こんにちは！
角度8でpeerJを使用しようとしましたが、失敗しました。
アプリにインポートできませんでした。

この問題を表示するための小さなプロジェクト（https://github.com/furozen/PeerJs-example）を作成しました：

1

import * as Peer from 'peerjs';

コンパイルエラー：

ERROR in src/app/app.component.ts:14:16 - error TS2351: Cannot use 'new' with an expression whose type lacks a call or construct signature.

14     let peer = new Peer();
                  ~~~~~~~~~~

  src/app/app.component.ts:3:1
    3 import * as Peer from 'peerjs';
      ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    Type originates at this import. A namespace-style import cannot be called or constructed, and will cause a failure at runtime. Consider using a default import or import require here instead.

2

import { Peer } from 'peerjs'

コンパイルエラー：

ERROR in src/app/app.component.ts:3:10 - error TS2305: Module '"../../node_modules/peerjs"' has no exported member 'Peer'.

3 import { Peer } from 'peerjs'
         ~~~~

3

import Peer from 'peerjs'

コンパイルエラー：

WARNING in ./node_modules/peerjs/dist/peerjs.min.js 1:292-296
Critical dependency: the request of a dependency is an expression

ランタイム：

Uncaught ReferenceError: parcelRequire is not defined
    at push../node_modules/peerjs/dist/peerjs.min.js.parcelRequire.vHo1 (peerjs.min.js:1)
    at Object../node_modules/peerjs/dist/peerjs.min.js (peerjs.min.js:1)
    at __webpack_require__ (bootstrap:79)
    at Module../src/app/app.component.ts (main.js:112)
    at __webpack_require__ (bootstrap:79)
    at Module../src/app/app.module.ts (app.component.ts:11)
    at __webpack_require__ (bootstrap:79)
    at Module../src/main.ts (main.ts:1)
    at __webpack_require__ (bootstrap:79)
    at Object.0 (main.ts:12)

4

import Peer = require('peerjs');

コンパイルエラー：

    ERROR in src/app/app.component.ts(3,1): error TS1202: Import assignment cannot be used when targeting ECMAScript modules. Consider using 'import * as ns from "mod"', 'import {a} from "mod"', 'import d from "mod"', or another module format instead

ランタイム：

AppComponent_Host.ngfactory.js? [sm]:1 ERROR ReferenceError: Peer is not defined
    at new AppComponent (app.component.ts:15)
    at createClass (core.js:27863)
    at createDirectiveInstance (core.js:27685)
    at createViewNodes (core.js:38315)
    at createRootView (core.js:38187)
    at callWithDebugContext (core.js:39716)
    at Object.debugCreateRootView [as createRootView] (core.js:38953)
    at ComponentFactory_.create (core.js:26827)
    at ComponentFactoryBoundToModule.create (core.js:22791)
    at ApplicationRef.bootstrap (core.js:35343)