Angular Unit Test - Cannot find module “tslib”

Angular Unit Test - Cannot find module “tslib”

When running angular UT, you may encounter the error message looks like:

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Uncaught Error: Cannot find module 'tslib'
    at webpackEmptyContext (src sync:2) [<root>]
    at :9876/_karma_webpack_/d:/workspace/web/node_modules/@angular/compiler/src/core.js:19:1 [<root>]
    at :9876/_karma_webpack_/d:/workspace/web/node_modules/@angular/compiler/src/core.js:10:1 [<root>]
    at Object.../../node_modules/@angular/compiler/src/core.js
     (:9876/_karma_webpack_/d:/workspace/web/node_modules/@angular/compiler/src/core.js:16) [<root>]
    at __webpack_require__ (bootstrap:79) [<root>]
    at Module../src/lib/service/service.spec.ts (xx.service.ts:36) [<root>]
    at __webpack_require__ (bootstrap:79) [<root>]
    at webpackContext (src sync \.spec\.ts$:22) [<root>]
    at Array.map (<anonymous>) [<root>]
    at Module../src/test.ts (test.ts:23) [<root>]
    at __webpack_require__ (bootstrap:79) [<root>]
    at checkDeferredModules (bootstrap:45) [<root>]
    at :9876/_karma_webpack_/webpack/bootstrap:152:1 [<root>]
    at :9876/_karma_webpack_/main.js:156:10 [<root>]

This should be coming from Angular Core

removed:

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import { Type } from '@angular/compiler/src/core';

Using:

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import { Injectable, Type } from '@angular/core';