AuthService.isPrincipal()

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Checks if the given credentials are of the given type, and narrows the TypeScript type accordingly if there's a match.

Signature:

isPrincipal<TType extends keyof BackstagePrincipalTypes>(credentials: BackstageCredentials, type: TType): credentials is BackstageCredentials<BackstagePrincipalTypes[TType]>;

Parameters

Parameter	Type	Description
credentials	BackstageCredentials
type	TType

**Returns:**

credentials is BackstageCredentials<BackstagePrincipalTypes[TType]>