rpclibrary/test/TestBackend.ts

import { RPCServer } from '../src/Backend'

new RPCServer(20000, [{
    name: "HelloWorldRPCGroup",
    publicRPCs: () => [],
    localRPCs: () => [{
        type: 'Call',
        name: 'echo',
        call: async (s:string) => s,
    }]
}])