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Rslint

    no-anonymous-default-export

    Unreleased

    Configuration

    rslint.config.ts
    import { defineConfig, unicornPlugin } from '@rslint/core';

export default defineConfig([
  unicornPlugin.configs.recommended,
  {
    rules: {
      'unicorn/no-anonymous-default-export': 'error',
    },
  },
]);

    Rule Details

    Disallow anonymous functions and classes as the default export. Naming default exports makes it easier to find a module's implementation and use a consistent name when importing it.

    Examples of incorrect code for this rule:

    export default function () {}
export default class {}
export default () => {};

module.exports = function () {};
module.exports = class {};
exports = () => {};

    Examples of correct code for this rule:

    export default function foo() {}
export default class Foo {}

const foo = () => {};
export default foo;
module.exports = foo;

    The rule checks default exports and standalone assignments to module.exports or exports. It allows other exported values, named functions and named classes. Computed access such as module['exports'] is not checked.

    Suggestions

    An editor suggestion derives a name from the filename before its first dot, using camel case for functions and an initial capital for classes. Underscores are appended to avoid reserved names and names already used in the relevant scopes. A filename that cannot produce an identifier receives a diagnostic without a suggestion.

    For arrow functions, the suggestion introduces a const declaration and exports that identifier. It preserves comments, parentheses and the file's line ending. Suggestions are applied manually; this rule does not provide automatic fixes.

    Options

    This rule has no options.

    Differences from upstream

    Compared with eslint-plugin-unicorn v76.0.0:

    • For anonymous TypeScript functions with type parameters, the suggestion inserts the name before the type parameters. For example, export default function<T>(value: T) { return value; } becomes export default function foo<T>(value: T) { return value; } in foo.ts. Upstream places the name after <T>, producing invalid TypeScript.
    • An arrow function assigned to module.exports or exports directly inside an unbraced conditional, loop or labeled statement receives a diagnostic without a suggestion. For example, if (ready) exports = () => {}; is reported, but rslint does not suggest inserting a const declaration in that position. Add braces around the statement to make the naming suggestion available.

    Original Documentation