initSqlJs doesn't throw when wasm cannot be fetched

import initSqlJs from 'sql.js';

(async () => {
  await initSqlJs();
})();

The promise will never settle, if the file cannot be fetched. The console will output

Uncaught (in promise) TypeError: Failed to fetch

but the promise remains in the "pending" state, so I guess the fetch is running outside the normal promise chain

Start at the initSqlJs entry point and reproduce the case where the WASM file cannot be fetched. Trace the fetch error through initialization and ensure the returned promise rejects rather than remaining pending; verify the failure is observable to the caller.