[Home](./index.md) > [@firebase/auth](./auth.md) > [AuthErrorMap](./auth.autherrormap.md) ## AuthErrorMap interface A mapping of error codes to error messages. Signature: ```typescript export interface AuthErrorMap ``` ## Remarks While error messages are useful for debugging (providing verbose textual context around what went wrong), these strings take up a lot of space in the compiled code. When deploying code in production, using [prodErrorMap](./auth.proderrormap.md) will save you roughly 10k compressed/gzipped over [debugErrorMap](./auth.debugerrormap.md). You can select the error map during initialization: ```javascript initializeAuth(app, {errorMap: debugErrorMap}) ``` When initializing Auth, [prodErrorMap](./auth.proderrormap.md) is default.