getOverride.js

module.exports = (extraRules = null) => ({
    parser: '@typescript-eslint/parser',
    parserOptions: {
        ecmaVersion: 2019,
        sourceType: 'module',
        // typescript-eslint specific options
        warnOnUnsupportedTypeScriptVersion: true,
    },
    plugins: ['@typescript-eslint'],
    files: ['**/*.ts', '**/*.tsx'],
    rules: {
        '@typescript-eslint/no-inferrable-types': 'off',

        // TypeScript's `noFallthroughCasesInSwitch` option is more robust (#6906)
        'default-case': 'off',
        // 'tsc' already handles this (https://github.com/typescript-eslint/typescript-eslint/issues/291)
        'no-dupe-class-members': 'off',
        // 'tsc' already handles this (https://github.com/typescript-eslint/typescript-eslint/issues/477)
        'no-undef': 'off',
        // 'tsc' already handle this (https://github.com/typescript-eslint/typescript-eslint/releases/tag/v4.0.0)
        'no-shadow': 'off',

        // Add TypeScript specific rules (and turn off ESLint equivalents)
        '@typescript-eslint/consistent-type-assertions': 'warn',
        'no-array-constructor': 'off',
        '@typescript-eslint/no-array-constructor': 'warn',
        'no-use-before-define': 'off',
        '@typescript-eslint/no-use-before-define': [
            'warn',
            {
                functions: false,
                classes: false,
                variables: false,
                typedefs: false,
            },
        ],
        'no-unused-expressions': 'off',
        '@typescript-eslint/no-unused-expressions': [
            'error',
            {
                allowShortCircuit: true,
                allowTernary: true,
                allowTaggedTemplates: true,
            },
        ],
        'no-unused-vars': 'off',
        '@typescript-eslint/no-unused-vars': [
            'warn',
            {
                args: 'none',
                ignoreRestSiblings: true,
            },
        ],
        'no-useless-constructor': 'off',
        '@typescript-eslint/no-useless-constructor': 'warn',

        ...extraRules,
    },
});