typed-forge-bridge

A small TypeScript library which introduces end-to-end type-safety into your Atlassian Forge Apps!

Usage

Centrally define what the API of your FaaS backend is supposed to look like:

// types.ts
import { ForgeEndpoint } from "@seibert/typed-forge-bridge";

type User = {
  id: string,
  name: string,
  email: string,
};

type GetUserParams = {
  id: string,
};

type CreateUserParams = {
  name: string,
  email: string,
};

export const apiDefinition = {
  getUser: new ForgeEndpoint<GetUserParams, User>(),
  createUser: new ForgeEndpoint<CreateUserParams, void>(),
};

We can now use this definition to infer the types of the resolver's handler functions.

// index.ts
import Resolver from "@forge/resolver";
import { define } from "@seibert/typed-forge-bridge";
import { apiDefinition } from "@shared/types";

const resolver = new Resolver();
// TypeScript ensures that this object implements all the endpoints defined 
// in apiDefinition
define<typeof apiDefinition>(resolver, {
  // TypeScript can infer that payload is of type GetUserParams and this 
  // function is expected to return a User
  getUser: async ({ payload, context }) => {
    // retrieve user ...
    return user;
  },
  // TypeScript can infer that payload is of type CreateUserParams and this 
  // function is expected to return void
  createUser: async ({ payload }) => {
    // create user ...
  }
});
export const handler = resolver.getDefinitions();

And on the client-side we can infer a fully typed API client for the FaaS backend.

// CreateUserButton.tsx
import { invoke } from "@forge/bridge";
import { buildClient } from "@seibert/typed-forge-bridge";
import { apiDefinition } from "@shared/types";

// this client now has a method for each endpoint defined in apiDefinition
export const bridgeClient = buildClient(apiDefinition, invoke);

function CreateUserButton() {
  return <button
    onClick={ async () => {
      // the method createUser expects CreateUserParams and returns void as 
      // defined in apiDefinition
      await bridgeClient.createUser({ 
        name: "Max Mustermann", 
        email: "[email protected]",
      });
    } }
  >
    create user
  </button>;
}