Type Definitions
Firebase Instance ID is deprecated. Please use Firebase Installations instead.
The following type definitions are available globally.
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                  @related FIRInstanceID The completion handler invoked when the InstanceID token returns. If the call fails we return the appropriate error codeas described below.DeclarationSwift typealias InstanceIDTokenHandler = (String?, Error?) -> VoidParameterstokenThe valid token as returned by InstanceID backend. errorThe error describing why generating a new token failed. See the error codes below for a more detailed description. 
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                  @related FIRInstanceID The completion handler invoked when the InstanceID deleteTokenreturns. If the call fails we return the appropriateerror codeas described belowDeclarationSwift typealias InstanceIDDeleteTokenHandler = (Error) -> VoidParameterserrorThe error describing why deleting the token failed. See the error codes below for a more detailed description. 
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                  @related FIRInstanceID The completion handler invoked when the app identity is created. If the identity wasn’t created for some reason we return the appropriate error code. DeclarationSwift typealias InstanceIDHandler = (String?, Error?) -> VoidParametersidentityA valid identity for the app instance, nil if there was an error while creating an identity. errorThe error if fetching the identity fails else nil. 
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                  @related FIRInstanceID The completion handler invoked when the app identity and all the tokens associated with it are deleted. Returns a valid error object in case of failure else nil. DeclarationSwift typealias InstanceIDDeleteHandler = (Error?) -> VoidParameterserrorThe error if deleting the identity and all the tokens associated with it fails else nil. 
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                  @related FIRInstanceID The completion handler invoked when the app identity and token are fetched. If the identity wasn’t created for some reason we return the appropriate error code. DeclarationSwift typealias InstanceIDResultHandler = (InstanceIDResult?, Error?) -> VoidParametersresultThe result containing an identity for the app instance and a valid token, nil if there was an error while creating the result. errorThe error if fetching the identity or token fails else nil.