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95 lines
No EOL
4.2 KiB
JavaScript
95 lines
No EOL
4.2 KiB
JavaScript
import js from '@eslint/js'
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import globals from 'globals'
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import tseslint from 'typescript-eslint'
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/**
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* ESLint configuration for the runtime SDK.
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*
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* The SDK is written in JavaScript with JSDoc types rather than TypeScript,
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* because it is served as source to be read as well as to be executed. That
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* choice drives the rule set:
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*
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* - The rules designed for a `.ts` boundary (`explicit-module-boundary-types`)
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* are redundant here: a JSDoc `@returns` annotation is the same information,
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* and the linter cannot see it as an annotation.
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* - The rules that catch real defects — floating promises, misused promises,
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* unreachable switch cases, unused variables — stay, and are errors.
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* - `no-console` is an error rather than a warning, because this module runs in
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* someone else's page and must not write to their console on a path they did
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* not ask for. The two exceptions below are deliberate diagnostics that only
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* fire when the theme itself has already failed.
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*
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* The SDK is loaded by third-party pages, so anything it gets wrong is somebody
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* else's incident. The strictness here is proportionate to that.
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*/
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export default tseslint.config(
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{ ignores: ['dist', 'node_modules', '*.config.js'] },
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js.configs.recommended,
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...tseslint.configs.recommendedTypeChecked,
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...tseslint.configs.stylisticTypeChecked,
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{
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languageOptions: {
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parserOptions: { projectService: true, tsconfigRootDir: import.meta.dirname },
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globals: { ...globals.browser, ...globals.es2022 },
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},
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plugins: { '@typescript-eslint': tseslint.plugin },
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rules: {
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// JSDoc already declares every boundary type in a JavaScript project.
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'@typescript-eslint/explicit-module-boundary-types': 'off',
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// A fetch stub that returns a Response directly has nothing to await.
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'@typescript-eslint/require-await': 'off',
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// `||` is deliberate where an empty string should fall through, which is
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// not what `??` does.
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'@typescript-eslint/prefer-nullish-coalescing': 'off',
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// --- correctness -----------------------------------------------------
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'@typescript-eslint/no-floating-promises': 'error',
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'@typescript-eslint/no-misused-promises': 'error',
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'@typescript-eslint/await-thenable': 'error',
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'@typescript-eslint/switch-exhaustiveness-check': 'error',
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// Disabled in this package. The DOM type definitions describe a fully
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// featured modern browser, but the runtime guards below exist for Safari
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// below 14 (no `MediaQueryList.addEventListener`) and for embedded
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// webviews with no `matchMedia` at all. Those guards are load-bearing for
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// the consumers this package exists to serve, and the rule reports them as
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// dead code.
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'@typescript-eslint/no-unnecessary-condition': 'off',
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'@typescript-eslint/no-unnecessary-type-assertion': 'error',
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'@typescript-eslint/consistent-type-imports': [
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'error',
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{ prefer: 'type-imports', fixStyle: 'inline-type-imports' },
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],
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'@typescript-eslint/no-unused-vars': [
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'error',
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{ argsIgnorePattern: '^_', varsIgnorePattern: '^_', caughtErrors: 'none' },
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],
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// --- host safety -----------------------------------------------------
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'no-console': ['error', { allow: ['warn', 'error'] }],
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eqeqeq: ['error', 'always', { null: 'ignore' }],
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'prefer-const': 'error',
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'no-var': 'error',
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'object-shorthand': 'error',
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// An unsubscribe function that does nothing is the correct return value
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// when there is nothing to unsubscribe from.
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'@typescript-eslint/no-empty-function': [
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'error',
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{ allow: ['arrowFunctions'] },
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],
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},
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},
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{
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// Tests build doubles that are deliberately loosely typed, and a test's
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// console output is how a failure is diagnosed.
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files: ['**/*.test.js'],
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rules: {
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'@typescript-eslint/no-explicit-any': 'off',
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'@typescript-eslint/no-unsafe-assignment': 'off',
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'@typescript-eslint/no-unsafe-member-access': 'off',
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'@typescript-eslint/no-unsafe-call': 'off',
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'@typescript-eslint/no-unsafe-return': 'off',
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'@typescript-eslint/unbound-method': 'off',
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'no-console': 'off',
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},
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},
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) |