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1. Is this a client library issue or a product issue?
   This is the client library for . We will only be able to assist with issues that pertain to the behaviors of this library. If the issue you're experiencing is due to the behavior of the product itself, please visit the Support page to reach the most relevant engineers.

2. Did someone already solve this?

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• Search the issues on our "catch-all" repository: https://github.com/googleapis/google-cloud-node
• Search or ask on StackOverflow (engineers monitor these tags): http://stackoverflow.com/questions/tagged/google-cloud-platform+node.js

3. Do you have a support contract?
   Please create an issue in the support console to ensure a timely response.

If the support paths suggested above still do not result in a resolution, please provide the following details.

Environment details

• OS: Windows 10.0.18362
• Node.js version: 12.13.0
• npm version: 6.12.0
• google-auth-library version: 6.1.1.

Steps to reproduce

1. Call google.classroom("v1").courses.list(), or any related API (courses.teacher, courses.student, etc.)
2. Keep calling until a quota threshold is reached (should get a 429 error code).
3. Look at the typeof the error.code returned. It will be a 'number', but should be a 'string'.

Looks like
err.code = body.error.code;
around line 95 in processError() in transporters.js needs to ensure the assigned value is a string.

Line 112 handles this by calling toString(). Might be other lines that need to ensure the code field is a string type.

Making sure to follow these steps will guarantee the quickest resolution possible.

Thanks!