Polyfill service middleware for koa.

npm install koa-polyfill-service --save

const polyfill = require('koa-polyfill-service')
app.use(polyfill())

The options for the middleware, other than those passed directly to getPolyfillString, are:

• maxAge - the max age for the polyfill's cache control, defaulting to 2 weeks
• path - route to serve lib, defaulting to /polyfill.js
• features - the same as getPolyfillString option, but defaulting to {default: {}}.

Disclaimer: 🙈 shameless copy of koa Polyfills, but using Polyfill service.