What is the use of polyfills.ts file in Angular

Question

polyfills.ts file is auto generated while creating an Angular application using Angular Cli. Can anyone explain me what is the use of polyfills.ts file in Angular application.

Answer 1

Basically polyfills compatible for different browsers especially IE old versions IE8, IE9 and IE10. Angular has new features which written in ES6 and typescript, so polyfills helps to compatible with different browsers.