Operating System

N/A

Browser Version

N/A

Firebase SDK Version

[email protected], @firebase/[email protected]

Firebase SDK Product:

Auth

Describe your project's tooling

Next.js with Vercel Edge runtime.

Describe the problem

When running Firebase, I get the following error:

@firebase/auth: Auth (10.3.0): INTERNAL ASSERTION FAILED: Could not find fetch implementation, make sure you call FetchProvider.initialize() with an appropriate polyfill

Steps and code to reproduce issue

I checked the code and I believe it's quite simple to verify this is a bug, and I will describe it below. Thus I don't provide a detailed repilication. Let me know if you still want me to prepare a minimal repo to reproduce this bug.

• The package @firebase/[email protected] provides multiple exports, shown in its package.json. One of them is dist/esm2017/index.js.
• dist/esm2017/index.js just re-exports some objects from dist/esm2017/index-9a76d29a.js.
• dist/esm2017/index-9a76d29a.js defines class FetchProvider at line 742, and calls FetchProvider.fetch() at line 915 and line 1470. However, FetchProvider.initialize() has never been called in this file, and self is not a standard JavaScript global property (it only exists in browser environment). That's why I get this error.