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Fix: consider component and its snippets during css pruning (#15630)
* fix: consider component and its snippets during css pruning * add changeset * fix: avoid iterator.map --------- Co-authored-by: 7nik <kifiranet@gmail.com>
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12 files changed

+108
-39
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‎.changeset/nervous-humans-flash.md

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---
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'svelte': patch
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---
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fix: better consider component and its snippets during css pruning

‎packages/svelte/src/compiler/phases/2-analyze/css/css-prune.js

Lines changed: 19 additions & 7 deletions
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@@ -251,7 +251,11 @@ function apply_combinator(relative_selector, rest_selectors, rule, node, directi
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let sibling_matched = false;
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253253
for (const possible_sibling of siblings.keys()) {
254-
if (possible_sibling.type === 'RenderTag' || possible_sibling.type === 'SlotElement') {
254+
if (
255+
possible_sibling.type === 'RenderTag' ||
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possible_sibling.type === 'SlotElement' ||
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possible_sibling.type === 'Component'
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) {
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// `{@render foo()}<p>foo</p>` with `:global(.x) + p` is a match
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if (rest_selectors.length === 1 && rest_selectors[0].metadata.is_global) {
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sibling_matched = true;
@@ -814,10 +818,10 @@ function get_element_parent(node) {
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* @param {Direction} direction
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* @param {boolean} adjacent_only
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* @param {Set<Compiler.AST.SnippetBlock>} seen
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* @returns {Map<Compiler.AST.RegularElement | Compiler.AST.SvelteElement | Compiler.AST.SlotElement | Compiler.AST.RenderTag, NodeExistsValue>}
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* @returns {Map<Compiler.AST.RegularElement | Compiler.AST.SvelteElement | Compiler.AST.SlotElement | Compiler.AST.RenderTag | Compiler.AST.Component, NodeExistsValue>}
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*/
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function get_possible_element_siblings(node, direction, adjacent_only, seen = new Set()) {
820-
/** @type {Map<Compiler.AST.RegularElement | Compiler.AST.SvelteElement | Compiler.AST.SlotElement | Compiler.AST.RenderTag, NodeExistsValue>} */
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/** @type {Map<Compiler.AST.RegularElement | Compiler.AST.SvelteElement | Compiler.AST.SlotElement | Compiler.AST.RenderTag | Compiler.AST.Component, NodeExistsValue>} */
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const result = new Map();
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const path = node.metadata.path;
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@@ -847,14 +851,18 @@ function get_possible_element_siblings(node, direction, adjacent_only, seen = ne
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}
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// Special case: slots, render tags and svelte:element tags could resolve to no siblings,
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// so we want to continue until we find a definite sibling even with the adjacent-only combinator
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} else if (is_block(node)) {
851-
if (node.type === 'SlotElement') {
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} else if (is_block(node) || node.type === 'Component') {
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if (node.type === 'SlotElement' || node.type === 'Component') {
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result.set(node, NODE_PROBABLY_EXISTS);
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}
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const possible_last_child = get_possible_nested_siblings(node, direction, adjacent_only);
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add_to_map(possible_last_child, result);
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if (adjacent_only && has_definite_elements(possible_last_child)) {
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if (
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adjacent_only &&
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node.type !== 'Component' &&
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has_definite_elements(possible_last_child)
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) {
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return result;
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}
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} else if (node.type === 'SvelteElement') {
@@ -907,7 +915,7 @@ function get_possible_element_siblings(node, direction, adjacent_only, seen = ne
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}
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/**
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* @param {Compiler.AST.EachBlock | Compiler.AST.IfBlock | Compiler.AST.AwaitBlock | Compiler.AST.KeyBlock | Compiler.AST.SlotElement | Compiler.AST.SnippetBlock} node
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* @param {Compiler.AST.EachBlock | Compiler.AST.IfBlock | Compiler.AST.AwaitBlock | Compiler.AST.KeyBlock | Compiler.AST.SlotElement | Compiler.AST.SnippetBlock | Compiler.AST.Component} node
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* @param {Direction} direction
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* @param {boolean} adjacent_only
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* @param {Set<Compiler.AST.SnippetBlock>} seen
@@ -942,6 +950,10 @@ function get_possible_nested_siblings(node, direction, adjacent_only, seen = new
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seen.add(node);
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fragments.push(node.body);
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break;
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case 'Component':
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fragments.push(node.fragment, ...[...node.metadata.snippets].map((s) => s.body));
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break;
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}
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/** @type {Map<Compiler.AST.RegularElement | Compiler.AST.SvelteElement, NodeExistsValue>} NodeMap */

‎packages/svelte/tests/css/samples/general-siblings-combinator-slot/_config.js

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@@ -5,32 +5,20 @@ export default test({
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{
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code: 'css_unused_selector',
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message: 'Unused CSS selector ".b ~ .c"',
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start: { character: 137, column: 1, line: 11 },
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end: { character: 144, column: 8, line: 11 }
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start: { character: 191, column: 1, line: 13 },
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end: { character: 198, column: 8, line: 13 }
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},
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{
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code: 'css_unused_selector',
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message: 'Unused CSS selector ".c ~ .f"',
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start: { character: 162, column: 1, line: 12 },
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end: { character: 169, column: 8, line: 12 }
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},
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{
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code: 'css_unused_selector',
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message: 'Unused CSS selector ".f ~ .g"',
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start: { character: 187, column: 1, line: 13 },
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end: { character: 194, column: 8, line: 13 }
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start: { character: 216, column: 1, line: 14 },
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end: { character: 223, column: 8, line: 14 }
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},
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{
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code: 'css_unused_selector',
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message: 'Unused CSS selector ".b ~ .f"',
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start: { character: 212, column: 1, line: 14 },
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end: { character: 219, column: 8, line: 14 }
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},
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{
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code: 'css_unused_selector',
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message: 'Unused CSS selector ".b ~ .g"',
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start: { character: 237, column: 1, line: 15 },
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end: { character: 244, column: 8, line: 15 }
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start: { character: 241, column: 1, line: 15 },
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end: { character: 248, column: 8, line: 15 }
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}
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]
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});

‎packages/svelte/tests/css/samples/general-siblings-combinator-slot/expected.css

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@@ -2,10 +2,10 @@
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.d.svelte-xyz ~ .e:where(.svelte-xyz) { color: green; }
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.a.svelte-xyz ~ .g:where(.svelte-xyz) { color: green; }
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.a.svelte-xyz ~ .b:where(.svelte-xyz) { color: green; }
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.f.svelte-xyz ~ .g:where(.svelte-xyz) { color: green; }
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.b.svelte-xyz ~ .g:where(.svelte-xyz) { color: green; }
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/* no match */
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/* (unused) .b ~ .c { color: red; }*/
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/* (unused) .c ~ .f { color: red; }*/
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/* (unused) .f ~ .g { color: red; }*/
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/* (unused) .b ~ .f { color: red; }*/
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/* (unused) .b ~ .g { color: red; }*/

‎packages/svelte/tests/css/samples/general-siblings-combinator-slot/input.svelte

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@@ -6,13 +6,13 @@
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.d ~ .e { color: green; }
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.a ~ .g { color: green; }
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.a ~ .b { color: green; }
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.f ~ .g { color: green; }
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.b ~ .g { color: green; }
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/* no match */
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.b ~ .c { color: red; }
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.c ~ .f { color: red; }
13-
.f ~ .g { color: red; }
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.b ~ .f { color: red; }
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.b ~ .g { color: red; }
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</style>
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<div class="a"></div>

‎packages/svelte/tests/css/samples/siblings-combinator-component/Child.svelte

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<script>
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let { foo } = $props();
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</script>
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{@render foo()}

‎packages/svelte/tests/css/samples/siblings-combinator-component/_config.js

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import { test } from '../../test';
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export default test({
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warnings: [
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{
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code: 'css_unused_selector',
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message: 'Unused CSS selector "n + m"',
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end: {
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character: 468,
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column: 6,
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line: 36
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},
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start: {
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character: 463,
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column: 1,
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line: 36
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}
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}
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]
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});

‎packages/svelte/tests/css/samples/siblings-combinator-component/expected.css

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@@ -0,0 +1,8 @@
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x.svelte-xyz + y:where(.svelte-xyz) { color: green; }
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x.svelte-xyz + v:where(.svelte-xyz) { color: green; }
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x.svelte-xyz + z:where(.svelte-xyz) { color: green; }
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y.svelte-xyz + z:where(.svelte-xyz) { color: green; }
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v.svelte-xyz + z:where(.svelte-xyz) { color: green; }
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.component + z.svelte-xyz { color: green; }
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/* (unused) n + m { color: red; }*/

‎packages/svelte/tests/css/samples/siblings-combinator-component/input.svelte

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<script>
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import Child from './Child.svelte';
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</script>
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<div>
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<x></x>
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<Child>
8+
<y></y>
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{#snippet foo()}
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<v></v>
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{/snippet}
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</Child>
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<z></z>
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<Child>
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<span>
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<n></n>
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</span>
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{#snippet foo()}
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<span>
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<n></n>
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</span>
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{/snippet}
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</Child>
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<m></m>
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</div>
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<style>
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x + y { color: green; }
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x + v { color: green; }
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x + z { color: green; }
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y + z { color: green; }
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v + z { color: green; }
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:global(.component) + z { color: green; }
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n + m { color: red; }
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</style>

‎packages/svelte/tests/css/samples/siblings-combinator-slot/_config.js

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Original file line numberDiff line numberDiff line change
@@ -5,14 +5,8 @@ export default test({
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{
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code: 'css_unused_selector',
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message: 'Unused CSS selector ".b + .c"',
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start: { character: 110, column: 1, line: 10 },
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end: { character: 117, column: 8, line: 10 }
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},
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{
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code: 'css_unused_selector',
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message: 'Unused CSS selector ".c + .f"',
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start: { character: 135, column: 1, line: 11 },
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end: { character: 142, column: 8, line: 11 }
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start: { character: 137, column: 1, line: 11 },
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end: { character: 144, column: 8, line: 11 }
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}
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]
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});

‎packages/svelte/tests/css/samples/siblings-combinator-slot/expected.css

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@@ -1,7 +1,7 @@
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.d.svelte-xyz + .e:where(.svelte-xyz) { color: green; }
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.a.svelte-xyz + .b:where(.svelte-xyz) { color: green; }
4+
.c.svelte-xyz + .f:where(.svelte-xyz) { color: green; }
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56
/* no match */
67
/* (unused) .b + .c { color: red; }*/
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/* (unused) .c + .f { color: red; }*/

‎packages/svelte/tests/css/samples/siblings-combinator-slot/input.svelte

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<style>
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.d + .e { color: green; }
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.a + .b { color: green; }
8+
.c + .f { color: green; }
89
910
/* no match */
1011
.b + .c { color: red; }
11-
.c + .f { color: red; }
1212
</style>
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1414
<div class="a"></div>

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