Babel在使用Create-React-App时不翻译Map（）

Question

I have a React App using Create-React-App. I've used the Map() datastructure included in ES6 in my app. However, in IE11 it does not work. Shouldn't Babel (under the hood of Create-React-App - I did not eject) take care of this?

If not, is there there any solution for that?

Answer 1

As others already mentioned, you are going to need a polyfill to add the functionality when it's not natively supported by the browser in question. Since you're already using Babel, the easiest way to do this is by using a Babel polyfill.

If you don't want to add another dependency, you can use the Map polyfill found here .

Answer 2

No.

Use babel-polyfill for cross-browser babel support:

npm install --save babel-polyfill

If you're using webpack/browserify then here's how you should incorporate the polyfill:

module.exports = {
  entry: ["babel-polyfill", "./app/js"]
};

If you're still unclear, read the documentation here .