polyfills db

A database for various polyfills that includes:

• Which browsers support a feature
• Associated modules or files for each feature

Types of polyfills:

• polyfills - runtime JS polyfills for polyfills
• recast - JS transpilation using recast and ecstacy
• postcss - CSS transpilation using postcss and ecstacy

Testing on Browsers

Of course, we want to actually test each bundle on a browser. Right now, tests are in paas, so everytime you add a polyfill, checkout paas and see if hitting GET /test.html works in all your browsers. CI testing is coming!

Help Maintaining

Most updates are currently done manually. Please help add polyfills and update the relevant versions. Some helpful resources are:

• HTML5 Cross Browser Polyfills
• caniuse
• MDN
• ES Compatibility Table
• esnext and its organization
• cssnext and the postcss organization

Notes

regenerator includes es7-async-fn. If you use regenerator, be sure to not use es7-async-fn, or at least the runtime.