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feat: improve svelte/valid-prop-names-in-kit-pages and svelte/no-export-load-in-svelte-module-in-kit-pages to use svelte.config.js data
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‎.changeset/silent-lamps-chew.md

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---
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'eslint-plugin-svelte': minor
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---
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feat: improve `svelte/valid-prop-names-in-kit-pages` to use `svelte.config.js` data from the parser.

‎.changeset/silent-lamps-chew2.md

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---
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'eslint-plugin-svelte': minor
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---
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feat: improve `svelte/no-export-load-in-svelte-module-in-kit-pages` to use `svelte.config.js` data from the parser.

‎README.md

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@@ -229,6 +229,36 @@ for some context.
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:::
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#### Specify `svelte.config.js`
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If you are using `eslint.config.js`, we recommend that you import and specify `svelte.config.js`.
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By specifying it, some rules of `eslint-plugin-svelte` will read it and try to behave well for you by default.
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Some Svelte configurations will be statically loaded from `svelte.config.js` even if you don't specify it, but you need to specify it to make it work better.
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Example **eslint.config.js**:
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```js
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import eslintPluginSvelte from 'eslint-plugin-svelte';
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import svelteConfig from './svelte.config.js';
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export default [
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...eslintPluginSvelte.configs['flat/recommended'],
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{
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files: [
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'**/*.svelte',
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'*.svelte'
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// Add more files if you need.
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// '**/*.svelte.ts', '*.svelte.ts', '**/*.svelte.js', '*.svelte.js',
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],
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languageOptions: {
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parserOptions: {
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// Specify the `svelte.config.js`.
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svelteConfig
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}
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}
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}
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];
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```
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#### settings.svelte
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You can change the behavior of this plugin with some settings.
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#### settings.svelte.kit
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::: warning
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Even if you don't specify `settings.svelte.kit`, the rules will try to load information from `svelte.config.js`, so specify `settings.svelte.kit` if the default doesn't work.
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:::
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If you use SvelteKit with not default configuration, you need to set below configurations.
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The schema is subset of SvelteKit's configuration.
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Therefore please check [SvelteKit docs](https://kit.svelte.dev/docs/configuration) for more details.

‎docs/user-guide.md

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:::
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#### Specify `svelte.config.js`
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If you are using `eslint.config.js`, we recommend that you import and specify `svelte.config.js`.
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By specifying it, some rules of `eslint-plugin-svelte` will read it and try to behave well for you by default.
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Some Svelte configurations will be statically loaded from `svelte.config.js` even if you don't specify it, but you need to specify it to make it work better.
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Example **eslint.config.js**:
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```js
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import eslintPluginSvelte from 'eslint-plugin-svelte';
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import svelteConfig from './svelte.config.js';
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export default [
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...eslintPluginSvelte.configs['flat/recommended'],
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{
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files: [
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'**/*.svelte',
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'*.svelte'
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// Add more files if you need.
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// '**/*.svelte.ts', '*.svelte.ts', '**/*.svelte.js', '*.svelte.js',
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],
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languageOptions: {
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parserOptions: {
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// Specify the `svelte.config.js`.
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svelteConfig
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}
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}
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}
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];
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```
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#### settings.svelte
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You can change the behavior of this plugin with some settings.
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#### settings.svelte.kit
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::: warning
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Even if you don't specify `settings.svelte.kit`, the rules will try to load information from `svelte.config.js`, so specify `settings.svelte.kit` if the default doesn't work.
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:::
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If you use SvelteKit with not default configuration, you need to set below configurations.
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The schema is subset of SvelteKit's configuration.
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Therefore please check [SvelteKit docs](https://kit.svelte.dev/docs/configuration) for more details.

‎packages/eslint-plugin-svelte/src/rules/no-unused-class-name.ts

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}
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},
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'Program:exit'() {
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const styleContext = sourceCode.parserServices.getStyleContext();
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if (['parse-error', 'unknown-lang'].includes(styleContext.status)) {
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const styleContext = sourceCode.parserServices.getStyleContext!();
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if (styleContext.status === 'parse-error' || styleContext.status === 'unknown-lang') {
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return;
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}
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const classesUsedInStyle =
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styleContext.sourceAst != null ? findClassesInPostCSSNode(styleContext.sourceAst) : [];
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styleContext.status === 'success' ? findClassesInPostCSSNode(styleContext.sourceAst) : [];
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for (const className in classesUsedInTemplate) {
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if (!allowedClassNames.includes(className) && !classesUsedInStyle.includes(className)) {
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context.report({

‎packages/eslint-plugin-svelte/src/types.ts

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import type { JSONSchema4 } from 'json-schema';
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import type { Linter, Rule, SourceCode as ESLintSourceCode } from 'eslint';
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import type { AST } from 'svelte-eslint-parser';
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import type { AST, StyleContext, SvelteConfig } from 'svelte-eslint-parser';
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import type { TSESTree } from '@typescript-eslint/types';
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import type { ScopeManager, Scope, Variable } from '@typescript-eslint/scope-manager';
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import type { ASTNode, ASTNodeWithParent, ASTNodeListener } from './types-for-node';
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import type * as TS from 'typescript';
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export type { ASTNode, ASTNodeWithParent, ASTNodeListener };
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export interface RuleListener extends ASTNodeListener {
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ast: AST.SvelteProgram;
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lines: string[];
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hasBOM: boolean;
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parserServices: ESLintSourceCode.ParserServices;
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parserServices: {
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isSvelte?: boolean;
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isSvelteScript?: boolean;
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getSvelteHtmlAst?: () => unknown;
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getStyleContext?: () => StyleContext;
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svelteParseContext?: {
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/**
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* Whether to use Runes mode.
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* May be `true` if the user is using Svelte v5.
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* Resolved from `svelte.config.js` or `parserOptions`, but may be overridden by `<svelte:options>`.
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*/
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runes?: boolean;
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/** The version of "svelte/compiler". */
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compilerVersion?: string;
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/** The result of static analysis of `svelte.config.js`. */
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svelteConfig?: SvelteConfig | null;
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};
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program?: TS.Program;
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esTreeNodeToTSNodeMap?: ReadonlyMap<unknown, TS.Node>;
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tsNodeToESTreeNodeMap?: ReadonlyMap<TS.Node, ASTNode>;
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hasFullTypeInformation?: boolean; // Old typescript-eslint
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[key: string]: unknown;
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};
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scopeManager: ScopeManager;
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visitorKeys: ESLintSourceCode.VisitorKeys;
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‎packages/eslint-plugin-svelte/src/utils/svelte-kit.ts

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import fs from 'fs';
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import path from 'path';
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import { getPackageJson } from './get-package-json';
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import { getFilename } from './compat';
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import { getFilename, getSourceCode } from './compat';
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const isRunOnBrowser = !fs.readFileSync;
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// Hack: if it runs on browser, it regards as SvelteKit project.
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if (isRunOnBrowser) return true;
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if (!hasSvelteKit(getFilename(context))) return false;
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const routes = context.settings?.svelte?.kit?.files?.routes?.replace(/^\//, '') ?? 'src/routes';
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const routes =
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(
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context.settings?.svelte?.kit?.files?.routes ??
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getSourceCode(context).parserServices.svelteParseContext?.svelteConfig?.kit?.files?.routes
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)?.replace(/^\//, '') ?? 'src/routes';
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const filePath = getFilename(context);
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const projectRootDir = getProjectRootDir(getFilename(context)) ?? '';
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const fileName = path.basename(filePath);

‎packages/eslint-plugin-svelte/tests/fixtures/rules/no-export-load-in-svelte-module-in-kit-pages/invalid/svelte-config-from-parser-options/+test01-errors.yaml

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- message: disallow exporting load functions in `*.svelte` module in SvelteKit
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page components.
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line: 2
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column: 18
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suggestions: null

‎packages/eslint-plugin-svelte/tests/fixtures/rules/no-export-load-in-svelte-module-in-kit-pages/invalid/svelte-config-from-parser-options/+test01-input.svelte

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<script context="module">
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export function load() {}
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</script>

‎packages/eslint-plugin-svelte/tests/fixtures/rules/no-export-load-in-svelte-module-in-kit-pages/invalid/svelte-config-from-parser-options/_config.json

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{
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"languageOptions": {
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"parserOptions": {
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"svelteConfig": {
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"kit": {
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"files": {
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"routes": "tests/fixtures/rules/no-export-load-in-svelte-module-in-kit-pages/invalid/svelte-config-from-parser-options"
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}
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}
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}
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}
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}
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}

‎packages/eslint-plugin-svelte/tests/fixtures/rules/no-export-load-in-svelte-module-in-kit-pages/invalid/svelte-config/+test01-errors.yaml

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- message: disallow exporting load functions in `*.svelte` module in SvelteKit
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page components.
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line: 2
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column: 18
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suggestions: null

‎packages/eslint-plugin-svelte/tests/fixtures/rules/no-export-load-in-svelte-module-in-kit-pages/invalid/svelte-config/+test01-input.svelte

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<script context="module">
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export function load() {}
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</script>

‎packages/eslint-plugin-svelte/tests/fixtures/rules/no-export-load-in-svelte-module-in-kit-pages/invalid/svelte-config/svelte.config.js

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export default {
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kit: {
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files: {
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routes:
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'tests/fixtures/rules/no-export-load-in-svelte-module-in-kit-pages/invalid/svelte-config'
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}
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}
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};

‎packages/eslint-plugin-svelte/tests/fixtures/rules/valid-prop-names-in-kit-pages/invalid/svelte-config-from-parser-options/+test001-errors.yaml

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- message: disallow props other than data or errors in SvelteKit page components.
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line: 2
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column: 13
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suggestions: null
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- message: disallow props other than data or errors in SvelteKit page components.
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line: 3
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column: 13
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suggestions: null
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- message: disallow props other than data or errors in SvelteKit page components.
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line: 4
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column: 15
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suggestions: null
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- message: disallow props other than data or errors in SvelteKit page components.
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line: 4
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column: 20
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suggestions: null
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- message: disallow props other than data or errors in SvelteKit page components.
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line: 5
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column: 21
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suggestions: null
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- message: disallow props other than data or errors in SvelteKit page components.
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line: 5
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column: 36
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suggestions: null

‎packages/eslint-plugin-svelte/tests/fixtures/rules/valid-prop-names-in-kit-pages/invalid/svelte-config-from-parser-options/+test001-input.svelte

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<script>
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export let foo;
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export let bar;
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export let { baz, qux } = data;
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export let { data: data2, errors: errors2 } = { data: {}, errors: {} };
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</script>
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{foo}, {bar}

‎packages/eslint-plugin-svelte/tests/fixtures/rules/valid-prop-names-in-kit-pages/invalid/svelte-config-from-parser-options/_config.json

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{
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"languageOptions": {
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"parserOptions": {
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"svelteConfig": {
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"kit": {
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"files": {
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"routes": "tests/fixtures/rules/valid-prop-names-in-kit-pages/invalid/svelte-config-from-parser-options"
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}
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}
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}
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}
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}
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}

‎packages/eslint-plugin-svelte/tests/fixtures/rules/valid-prop-names-in-kit-pages/invalid/svelte-config/+test001-errors.yaml

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- message: disallow props other than data or errors in SvelteKit page components.
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line: 2
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column: 13
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suggestions: null
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- message: disallow props other than data or errors in SvelteKit page components.
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line: 3
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column: 13
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suggestions: null
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- message: disallow props other than data or errors in SvelteKit page components.
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line: 4
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column: 15
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suggestions: null
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- message: disallow props other than data or errors in SvelteKit page components.
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line: 4
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column: 20
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suggestions: null
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- message: disallow props other than data or errors in SvelteKit page components.
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line: 5
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column: 21
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suggestions: null
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- message: disallow props other than data or errors in SvelteKit page components.
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line: 5
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column: 36
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suggestions: null

‎packages/eslint-plugin-svelte/tests/fixtures/rules/valid-prop-names-in-kit-pages/invalid/svelte-config/+test001-input.svelte

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<script>
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export let foo;
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export let bar;
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export let { baz, qux } = data;
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export let { data: data2, errors: errors2 } = { data: {}, errors: {} };
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</script>
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{foo}, {bar}

‎packages/eslint-plugin-svelte/tests/fixtures/rules/valid-prop-names-in-kit-pages/invalid/svelte-config/svelte.config.js

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export default {
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kit: {
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files: {
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routes: 'tests/fixtures/rules/valid-prop-names-in-kit-pages/invalid/svelte-config'
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}
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}
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};

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