.eslintrc.json

{
    "plugins": [
        "import",
        "react"
    ],
    "parserOptions": {
        "ecmaVersion": 11,
        "sourceType": "module",
        "ecmaFeatures": {
            "jsx": true
        }
    },
    "env": {
        "browser": true,
        "es6": true
    },
    "extends": [
        "eslint:recommended",
        "plugin:import/recommended",
        "plugin:react/recommended",
        "plugin:react/jsx-runtime"
    ],
    "rules": {
        // disabled until all our react usage is in TS files
        "react/prop-types": "off",
        "one-var-declaration-per-line": ["error", "always"],
        "one-var": ["error", "never"],
        "array-callback-return": "error",
        "guard-for-in": "error",
        "no-array-constructor": "error",
        "no-console": 0,
        "no-implied-eval": "error",
        "no-return-await": "error",
        "no-sequences": "error",
        "no-var": "error",
        // these comment markers fail CI (notes to self in code that need to be
        // resolved before a PR can be merged)
        "no-warning-comments": [
            "error",
            {
                "terms": ["XXX", "NOMERGE"],
                "location": "anywhere"
            }
        ],
        "prefer-arrow-callback": "error",
        "prefer-const": "error",
        "prefer-numeric-literals": "error",
        "prefer-rest-params": "error",
        "prefer-template": "error",
        "require-await": "error",
        "arrow-body-style": [
            "error",
            "as-needed"
        ],
        "curly": [
            "error",
            "all"
        ],
        "eqeqeq": [
            "error",
            "always",
            {
                "null": "ignore"
            }
        ],
        "func-style": [
            "error",
            "declaration",
            {
                "allowArrowFunctions": true
            }
        ],
        "no-use-before-define": [
            "error",
            "nofunc"
        ],
        "object-shorthand": [
            "error",
            "always"
        ],
        "operator-assignment": [
            "error",
            "always"
        ],
        "quote-props": [
            "error",
            "consistent-as-needed"
        ],
        "spaced-comment": [
            "error",
            "always"
        ]
    }
}