.eslintrc.json

{
    "root": true,
    "extends": [
        "eslint:recommended"
    ],
    "env": {
        "browser": true,
        "es2020": true
    },
    "rules": {
        "arrow-parens": ["error", "as-needed"],
        "arrow-spacing": ["error", { "before": true, "after": true }],
        "block-scoped-var": "error",
        "brace-style": ["error", "1tbs", { "allowSingleLine": false }],
        "comma-dangle": ["error", "always-multiline"],
        "comma-style": ["error", "last"],
        "eol-last": ["error", "always"],
        "eqeqeq": "error",
        "func-call-spacing": ["error", "never"],
        "guard-for-in": "error",
        "key-spacing": ["error", { "beforeColon": false, "afterColon": true, "mode": "strict" }],
        "keyword-spacing": ["error", { "before": true, "after": true }],
        "linebreak-style": ["error", "unix"],
        "max-len": ["error", { "code": 100, "tabWidth": 4 }],
        "no-alert": "error",
        "no-confusing-arrow": "error",
        "no-const-assign": "error",
        "no-debugger": "error",
        "no-div-regex": "error",
        "no-div-regex": "error",
        "no-dupe-args": "error",
        "no-dupe-else-if": "error",
        "no-dupe-keys": "error",
        "no-duplicate-case": "error",
        "no-ex-assign": "error",
        "no-fallthrough": "error",
        "no-floating-decimal": "error",
        "no-implicit-globals": "error",
        "no-implied-eval": "error",
        "no-import-assign": "error",
        "no-invalid-regexp": "error",
        "no-label-var": "error",
        "no-lonely-if": "error",
        "no-mixed-operators": "error",
        "no-multi-assign": "error",
        "no-return-assign": "error",
        "no-script-url": "error",
        "no-self-compare": "error",
        "no-sequences": "error",
        "no-template-curly-in-string": "error",
        "no-trailing-spaces": "error",
        "no-unused-vars": ["error", { "argsIgnorePattern": "^_", "varsIgnorePattern": "^_" }],
        "no-var": ["error"],
        "prefer-arrow-callback": ["error"],
        "prefer-const": ["error"],
        "quotes": ["error", "double"],
        "semi": ["error", "always"],
        "space-before-blocks": "error",
        "space-before-function-paren": ["error", "never"],
        "space-infix-ops": "error"
    },
    "overrides": [
        {
            "files": ["gui-tests/*"],
            "env": {
                "browser": false,
                "node": true
            }
        }
    ]
}