.eslintrc

{
    "env": {
        "node": true,
        "jest": true
    },
    "parser": "@babel/eslint-parser",
    "plugins": [
        "prettier",
        "flowtype",
        "@babel"
    ],
    "rules": {
        "prettier/prettier": "error",
        // The default rule wants to enforce // @flow, but we frequently have it
        // as part of the file's docstring.
        "flowtype/require-valid-file-annotation": [
            0,
            "always"
        ],
        // ---------------------------------------
        // ES6 rules.
        "constructor-super": 2,
        "no-const-assign": 2,
        "no-this-before-super": 2,
        "no-console": 0,
        "no-var": 2,
        "prefer-const": 2,
        "prefer-spread": 2,
        // We turned this off because it complains when you have a
        // multi-line string, which I think is going too far.
        "prefer-template": 0,
        // We've decided explicitly not to care about this.
        "arrow-parens": 0,
        // ---------------------------------------
        // ES6/jsx stuff that's disabled for now, but maybe shouldn't be.
        // TODO(csilvers): enable these if/when community agrees on it.
        "prefer-arrow-callback": 0,
        // We'd possibly like to remove the 'properties': 'never' one day.
        "camelcase": [
            2,
            {
                "properties": "never",
                "allow": [
                    "^UNSAFE_"
                ]
            }
        ],
        "curly": 2,
        "eqeqeq": [
            2,
            "allow-null"
        ],
        "guard-for-in": 2,
        "linebreak-style": [
            2,
            "unix"
        ],
        "max-lines": [
            2,
            1000
        ],
        "no-alert": 2,
        "no-array-constructor": 2,
        "no-debugger": 2,
        "no-dupe-class-members": 2,
        "no-dupe-keys": 2,
        "no-extra-bind": 2,
        "no-new": 2,
        "no-new-func": 2,
        "no-new-object": 2,
        "no-throw-literal": 2,
        "no-undef": 2,
        "no-unexpected-multiline": 2,
        "no-unreachable": 2,
        // NOTE: If you change the options here, be sure to update eslintrc.flow also
        "no-unused-expressions": [
            2,
            {
                "allowShortCircuit": true,
                "allowTernary": true
            }
        ],
        "no-unused-vars": [
            2,
            {
                "args": "none",
                "varsIgnorePattern": "^_*$"
            }
        ],
        "no-useless-call": 2,
        "no-with": 2,
        "one-var": [
            2,
            "never"
        ],
        // TODO(scottgrant): Add additional a11y rules as we support them.
        // ---------------------------------------
        // Stuff that's disabled for now, but maybe shouldn't be.
        // TODO(jeresig): It's an anti-pattern but it appears to be used
        // frequently in reducers, the alternative would be super-clunky.
        "no-case-declarations": 0,
        // TODO(csilvers): enable these if/when community agrees on it.
        // Might be nice to turn this on one day, but since we don't
        // use jsdoc anywhere it seems silly to require it yet.
        "valid-jsdoc": 0,
        "require-jsdoc": 0,
        "flowtype/boolean-style": [
            2,
            "boolean"
        ],
        "flowtype/define-flow-type": 1, // suppress no-undef on flow types
        "flowtype/no-dupe-keys": 2,
        // Use Flow's version of no-unused-expressions
        "flowtype/no-unused-expressions": [
            2,
            {
                "allowShortCircuit": true,
                "allowTernary": true
            }
        ],
        "flowtype/no-weak-types": 0, // allow 'any' for now
        // flow may still require parameter types in certain situations
        "flowtype/require-parameter-type": 0,
        "flowtype/require-return-type": 0,
        "flowtype/sort": 0,
        "flowtype/type-id-match": 0,
        "flowtype/use-flow-type": 1 // suppress no-unused-vars on flow types
    },
    "extends": [
        "prettier"
    ],
    "globals": {
        "DEBUG": "readonly",
        "Promise": "readonly",
        "Set": "readonly",
        "__DEV__": "readonly"
    }
}