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feat: async Svelte#725

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Merged
ota-meshi merged 9 commits intomainfromfeat/async
Jul 16, 2025
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5 changes: 5 additions & 0 deletions.changeset/huge-islands-crash.md
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@@ -0,0 +1,5 @@
---
"svelte-eslint-parser":minor
---

feat: support asynchronous svelte
4 changes: 2 additions & 2 deletionsREADME.md
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Expand Up@@ -12,7 +12,7 @@

# svelte-eslint-parser

## [Svelte](https://svelte.dev/) parser for [ESLint](https://eslint.org/).
## [Svelte](https://svelte.dev/) parser for [ESLint](https://eslint.org/)

[Live DEMO](https://sveltejs.github.io/svelte-eslint-parser/playground) •
[Discord](https://svelte.dev/chat)
Expand DownExpand Up@@ -100,7 +100,7 @@ export default [
parser: svelteParser,
parserOptions: {
sourceType: "module",
ecmaVersion:2021,
ecmaVersion:2024,
ecmaFeatures: {
globalReturn: false,
impliedStrict: false,
Expand Down
2 changes: 1 addition & 1 deletionexplorer-v2/src/lib/ESLintPlayground.svelte
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Expand Up@@ -119,7 +119,7 @@
languageOptions: {
parser: svelteEslintParser,
parserOptions: {
ecmaVersion:2020,
ecmaVersion:2024,
sourceType: 'module',
parser: { ts: tsParser, typescript: tsParser }
},
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2 changes: 1 addition & 1 deletionpackage.json
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Expand Up@@ -105,7 +105,7 @@
"prettier-plugin-svelte": "^3.3.3",
"rimraf": "^6.0.1",
"semver": "^7.7.1",
"svelte": "^5.30.1",
"svelte": "^5.36.2",
"svelte2tsx": "^0.7.35",
"tsx": "^4.19.3",
"typescript": "~5.8.2",
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1 change: 1 addition & 0 deletionssrc/parser/compat.ts
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Expand Up@@ -4,6 +4,7 @@ import type * as SvAST from "./svelte-ast-types.js";
import type * as Compiler from "./svelte-ast-types-for-v5.js";

export type Child =
| Compiler.AttachTag
| Compiler.Text
| Compiler.Tag
| Compiler.ElementLike
Expand Down
2 changes: 1 addition & 1 deletionsrc/parser/parser-options.ts
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Expand Up@@ -41,7 +41,7 @@ export type NormalizedParserOptions = {
/** Normalize parserOptions */
exportfunctionnormalizeParserOptions(options:any):NormalizedParserOptions{
constparserOptions={
ecmaVersion:2020,
ecmaVersion:2024,
sourceType:"module",
loc:true,
range:true,
Expand Down
17 changes: 9 additions & 8 deletionssrc/parser/typescript/analyze/index.ts
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Expand Up@@ -399,7 +399,7 @@ function analyzeRuneVariables(
continue;
}
switch (globalName) {
// See https://github.com/sveltejs/svelte/blob/3c4a8d425b8192dc11ea2af256d531c51c37ba5d/packages/svelte/types/index.d.ts#L2679
// See https://github.com/sveltejs/svelte/blob/3fa3dd78a1cbaa88a1571977b76bf6f02ed4231d/packages/svelte/types/index.d.ts#L3093
case "$state": {
appendDeclareFunctionVirtualScripts(globalName, [
"<T>(initial: T): T",
Expand All@@ -415,7 +415,7 @@ function analyzeRuneVariables(

break;
}
// See https://github.com/sveltejs/svelte/blob/3c4a8d425b8192dc11ea2af256d531c51c37ba5d/packages/svelte/types/index.d.ts#L2833
// See https://github.com/sveltejs/svelte/blob/3fa3dd78a1cbaa88a1571977b76bf6f02ed4231d/packages/svelte/types/index.d.ts#L3247
case "$derived": {
appendDeclareFunctionVirtualScripts(globalName, [
"<T>(expression: T): T",
Expand All@@ -425,35 +425,36 @@ function analyzeRuneVariables(
]);
break;
}
// See https://github.com/sveltejs/svelte/blob/3c4a8d425b8192dc11ea2af256d531c51c37ba5d/packages/svelte/types/index.d.ts#L2893
// See https://github.com/sveltejs/svelte/blob/3fa3dd78a1cbaa88a1571977b76bf6f02ed4231d/packages/svelte/types/index.d.ts#L3307
case "$effect": {
appendDeclareFunctionVirtualScripts(globalName, [
"(fn: () => void | (() => void)): void",
]);
appendDeclareNamespaceVirtualScripts(globalName, [
"export function pre(fn: () => void | (() => void)): void;",
"export function pending(): number;",
"export function tracking(): boolean;",
"export function root(fn: () => void | (() => void)): () => void;",
]);
break;
}
// See https://github.com/sveltejs/svelte/blob/3c4a8d425b8192dc11ea2af256d531c51c37ba5d/packages/svelte/types/index.d.ts#L2997
// See https://github.com/sveltejs/svelte/blob/3fa3dd78a1cbaa88a1571977b76bf6f02ed4231d/packages/svelte/types/index.d.ts#L3416
case "$props": {
//Usetypeparameters to avoid`@typescript-eslint/no-unsafe-assignment` errors.
//NOTE: In the Svelte repository's `index.d.ts`, the returntypeis any, but that triggers`@typescript-eslint/no-unsafe-assignment`. To avoid this, use generics here.
appendDeclareFunctionVirtualScripts(globalName, ["<T>(): T"]);
appendDeclareNamespaceVirtualScripts(globalName, [
"export function id(): string;",
]);
break;
}
// See https://github.com/sveltejs/svelte/blob/3c4a8d425b8192dc11ea2af256d531c51c37ba5d/packages/svelte/types/index.d.ts#L3038
// See https://github.com/sveltejs/svelte/blob/3fa3dd78a1cbaa88a1571977b76bf6f02ed4231d/packages/svelte/types/index.d.ts#L3459
case "$bindable": {
appendDeclareFunctionVirtualScripts(globalName, [
"<T>(fallback?: T): T",
]);
break;
}
// See https://github.com/sveltejs/svelte/blob/3c4a8d425b8192dc11ea2af256d531c51c37ba5d/packages/svelte/types/index.d.ts#L3081
// See https://github.com/sveltejs/svelte/blob/3fa3dd78a1cbaa88a1571977b76bf6f02ed4231d/packages/svelte/types/index.d.ts#L3502
case "$inspect": {
appendDeclareFunctionVirtualScripts(globalName, [
`<T extends any[]>(...values: T): { with: (fn: (type: 'init' | 'update', ...values: T) => void) => void }`,
Expand All@@ -463,7 +464,7 @@ function analyzeRuneVariables(
]);
break;
}
// See https://github.com/sveltejs/svelte/blob/3c4a8d425b8192dc11ea2af256d531c51c37ba5d/packages/svelte/types/index.d.ts#L3144
// See https://github.com/sveltejs/svelte/blob/3fa3dd78a1cbaa88a1571977b76bf6f02ed4231d/packages/svelte/types/index.d.ts#L3565
case "$host": {
appendDeclareFunctionVirtualScripts(globalName, [
`<El extends HTMLElement = HTMLElement>(): El`,
Expand Down
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Expand Up@@ -940,7 +940,7 @@
}
},
{
"type": "Keyword",
"type": "Null",
"value": "null",
"range": [
46,
Expand DownExpand Up@@ -976,7 +976,7 @@
}
},
{
"type": "Keyword",
"type": "Null",
"value": "null",
"range": [
53,
Expand DownExpand Up@@ -1516,7 +1516,7 @@
}
},
{
"type": "Keyword",
"type": "Null",
"value": "null",
"range": [
136,
Expand Down
9 changes: 9 additions & 0 deletionstests/fixtures/parser/ast/svelte5/async/_config.json
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@@ -0,0 +1,9 @@
{
"svelteConfig": {
"compilerOptions": {
"experimental": {
"async":true
}
}
}
}
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@@ -0,0 +1,11 @@
<script>
import MyApp from './MyApp.svelte';
</script>

<svelte:boundary>
<MyApp />

{#snippet pending()}
<p>loading...</p>
{/snippet}
</svelte:boundary>
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