.eslintrc.js

module.exports = {
    parserOptions: {
        ecmaVersion: 12,
        sourceType: 'script',
        ecmaFeatures: {
            jsx: true,
            impliedStrict: true,
        },
    },
    globals: {
        _: 'readonly', // underscore.js
        $: 'readonly',
        fuzzy: 'readonly',
        jQuery: 'readonly',
        moment: 'readonly',
        odoo: 'readonly',
        web: 'readonly',
        openerp: 'readonly',
        Promise: 'readonly',
    },
    rules: {
        strict: [ 'error', 'safe' ],
        'no-cond-assign': [ 'error', 'always' ],
        indent: [ 'warn', 2 ],
        'array-bracket-spacing': [ 'warn', 'always' ],
        'no-const-assign': 'error',
        radix: 'error',
        // Force usage of ===
        eqeqeq: [ 'error', 'always' ],
        'no-debugger': 'error',
        'one-var': [ 'error', 'never' ],
        'prefer-template': 'error',
        'prefer-spread': 'error',

        // Enforce using const over let.
        'prefer-const': 'error',
        // var NO MORE please.
        'no-var': 'error',
        // Keep undefined undefined.
        'no-undefined': 'error',
        // Please keep variables defined javascript is already too hairy
        'init-declarations': [ 'error', 'always' ],
        'block-scoped-var': 'error',
        // French need unicode
        'require-unicode-regexp': 'error',

        'prefer-numeric-literals': 'error',
        'no-template-curly-in-string': 'error',

        'no-else-return': 0,
        // Eval keyword is forbidden.
        'no-eval': 'error',
        // prefer obj.prop instead of obj['prop'] unless possible.
        'no-extend-native': [ 'error', { exceptions: [ 'Object' ] } ],
        'no-implicit-coercion': 'error',

        'no-return-assign': 'error',
        'no-throw-literal': 'error',
        // Who know void existed in javascript !?
        'no-void': 'error',
        // No need to await without promises
        'require-await': 'error',
        'no-useless-computed-key': 'error',
        semi: [ 'error', 'always' ],
        'default-case': 'error',
        'no-use-before-define': [
            'error',
            { functions: false, classes: false, variables: true },
        ],

        // Documentation is important.
        // update to <https://github.com/gajus/eslint-plugin-jsdoc>
        'require-jsdoc': [ 'warn', {
            require: {
                FunctionDeclaration: true,
                MethodDefinition: true,
                ClassDeclaration: true,
                ArrowFunctionExpression: true,
                FunctionExpression: true,
            },
        } ],

        // Enforce having {} on if, while etc.
        curly: 'error',
    },
    env: {
        browser: true,
    },
    extends: [
        'eslint:recommended', 'airbnb',
    ],
};