Question 1

es6-shim vs core-js: which is better for polyfilling ES6?

Accepted Answer

es6-shim focuses strictly on ES6 with spec-compliant shims, while core-js covers more ECMAScript versions and features. Choose es6-shim for reliable ES6-only polyfilling, or core-js for broader compatibility including newer versions.

Question 2

How to include es6-shim in a browser without using npm?

Accepted Answer

You can include es6-shim via a script tag before your other scripts, as mentioned in the installation section. Ensure to also include es5-shim first for full compatibility with legacy browsers.

Question 3

Does es6-shim work with Internet Explorer 11?

Accepted Answer

Yes, es6-shim is designed for legacy browsers including IE11, but note that some features like Object.setPrototypeOf have caveats in older versions, as detailed in the README under Caveats.

Question 4

What ES6 features are NOT supported by es6-shim?

Accepted Answer

es6-shim does not include WeakMap due to technical limitations, and String.prototype.normalize requires an external package. Otherwise, it comprehensively covers most ES6 features listed in the Safe shims section.

Question 5

How to use es6-shim in a Node.js project?

Accepted Answer

Install it via npm with 'npm install es6-shim', then require it in your code. The README provides usage examples with Node.js, including getting started snippets.

Question 6

Is es6-shim still needed if I'm using Babel?

Accepted Answer

Babel transpiles syntax but doesn't polyfill built-ins; es6-shim can complement Babel by providing runtime polyfills for APIs like Promise and Map in environments that lack native support.

es6-shim

What is es6-shim?

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