errorutils does not work with wrapped errors

[Azuka]

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[REQUIRED] Step 2: Describe your environment

• Operating System version: any
• Firebase SDK version: v4
• Library version: current
• Firebase Product: auth

[REQUIRED] Step 3: Describe the problem

Related to #416, a wrapped firebase internal error cannot be introspected

Steps to reproduce:

https://github.com/firebase/firebase-admin-go/blob/61c6c041bf807c045f6ff3fd0d02fc480f806c9a/internal/errors.go#L100

Relevant Code:

// err works with errorutils.IsNotFound
_, err := authClient.GetUserByEmail(ctx, "[email protected]")
// errorutils.IsNotFound doesn't work
err = fmt.Errorf("[AuthService] %w")

Solution

Use errors.As instead of a simple typecast. I can open a pull request right away.

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