Bi-directional routing

NB: This is nowhere near production ready at time of writing.

Goals

HTTP routes that can be shared by clients and server

I should be able to define a route at GET /widgets/{id} and use that route to both:

• Match a request on the server side, then route it to a handler function
• Create a request on the client side and pass it to an HttpHandler

By sharing the routes between client and server I avoid bugs with my client sending the wrong shaped requests to my server.

Fully type-safe contracts for both client and server

If I have a route GET /widgets/{widgetId} that returns a json-serialised response body containing a Widget, I want to be able to give my server a handler function that knows nothing about http, like:

(args: {widgetId: string}) => Promise<Widget>

...and have the server destructure the request into that shape and then serialise the function result into an HttpResponse.

On the client side, I want to be able to generate a function with the same signature that takes care of serialising to an HttpRequest, sending to an HttpHandler, then deserialising from HttpResponse.

Examples

See client.test.ts for an example of a complete round trip from client to server and back.