@babel/polyfill
🚨 As of Babel 7.4.0, this package has been deprecated in favor of directly including core-js/stable (to polyfill ECMAScript features) and regenerator-runtime/runtime (needed to use transpiled generator functions):
import "core-js/stable";
import "regenerator-runtime/runtime";已經被淘汰了
Babel includes a polyfill that includes a custom regenerator runtime and core-js.
This will emulate模仿，仿真 a full ES2015+ environment (no < Stage 4 proposals提議) and is intended to be used in an application rather than a library/tool. (this polyfill is automatically loaded when using babel-node).
This means you can use new built-ins like Promise or WeakMap, static methods like Array.from or Object.assign, instance methods like Array.prototype.includes, and generator functions (provided you use the regenerator plugin). The polyfill adds to the global scope as well as native prototypes like String in order to do this.