Overview

• math.mojom is the definition of the service
• math.ts is auto-generated code based on Mojo definition: it gives a stub and a type definition of an implementation
• mathImpl.ts is an actual implementation of Math service.
• mathRPC.ts is the necessary code to call a remote implementation of Math service via JSON-RPC (using a RPCPeer). It can be auto-generated as well.

In the best world, dev just have to define math.mojom and implement mathImpl.ts, the logic of the service. The rest is code-generated.

Local usage

import { Math } from './math.ts'
import { MathImpl } from './MathImpl'

const math = new Math(new MathImpl());

const { sum } = await math.add({a: 1, b: 2});
// sum is 3

Remote usage

In process A (server):

import { Math } from './math.ts'
import { MathImpl } from './mathRPC.ts'

const rpcPeer = getRPCPeer();

const math = new Math(new MathImpl(rpcPeer));

const { sum } = await math.add({a: 1, b: 2});
// sum is 3

In process B (usage):

import { MathImpl } from './MathImpl'
import { bindImpl } from './mathRPC.ts'
const rpcPeer = getRPCPeer();

bindImpl(rpcPeer, new MathImpl());