I'm submitting a...

[x] Feature request

Current behavior

With the new HttpClient if the responseType is set to 'json' or if it is not set (defaulted to 'json') then the JSON is parsed before being returned to the consuming code. Here is the source-code where the JSON.parse occurs:

Expected behavior

A reviver function can be configured that the HttpClient will use when parsing json. As far as the implementation, maybe an injection token can be exposed which developers can use to provide a reviver function.

What is the motivation / use case for changing the behavior?

Dates are deserialized as strings with JSON.parse. It is convenient to have dates serialized to Date objects globally via a centralized service using a reviver.