.eslintrc.json

{
  "env": {
    "node": true,
     "es2020": true,
     "browser": true
  },
  "parserOptions": {
    "ecmaVersion": 2020,
    "sourceType": "module",
    "ecmaFeatures": {
      "jsx": true
    }
  },
  "extends": "eslint:recommended",
  "rules": {
    // Force all variable names to use either camelCase style or UPPER_CASE
    // with underscores.
    "camelcase": ["error"],

    // Prohibit use of == and != in favor of === and !==.
    "eqeqeq": 2,

    // Enforce tab width of 2 spaces.
    "indent": ["warn", 2],

    // Prohibit use of a variable before it is defined.
    "no-use-before-define": 2,

    // Enforce line length to 100 characters
    "max-len": ["error", { "code": 300 }],

    // Require capitalized names for constructor functions.
    "new-cap": 1,

    // Enforce use of single quotation marks for strings.
    "quotes": ["error", "single"],

    // Enforce placing 'use strict' at the top function scope
    "strict": 0,

    // Prohibit use of explicitly undeclared variables.
    "no-undef": 2,

    // Warn when variables are defined but never used.
    "no-unused-vars": 1,

    // Suppress warnings about == null comparisons.
    "no-eq-null": 0,

    // Warn when there are dangling commas
    "comma-dangle": ["warn", "never"],

    "no-irregular-whitespace": ["warn"],

    "no-self-assign": ["warn"],

    "no-redeclare": ["warn"]
  }
}