quick-lint-js

Find bugs in JavaScript programs.

E0076: cannot declare and export variable with 'export default'

In modules, you can declare and export a variable at the same time. However, it is a syntax error to declare and export a variable by default:

export default let cache = {};

To fix this error, export by name, not by default:

// Import using:
// import {cache} from "./cache.mjs";
export let cache = {};

Alternatively, to export by default, declare the variable then export it in a separate statement. Note that this means importers of the variable cannot assign to the variable (but the object can still be modified):

// Import using:
// import cache from "./cache.mjs";
let cache = {};
export default cache;

Documentation for other errors