.eslintrc.json

{
  "env": {
    "node": true
  },
  "parser": "@typescript-eslint/parser",
  "parserOptions": {
    "ecmaVersion": 11
  },
  "extends": [
    "eslint:recommended",
    "plugin:@typescript-eslint/recommended"
  ],
  "plugins": [
    "@typescript-eslint"
  ],
  "rules": {
    /* Best Practices */
    "accessor-pairs": ["error", {
      "setWithoutGet": true
    }],
    "curly": ["error", "multi-line"],
    "dot-location": ["error", "property"],
    "grouped-accessor-pairs": ["error", "getBeforeSet"],
    "eqeqeq": ["error", "always"],
    "no-case-declarations": "error",
    "no-else-return": "error",
    "no-fallthrough": "off",
    "no-floating-decimal": "error",
    "no-multi-spaces": "error",
    "no-useless-escape": "error",

    /* Variables */
    "no-shadow": "off",
    "no-unused-vars": "off",
    "no-use-before-define": "off",

    /* Stylistic Issues */
    "block-spacing": "error",
    "brace-style": ["error", "stroustrup"],
    "comma-dangle": ["error", "always-multiline"],
    "comma-spacing": ["error", { 
      "before": false, 
      "after": true 
    }],
    "comma-style": ["error", "last"],
    "eol-last": ["error", "always"],
    "indent": ["error", 2, {
      "SwitchCase": 1
    }],
    "key-spacing": ["error", {
      "beforeColon": false
    }],
    "keyword-spacing": ["error", {
      "overrides": {
        "else": { "before": false, "after": true }
      }
    }],
    "linebreak-style": "off",
    "newline-per-chained-call": ["error", {
      "ignoreChainWithDepth": 2
    }],
    "no-multiple-empty-lines": ["error", {
      "max": 1,
      "maxEOF": 0 
    }],
    "no-trailing-spaces": ["error", {
      "ignoreComments": true
    }],
    "no-whitespace-before-property": "error",
    "object-curly-spacing": ["error", "always"],
    "object-property-newline": ["error", {
      "allowMultiplePropertiesPerLine": true
    }],
    "padding-line-between-statements": ["error", 
      {
        "blankLine": "always", 
        "prev": [
          "block-like", 
          "multiline-block-like", 
          "multiline-expression"
        ], 
        "next": "*"
      },
      {
        "blankLine": "always", 
        "prev": "*",
        "next": [
          "block-like", 
          "multiline-block-like", 
          "return"
        ]
      },
      {
        "blankLine": "any", 
        "prev": "case",
        "next": "case" 
      },
      {
        "blankLine": "always", 
        "prev": ["let", "var", "const"],
        "next": ["expression", "multiline-expression"]
      },
      {
        "blankLine": "always", 
        "prev": ["expression", "multiline-expression"],
        "next": ["let", "var", "const"]
      },
      {
        "blankLine": "always", 
        "prev": "*",
        "next": ["function", "class"]
      }
    ],
    "quotes": ["error", "single"],
    "semi": "off",
    "semi-spacing": ["error", {
      "before": false, 
      "after": true
    }],
    "space-before-blocks": "error",
    "space-before-function-paren": ["error", {
      "anonymous": "always",
      "named": "never",
      "asyncArrow": "always"
    }],
    "space-infix-ops": "error",
    "spaced-comment": "error",
    "switch-colon-spacing": "error",

    /* ECMAScript 6 */
    "arrow-parens": "error",
    "arrow-spacing": "error",
    "no-duplicate-imports": "error",
    "no-useless-constructor": "off",
    "no-var": "error",
    "object-shorthand": "error",
    "prefer-arrow-callback": "error" 
  },
  "overrides": [
    {
      "files": [
        "./**/*.ts",
        "./**/*.d.ts"
      ],
      "rules": {
        // This rule is disabled for reverse indexing in enums
        "@typescript-eslint/no-explicit-any": "off",
        "@typescript-eslint/no-var-requires": "error",

        "@typescript-eslint/semi": ["error", "always"],
        "@typescript-eslint/no-shadow": "off",
        "@typescript-eslint/no-unused-vars": "error",
        "@typescript-eslint/no-use-before-define": ["error", {
          "functions": false,
          "classes": false,
          "variables": true
        }],
        "@typescript-eslint/no-useless-constructor": "error",
        "@typescript-eslint/explicit-module-boundary-types": "error",
        
        "indent": "off",
        "@typescript-eslint/indent": ["error", 2, {
          "SwitchCase": 1
        }]
      }
    },
    {
      "files": [
        "./**/*.js",
        "./**/*.mjs"
      ],
      "rules": {
        "@typescript-eslint/no-var-requires": "off",
        "@typescript-eslint/semi": "off",
        "@typescript-eslint/no-shadow": "off",
        "@typescript-eslint/no-unused-vars": "off",
        "@typescript-eslint/no-use-before-define": "off",
        "@typescript-eslint/no-useless-constructor": "off",
        "@typescript-eslint/explicit-module-boundary-types": "off"
      }
    }
  ]
}