typescript usage error

[sancelot]

I am unable to use the library in typescript:

import * as c from "@open-rpc/client-js";
const transport = new c.HTTPTransport("http://localhost:8545");
const client = new c.Client(new c.RequestManager([transport]));
const result = client.request({method: "addition", params: [2, 2]});
// => { jsonrpc: '2.0', id: 1, result: 4 }

webpack error appears:

ERROR in ./node_modules/@open-rpc/client-js/build/index.js 7:39-66
Module not found: Error: Can't resolve './RequestManager' in 'E:\BABYLONJS\node_modules@open-rpc\client-js\build'
@ ./index.ts 1:0-41 2:20-35 3:17-25 3:30-46

ERROR in ./node_modules/@open-rpc/client-js/build/index.js 9:46-91
Module not found: Error: Can't resolve './transports/EventEmitterTransport' in 'E:\BABYLONJS\node_modules@open-rpc\client-js\build'
@ ./index.ts 1:0-41 2:20-35 3:17-25 3:30-46

ERROR in ./node_modules/@open-rpc/client-js/build/index.js 11:38-75
Module not found: Error: Can't resolve './transports/HTTPTransport' in 'E:\BABYLONJS\node_modules@open-rpc\client-js\build'
@ ./index.ts 1:0-41 2:20-35 3:17-25 3:30-46

ERROR in ./node_modules/@open-rpc/client-js/build/index.js 13:43-85
Module not found: Error: Can't resolve './transports/WebSocketTransport' in 'E:\BABYLONJS\node_modules@open-rpc\client-js\build'
@ ./index.ts 1:0-41 2:20-35 3:17-25 3:30-46

ERROR in ./node_modules/@open-rpc/client-js/build/index.js 15:51-101
Module not found: Error: Can't resolve './transports/PostMessageWindowTransport' in 'E:\BABYLONJS\node_modules@open-rpc\client-js\build'
@ ./index.ts 1:0-41 2:20-35 3:17-25 3:30-46

ERROR in ./node_modules/@open-rpc/client-js/build/index.js 17:51-101
Module not found: Error: Can't resolve './transports/PostMessageIframeTransport' in 'E:\BABYLONJS\node_modules@open-rpc\client-js\build'
@ ./index.ts 1:0-41 2:20-35 3:17-25 3:30-46

ERROR in ./node_modules/@open-rpc/client-js/build/index.js 19:14-32
Module not found: Error: Can't resolve './Error' in 'E:\BABYLONJS\node_modules@open-rpc\client-js\build'
@ ./index.ts 1:0-41 2:20-35 3:17-25 3:30-46

ERROR in ./node_modules/@open-rpc/client-js/build/index.js 21:31-50
Module not found: Error: Can't resolve './Client' in 'E:\BABYLONJS\node_modules@open-rpc\client-js\build'
@ ./index.ts 1:0-41 2:20-35 3:17-25 3:30-46