.eslintrc

{
  "env": {
    "browser": true,
    "es6": true,
    "es2021": true
  },
  "extends": "eslint:recommended",
  "parser": "@babel/eslint-parser",
  "parserOptions": {
    "ecmaVersion": 2020,
    "sourceType": "module"
  },

  "rules": {
    "strict": [ 2, "global" ],

    "for-direction": 2,
    "getter-return": 2,
    "no-compare-neg-zero": 2,
    "no-cond-assign": [ 2, "except-parens" ],
    "no-console": 1,
    "no-constant-condition": 2,
    "no-control-regex": 2,
    "no-debugger": 2,
    "no-dupe-args": 2,
    "no-dupe-keys": 2,
    "no-duplicate-case": 2,
    "no-empty-character-class": 2,
    "no-empty": 2,
    "no-ex-assign": 2,
    "no-extra-boolean-cast": 2,
    "no-extra-parens": [ 1, "all" ],
    "no-extra-semi": 2,
    "no-func-assign": 2,
    "no-inner-declarations": [ 2, "functions" ],
    "no-invalid-regexp": 2,
    "no-irregular-whitespace": 2,
    "no-obj-calls": 2,
    "no-prototype-builtins": 2,
    "no-regex-spaces": 2,
    "no-sparse-arrays": 2,
    "no-unexpected-multiline": 2,
    "no-unreachable": 2,
    "no-unsafe-finally": 1,
    "no-unsafe-negation": 2,
    "use-isnan": 2,
    "valid-jsdoc": 2,
    "valid-typeof": 2,

    "no-delete-var": 2,
    "no-label-var": 2,
    "no-shadow": 2,
    "no-shadow-restricted-names": 2,
    "no-undef": [ 2, { "typeof": true } ],
    "no-undef-init": 2,
    "no-undefined": 2,
    "no-unused-vars": 2,
    "no-use-before-define": 2,

    "arrow-body-style": [ 2, "always" ],
    "arrow-parens": [ 2, "always" ],
    "arrow-spacing": [ 2, { "before": true, "after": true } ],
    "constructor-super": 2,
    "generator-star-spacing": [ 2,{"before":true,"after":true} ],
    "no-class-assign": 2,
    "no-confusing-arrow": [ 2, {"allowParens": false} ],
    "no-const-assign": 2,
    "no-dupe-class-members": 2,
    "no-duplicate-imports": [ 2, { "includeExports": true } ],
    "no-new-symbol": 2,
    "no-this-before-super": 2,
    "no-useless-computed-key": 2,
    "no-useless-constructor": 2,
    "no-useless-rename": 2,
    "no-var": 1,
    "object-shorthand": [ 2, "consistent-as-needed" ],
    "prefer-arrow-callback": [ 2, { "allowNamedFunctions": true, "allowUnboundThis": true } ],
    "prefer-const": [ 1, { "destructuring": "any", "ignoreReadBeforeAssign": false } ],
    "prefer-numeric-literals": 2,
    "prefer-rest-params": 1,
    "prefer-spread": 1,
    "prefer-template": 0,
    "require-yield": 2,
    "rest-spread-spacing": [ 2, "never" ],
    "symbol-description": 1,
    "template-curly-spacing": [ 2, "never" ],
    "yield-star-spacing": [ "error", { "before": true, "after": true } ],

    "array-bracket-newline": [ 2, "consistent" ],
    "array-bracket-spacing": [ 2, "always"],
    "block-spacing" : 2,
    "brace-style": [ 2, "1tbs", { "allowSingleLine": true } ],
    "comma-dangle": [ 2, { "arrays": "only-multiline", "objects": "only-multiline", "imports": "never", "exports": "never", "functions": "ignore" } ],
    "comma-spacing": [2, { "before": false, "after": true } ],
    "computed-property-spacing": [ 2, "always" ],
    "consistent-this": [ 1, "_self" ],
    "eol-last": [ 2, "always" ],
    "func-call-spacing": [ 2, "never" ],
    "indent": [ 2, 4 ],
    "key-spacing": [ 2, { "beforeColon": true, "afterColon": true, "mode": "strict" } ],
    "keyword-spacing": [ 2, { "before": true, "after": true } ],
    "linebreak-style": [ 2, "unix" ],
    "lines-around-comment": [ 2, { "beforeBlockComment": true, "beforeLineComment": true } ],
    "lines-between-class-members": [ 2, "always" ],
    "max-len": [ 1, { "code": 140, "ignoreComments": true, "ignoreTrailingComments": true, "ignoreUrls": true, "ignoreStrings": false, "ignoreTemplateLiterals": true, "ignoreRegExpLiterals": true } ],
    "new-cap": [ 2, { "newIsCap": true, "capIsNew": false } ],
    "new-parens": 2,
    "no-lonely-if": 2,
    "no-mixed-spaces-and-tabs": 2,
    "no-multiple-empty-lines": [ 1, { "max": 1, "maxEOF": 1 } ],
    "no-trailing-spaces": 2,
    "no-unneeded-ternary": 2,

    "object-curly-spacing": [ 2, "always", { "arraysInObjects": true, "objectsInObjects": true } ],
    "one-var": [ 2, { "var": "always", "let": "consecutive", "const": "never" } ],

    "quotes": [ 2, "single", { "avoidEscape": true } ],
    "require-jsdoc": [ 1, { "require": { "FunctionDeclaration": true, "MethodDefinition": true, "ClassDeclaration": true, "ArrowFunctionExpression": true, "FunctionExpression": true } } ],
    "semi": 2,
    "semi-spacing": 2,
    "semi-style": [ 2, "last" ],
    "space-before-blocks": [ 2, "always" ],
    "space-before-function-paren": [ 2, "never" ],
    "space-in-parens": [ 2, "always" ],
    "space-infix-ops": [ 2, { "int32Hint": false } ],
    "space-unary-ops": [ 2, { "words": true, "nonwords": false } ],
    "spaced-comment": [ 2, "always" ],
    "switch-colon-spacing": [ 2, { "after": true, "before": true } ],
    "template-tag-spacing": [ 2, "always" ]
  }
}