官网：https://angular.io/guide/npm-packages
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rxjs：Many Angular APIs return observables. RxJS is an implementation of the proposed Observables specification currently before the TC39 committee, which determines standards for the JavaScript language.
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zone.js: Angular relies on zone.js to run Angular’s change detection processes when native JavaScript operations raise events. Zone.js is an implementation of a specification currently before the TC39 committee that determines standards for the JavaScript language.