {
+			return [...foos.map((foo) => foo), num];
+		})(foos[index].nums, num);
+	})}
+	<p>bar: {bar}, num: {num}</p>
+{/each}

test/runtime/samples/const-tag-each-function/_config.js

@@ -0,0 +1,29 @@
+export default {
+	html: `
+			<p>0</p>
+			<p>bar: 1,2,3,1,1,2,3,2, num: 1</p>
+			<p>bar: 0,2,4,1,0,2,4,2, num: 2</p>
+	`,
+	async test({ component, target, assert }) {
+		assert.htmlEqual(
+			target.innerHTML,
+			`
+				<p>0</p>
+				<p>bar: 1,2,3,1,1,2,3,2, num: 1</p>
+				<p>bar: 0,2,4,1,0,2,4,2, num: 2</p>
+			`
+		);
+
+		component.nums = [1, 2, 3];
+
+		assert.htmlEqual(
+			target.innerHTML,
+			`
+				<p>0</p>
+				<p>bar: 1,2,3,1,1,2,3,2,1,2,3,3, num: 1</p>
+				<p>bar: 0,2,4,1,0,2,4,2,0,2,4,3, num: 2</p>
+				<p>bar: -100,0,100,1,-100,0,100,2,-100,0,100,3, num: 3</p>
+		`
+		);
+	}
+};

test/runtime/samples/const-tag-each-function/main.svelte

@@ -0,0 +1,26 @@
+<script>
+	export let nums = [1, 2];
+	let foos = [
+		{
+			nums: [1, 2, 3],
+		},
+		{
+			nums: [0, 2, 4],
+		},
+		{
+			nums: [-100, 0, 100],
+		},
+	];
+	let foo = 0;
+</script>
+
+<p>{foo}</p>
+{#each nums as num, index}
+	{@const bar = nums.map((num) => {
+		function func(foos, num) {
+			return [...foos.map((foo) => foo), num];
+		}
+		return func(foos[index].nums, num);
+	})}
+	<p>bar: {bar}, num: {num}</p>
+{/each}

test/runtime/samples/const-tag-shadow-2/_config.js

@@ -0,0 +1,37 @@
+export default {
+	html: `
+		<p>1</p>
+		<p>3,6,9</p>
+		<p>2</p>
+		<p>3,6,9</p>
+		<p>3</p>
+		<p>3,6,9</p>
+	`,
+	test({ component, target, assert }) {
+		component.baz = 5;
+		assert.htmlEqual(
+			target.innerHTML,
+			`
+			<p>1</p>
+			<p>5,10,15</p>
+			<p>2</p>
+			<p>5,10,15</p>
+			<p>3</p>
+			<p>5,10,15</p>
+		`
+		);
+
+		component.array = [3, 4, 5];
+		assert.htmlEqual(
+			target.innerHTML,
+			`
+			<p>3</p>
+			<p>15,20,25</p>
+			<p>4</p>
+			<p>15,20,25</p>
+			<p>5</p>
+			<p>15,20,25</p>
+		`
+		);
+	}
+};

test/runtime/samples/const-tag-shadow-2/main.svelte

@@ -0,0 +1,15 @@
+<script>
+	export let array = [1, 2, 3];
+	export let baz = 3;
+	const foo = (item) => item;
+</script>
+
+{#each array as item}
+	<p>{foo(item)}</p>
+	{@const bar = array.map((item) => {
+		const bar = baz;
+		const foo = (item) => item * bar;
+		return foo(item);
+	})}
+	<p>{bar}</p>
+{/each}