REST RPC for TypeScript

This library allows you to define your RESTful API in a TypeScript interface. That interface definition could be share between your backend and frontend code bases. From that interface library can generate client and server stubs.

Uses Koa.JS for server stubs and Fetch to make client requests.

Example

Installation

yarn add typescript-rest-rpc

Code

shared.ts:

export interface Backend {
    login({ username, password }): Promise<{ token: string }>
}

server.ts:

import { createServerRouter } from "typescript-rest-rpc/lib/server"

class BackendImpl implements Backend {
    async login({ username, password }): Promise<{ token: string }> {
        if (username == "admin" && password == "123456")
            return { token: "ok" }

        throw new BadRequest("Invalid login or password")
    }
}

const backendRouter = createServerRouter("/api", new BackendImpl())
app.use(backendRouter.routes())

client.ts:

import { createClient } from "typescript-rest-rpc/lib/client"

const client: Backend = createClient("http://localhost:9090/api")
console.log(await client.login({ username: "admin", password: "123456" }))

With this code you can even Ctrl-Click from your client code to your backend implementation to quick find how API is implemented!

Features

• Generating client and server RPC proxies based on zero-config TS interface.
• File upload support via multipart encoding (uses koa-multer under the hood).
• Binary data download.
• JSON bodies auto-parsing with Date revival.
• Supported client envs: Node.JS (with isomorphic-fetch), browser, react-native(see notes).
• Generation of OpenAPI (Swagger) YAMLs with API description

Implementation flaws

• untyped File in Multipart definition
• untyped File in binary download
• ctx parameter is untyped and should be defined in the base interface

Notes on the implementation

React-Native clients

For generating clients ES6 Proxy is used. However, React-Native doesn't support ES6 proxy on some devices, see this RN Issue. And no polyfills could exist that will handle dynamic properties. So for React Native you should explicitly list your interface operations:

export let backend: Backend = createClient(url, { ... }, 
    [ "login", "resetPassword", etc ]
)