test-assignment-overleaf/.eslint-config-preact-nojest.cjs

// Code taken from https://github.com/preactjs/eslint-config-preact/blob/v1.3.0/index.js
// and modified to remove all jest mentions, because jest plugin is incompatible with typescript-eslint plugin v6
// (see https://github.com/jest-community/eslint-plugin-jest/pull/1401 for more details)
// and to change it from JSM to CJS

module.exports = {
    // TODO: this is really only required for class property initializer methods, which are seeing declining usage.
    // At some point, we should un-ship the custom parser and let ESLint use esprima.
    parser: require.resolve('@babel/eslint-parser'),

    // Currently ignored due to the custom parser.
    parserOptions: {
        ecmaVersion: 2020,
        sourceType: 'module',
        ecmaFeatures: {
            modules: true,
            impliedStrict: true,
            jsx: true,
        },
        requireConfigFile: false,
        babelOptions: {
            plugins: [
                '@babel/plugin-syntax-class-properties',
                [
                    '@babel/plugin-syntax-decorators',
                    { decoratorsBeforeExport: false },
                ],
                '@babel/plugin-syntax-jsx',
            ],
        },
    },

    // We don't use plugin:react/recommended here to avoid React-specific rules.
    extends: ['eslint:recommended'],

    // TODO: preact-cli ships Jest now, Mocha may be a candidate for removal.
    plugins: ['compat', 'react', 'react-hooks'],

    env: {
        browser: true,
        es6: true,
        node: true,
    },

    globals: {
        expect: true,
        browser: true,
        global: true,
    },

    settings: {
        // Preact CLI provides these defaults
        targets: ['last 2 versions'],
        polyfills: ['fetch', 'Promise'],
        react: {
            // eslint-plugin-preact interprets this as "h.createElement",
            // however we only care about marking h() as being a used variable.
            pragma: 'h',
            // We use "react 16.0" to avoid pushing folks to UNSAFE_ methods.
            version: '16.0',
        },
    },

    rules: {
        /**
         * Preact / JSX rules
         */
        'react/no-deprecated': 2,
        'react/react-in-jsx-scope': 0, // handled this automatically
        'react/display-name': [1, { ignoreTranspilerName: false }],
        'react/jsx-no-bind': [
            1,
            {
                ignoreRefs: true,
                allowFunctions: true,
                allowArrowFunctions: true,
            },
        ],
        'react/jsx-no-comment-textnodes': 2,
        'react/jsx-no-duplicate-props': 2,
        'react/jsx-no-target-blank': 2,
        'react/jsx-no-undef': 2,
        'react/jsx-tag-spacing': [2, { beforeSelfClosing: 'always' }],
        'react/jsx-uses-react': 2, // debatable
        'react/jsx-uses-vars': 2,
        'react/jsx-key': [2, { checkFragmentShorthand: true }],
        'react/self-closing-comp': 2,
        'react/prefer-es6-class': 2,
        'react/prefer-stateless-function': 1,
        'react/require-render-return': 2,
        'react/no-danger': 1,
        // Legacy APIs not supported in Preact:
        'react/no-did-mount-set-state': 2,
        'react/no-did-update-set-state': 2,
        'react/no-find-dom-node': 2,
        'react/no-is-mounted': 2,
        'react/no-string-refs': 2,

        /**
         * Hooks
         */
        'react-hooks/rules-of-hooks': 2,
        'react-hooks/exhaustive-deps': 1,

        /**
         * General JavaScript error avoidance
         */
        'constructor-super': 2,
        'no-caller': 2,
        'no-const-assign': 2,
        'no-delete-var': 2,
        'no-dupe-class-members': 2,
        'no-dupe-keys': 2,
        'no-duplicate-imports': 2,
        'no-else-return': 1,
        'no-empty-pattern': 0,
        'no-empty': 0,
        'no-extra-parens': 0,
        'no-iterator': 2,
        'no-lonely-if': 2,
        'no-mixed-spaces-and-tabs': [1, 'smart-tabs'],
        'no-multi-str': 1,
        'no-new-wrappers': 2,
        'no-proto': 2,
        'no-redeclare': 2,
        'no-shadow-restricted-names': 2,
        'no-shadow': 0,
        'no-spaced-func': 2,
        'no-this-before-super': 2,
        'no-undef-init': 2,
        'no-unneeded-ternary': 2,
        'no-unused-vars': [
            2,
            {
                args: 'after-used',
                ignoreRestSiblings: true,
            },
        ],
        'no-useless-call': 1,
        'no-useless-computed-key': 1,
        'no-useless-concat': 1,
        'no-useless-constructor': 1,
        'no-useless-escape': 1,
        'no-useless-rename': 1,
        'no-var': 1,
        'no-with': 2,

        /**
         * General JavaScript stylistic rules (disabled)
         */
        semi: 0,
        strict: [2, 'never'], // assume type=module output (cli default)
        'object-curly-spacing': [0, 'always'],
        'rest-spread-spacing': 0,
        'space-before-function-paren': [0, 'always'],
        'space-in-parens': [0, 'never'],
        'object-shorthand': 1,
        'prefer-arrow-callback': 1,
        'prefer-rest-params': 1,
        'prefer-spread': 1,
        'prefer-template': 1,
        quotes: [
            0,
            'single',
            {
                avoidEscape: true,
                allowTemplateLiterals: true,
            },
        ],
        'quote-props': [2, 'as-needed'],
        radix: 1, // parseInt(x, 10)
        'unicode-bom': 2,
        'valid-jsdoc': 0,
    },
};