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chore: migrate to ESLint 9 with flat config #895

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Initial plan
Copilot Mar 11, 2026
33f14a0
chore: migrate to ESLint 9 with flat config and typescript-eslint v8
Copilot Mar 11, 2026
e178adc
chore: remove indent rule and restore original windowsConoutConnectio…
Copilot Mar 12, 2026
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139 changes: 0 additions & 139 deletions .eslintrc.js
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128 changes: 128 additions & 0 deletions eslint.config.js
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Original file line number Diff line number Diff line change
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// @ts-check
const tsParser = require('@typescript-eslint/parser');
const tsPlugin = require('@typescript-eslint/eslint-plugin');
const globals = require('globals');

/** @type {import('eslint').Linter.Config[]} */
module.exports = [
{
ignores: [
'**/typings/*.d.ts',
'scripts/**/*',
'examples/**/*',
],
},
{
files: ['src/**/*.ts'],
languageOptions: {
parser: tsParser,
parserOptions: {
project: 'src/tsconfig.json',
sourceType: 'module',
},
globals: {
...globals.browser,
...globals.es2015,
...globals.node,
},
},
plugins: {
'@typescript-eslint': tsPlugin,
},
rules: {
'@typescript-eslint/array-type': [
'error',
{
default: 'array-simple',
readonly: 'generic',
},
],
'@typescript-eslint/consistent-type-definitions': 'error',
'@typescript-eslint/explicit-function-return-type': [
'error',
{
'allowExpressions': true,
},
],
'@typescript-eslint/naming-convention': [
'error',
{ 'selector': 'default', 'format': ['camelCase'] },
// variableLike
{ 'selector': 'variable', 'format': ['camelCase', 'UPPER_CASE'] },
{ 'selector': 'variable', 'filter': '^I.+Service$', 'format': ['PascalCase'], 'prefix': ['I'] },
// memberLike
{ 'selector': 'memberLike', 'modifiers': ['private'], 'format': ['camelCase'], 'leadingUnderscore': 'require' },
{ 'selector': 'memberLike', 'modifiers': ['protected'], 'format': ['camelCase'], 'leadingUnderscore': 'require' },
{ 'selector': 'enumMember', 'format': ['UPPER_CASE'] },
// memberLike - Allow enum-like objects to use UPPER_CASE
{ 'selector': 'property', 'modifiers': ['public'], 'format': ['camelCase', 'UPPER_CASE'] },
{ 'selector': 'method', 'modifiers': ['public'], 'format': ['camelCase', 'UPPER_CASE'] },
// typeLike
{ 'selector': 'typeLike', 'format': ['PascalCase'] },
{ 'selector': 'interface', 'format': ['PascalCase'], 'prefix': ['I'] },
],
'@typescript-eslint/prefer-namespace-keyword': 'error',
'comma-dangle': [
'error',
{
'objects': 'never',
'arrays': 'never',
'functions': 'never',
},
],
'curly': [
'error',
'multi-line',
],
'eol-last': 'error',
'eqeqeq': [
'error',
'always',
],
'keyword-spacing': 'error',
'new-parens': 'error',
'no-duplicate-imports': 'error',
'no-else-return': [
'error',
{
allowElseIf: false,
},
],
'no-eval': 'error',
'no-irregular-whitespace': 'error',
'no-restricted-imports': [
'error',
{
'patterns': [
'.*\\/out\\/.*',
],
},
],
'no-trailing-spaces': 'error',
'no-unsafe-finally': 'error',
'no-var': 'error',
'one-var': [
'error',
'never',
],
'prefer-const': 'error',
'quotes': [
'error',
'single',
{ 'allowTemplateLiterals': true },
],
'semi': [
'error',
'always',
],
'spaced-comment': [
'error',
'always',
{
'markers': ['/'],
'exceptions': ['-'],
},
],
},
},
];
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