Error message Encountered by Angular unit test: Uncaught Error – Cannot find module tslib

My unit test source code:

@Component({
  selector: 'cx-host'.template: ` <div id="a" [cxFocus]="{ autofocus: true, refreshFocus: model.uid }"></div>`.changeDetection: ChangeDetectionStrategy.Default,
})
class MockComponent {
  model = "";
}
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Change the code for import from the following figure to:

from '@angular/core' 
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The problem goes away

More of Jerry’s original articles can be found in “Wang Zixi” :