Fix spread function result side effects

package-lock.json

@@ -1,6 +1,6 @@
 {
   "name": "svelte",
-  "version": "3.6.7",
+  "version": "3.6.9",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {

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

@@ -195,11 +195,12 @@ export default class InlineComponentWrapper extends Wrapper {
 					if (attr.is_spread) {
 						const value = attr.expression.render(block);
 						initial_props.push(value);
-						let value_object_check = value
+
+						let value_object = value
 						if (attr.expression.node.type !== 'ObjectExpression') {
-							value_object_check = `typeof ${value} === 'object' && ${value} !== null ? ${value} : {}`;
+							value_object = `@get_spread_object(${value})`;
 						}
-						changes.push(condition ? `${condition} && (${value_object_check})` : value_object_check);
+						changes.push(condition ? `${condition} && ${value_object}` : value_object);
 					} else {
 						const obj = `{ ${quote_name_if_necessary(name)}: ${attr.get_value(block)} }`;
 						initial_props.push(obj);

src/runtime/internal/spread.ts

@@ -35,3 +35,7 @@ export function get_spread_update(levels, updates) {
 
 	return update;
 }
+
+export function get_spread_object(spread_props) {
+	return typeof spread_props === 'object' && spread_props !== null ? spread_props : {};
+}

test/runtime/samples/spread-component-dynamic-non-object-boolean/_config.js

@@ -1,24 +0,0 @@
-export default {
-	props: {
-		props: {
-			foo: 'lol',
-			baz: 40 + 2,
-		}
-	},
-
-	html: `
-		<div><p>foo: lol</p>
-		<p>baz: 42</p>
-		<p>qux: named</p>
-	`,
-
-	test({ assert, component, target }) {
-		component.props = true;
-
-		assert.htmlEqual(target.innerHTML, `
-			<div><p>foo: undefined</p>
-			<p>baz: undefined</p>
-			<p>qux: named</p>
-		`);
-	}
-};

test/runtime/samples/spread-component-dynamic-non-object-multiple-dependencies/Widget.svelte

@@ -1,6 +1,11 @@
 <script>
 	export let foo;
 	export let baz;
+	export let qux;
+	export let corge;
 </script>
 
-{foo} {baz}
+<p>foo: {foo}</p>
+<p>baz: {baz}</p>
+<p>qux: {qux}</p>
+<p>corge: {corge}</p>

test/runtime/samples/spread-component-dynamic-non-object-multiple-dependencies/_config.js

@@ -1,10 +1,53 @@
 export default {
-	html: `b baz`,
-	test({ assert, component, target }) {
-		component.bar = undefined;
-		assert.htmlEqual(
-			target.innerHTML,
-			`b undefined`
-		);
+	props: {
+		props: {
+			foo: 'lol',
+			baz: 40 + 2,
+		}
 	},
+
+	html: `
+		<div><p>foo: lol</p>
+		<p>baz: 42</p>
+		<p>qux: named</p>
+		<p>corge: b</p>
+	`,
+
+	test({ assert, component, target }) {
+		const html = `
+			<div><p>foo: undefined</p>
+			<p>baz: undefined</p>
+			<p>qux: named</p>
+			<p>corge: b</p>
+		`;
+
+		// test undefined
+		component.props = undefined;
+		assert.htmlEqual(target.innerHTML, html);
+
+		// set object props
+		component.props = this.props.props;
+		assert.htmlEqual(target.innerHTML, this.html);
+
+		// test null
+		component.props = null;
+		assert.htmlEqual(target.innerHTML, html);
+
+		// set object props
+		component.props = this.props.props;
+		assert.htmlEqual(target.innerHTML, this.html);
+
+		// test boolean
+		component.props = true;
+		assert.htmlEqual(target.innerHTML, html);
+
+		// set object props
+		component.props = this.props.props;
+		assert.htmlEqual(target.innerHTML, this.html);
+
+		// test number
+		component.props = 123;
+		assert.htmlEqual(target.innerHTML, html);
+
+	}
 };

test/runtime/samples/spread-component-dynamic-non-object-multiple-dependencies/main.svelte

@@ -1,10 +1,13 @@
 <script>
-	export let foo = false;
+	import Widget from './Widget.svelte';
+
+	export let props;
+
+	export let corge = false;
 	export let a = 'a';
 	export let b = 'b';
-	export let bar = { baz: 'baz' };
-
-	import Widget from './Widget.svelte';
 </script>
 
-<Widget foo={foo ? a : b} {...bar}/>
+<div>
+	<Widget corge={corge ? a : b} {...props} qux="named"/>
+</div>

test/runtime/samples/spread-component-dynamic-non-object-null/Widget.svelte

@@ -1,9 +0,0 @@
-<script>
-	export let foo;
-	export let baz;
-	export let qux;
-</script>
-
-<p>foo: {foo}</p>
-<p>baz: {baz}</p>
-<p>qux: {qux}</p>

test/runtime/samples/spread-component-dynamic-non-object-null/_config.js

@@ -1,24 +0,0 @@
-export default {
-	props: {
-		props: {
-			foo: 'lol',
-			baz: 40 + 2,
-		}
-	},
-
-	html: `
-		<div><p>foo: lol</p>
-		<p>baz: 42</p>
-		<p>qux: named</p>
-	`,
-
-	test({ assert, component, target }) {
-		component.props = null;
-
-		assert.htmlEqual(target.innerHTML, `
-			<div><p>foo: undefined</p>
-			<p>baz: undefined</p>
-			<p>qux: named</p>
-		`);
-	}
-};

test/runtime/samples/spread-component-dynamic-non-object-null/main.svelte

@@ -1,9 +0,0 @@
-<script>
-	import Widget from './Widget.svelte';
-
-	export let props;
-</script>
-
-<div>
-	<Widget {...props} qux="named"/>
-</div>

test/runtime/samples/spread-component-dynamic-non-object-number/_config.js

@@ -1,24 +0,0 @@
-export default {
-	props: {
-		props: {
-			foo: 'lol',
-			baz: 40 + 2,
-		}
-	},
-
-	html: `
-		<div><p>foo: lol</p>
-		<p>baz: 42</p>
-		<p>qux: named</p>
-	`,
-
-	test({ assert, component, target }) {
-		component.props = 1337;
-
-		assert.htmlEqual(target.innerHTML, `
-			<div><p>foo: undefined</p>
-			<p>baz: undefined</p>
-			<p>qux: named</p>
-		`);
-	}
-};

test/runtime/samples/spread-component-dynamic-non-object-number/main.svelte

@@ -1,9 +0,0 @@
-<script>
-	import Widget from './Widget.svelte';
-
-	export let props;
-</script>
-
-<div>
-	<Widget {...props} qux="named"/>
-</div>

test/runtime/samples/spread-component-dynamic-non-object-undefined/Widget.svelte

@@ -1,9 +0,0 @@
-<script>
-	export let foo;
-	export let baz;
-	export let qux;
-</script>
-
-<p>foo: {foo}</p>
-<p>baz: {baz}</p>
-<p>qux: {qux}</p>

test/runtime/samples/spread-component-dynamic-non-object-undefined/_config.js

@@ -1,24 +0,0 @@
-export default {
-	props: {
-		props: {
-			foo: 'lol',
-			baz: 40 + 2,
-		}
-	},
-
-	html: `
-		<div><p>foo: lol</p>
-		<p>baz: 42</p>
-		<p>qux: named</p>
-	`,
-
-	test({ assert, component, target }) {
-		component.props = undefined;
-
-		assert.htmlEqual(target.innerHTML, `
-			<div><p>foo: undefined</p>
-			<p>baz: undefined</p>
-			<p>qux: named</p>
-		`);
-	}
-};

test/runtime/samples/spread-component-dynamic-non-object-undefined/main.svelte

@@ -1,9 +0,0 @@
-<script>
-	import Widget from './Widget.svelte';
-
-	export let props;
-</script>
-
-<div>
-	<Widget {...props} qux="named"/>
-</div>

test/runtime/samples/spread-component-dynamic-non-object/_config.js

@@ -0,0 +1,51 @@
+export default {
+	props: {
+		props: {
+			foo: 'lol',
+			baz: 40 + 2,
+		}
+	},
+
+	html: `
+		<div><p>foo: lol</p>
+		<p>baz: 42</p>
+		<p>qux: named</p>
+	`,
+
+	test({ assert, component, target }) {
+		const html = `
+			<div><p>foo: undefined</p>
+			<p>baz: undefined</p>
+			<p>qux: named</p>
+		`;
+
+		// test undefined
+		component.props = undefined;
+		assert.htmlEqual(target.innerHTML, html);
+
+		// set object props
+		component.props = this.props.props;
+		assert.htmlEqual(target.innerHTML, this.html);
+
+		// test null
+		component.props = null;
+		assert.htmlEqual(target.innerHTML, html);
+
+		// set object props
+		component.props = this.props.props;
+		assert.htmlEqual(target.innerHTML, this.html);
+
+		// test boolean
+		component.props = true;
+		assert.htmlEqual(target.innerHTML, html);
+
+		// set object props
+		component.props = this.props.props;
+		assert.htmlEqual(target.innerHTML, this.html);
+
+		// test number
+		component.props = 123;
+		assert.htmlEqual(target.innerHTML, html);
+
+	}
+};

test/runtime/samples/spread-component-side-effects/Widget.svelte

@@ -1,9 +1,9 @@
 <script>
+	export let i;
 	export let foo;
-	export let baz;
 	export let qux;
 </script>
 
+<p>i: {i}</p>
 <p>foo: {foo}</p>
-<p>baz: {baz}</p>
 <p>qux: {qux}</p>

test/runtime/samples/spread-component-side-effects/_config.js

@@ -0,0 +1,19 @@
+export default {
+	props: {},
+
+	html: `
+		<div><p>i: 1</p>
+		<p>foo: foo</p>
+		<p>qux: named</p>
+	`,
+
+	test({ assert, component, target }) {
+		component.foo = 'lol';
+
+		assert.htmlEqual(target.innerHTML, `
+			<div><p>i: 2</p>
+			<p>foo: lol</p>
+			<p>qux: named</p>
+		`);
+	}
+};

test/runtime/samples/spread-component-side-effects/main.svelte

@@ -0,0 +1,16 @@
+<script>
+	import Widget from './Widget.svelte';
+
+	export let foo = 'foo';
+
+	let i = 0
+
+	const getProps = (foo) => {
+		i += 1;
+		return { foo,  i };
+	}
+</script>
+
+<div>
+	<Widget {...getProps(foo)} qux="named"/>
+</div>