Koa-polyfill-io

This is a Koa middleware based on polyfill.io, which can't be stable visited in mainland & causing request timeout. therefore I create this;

本项目是基于polyfill.io 进行封装的一个Koa 中间件，由于polyfill.io 在国内访问不稳定，会出现请求过久的问题，因此为方便使用，封装了此中间件。

Install

npm install koa-polyfill-io

Usage

const koa = require('koa');
const polyfillMiddleWare = require('koa-polyfill-io');
const koaRouter = require('koa-router');
const conditional = require('koa-conditional-get');
const etag = require('koa-etag');

const app = new koa();
// in order to cache request
app.use(conditional());
app.use(etag());
const router = koaRouter();

router.get('/polyfill.min.js', polyfillMiddleWare); // use in min size
router.get('/polyfill.js', polyfillMiddleWare); // use in normal size
app.use(router.routes());
app.listen(8080);

Description

It will minimize code when request with min.js

And it's support follow queries:

• flags

  you can use props below & sperate with %7C (|), like flags=gated%7Calways;

  • gated: to identity each polyfill, it will polyfill only if native Api is not supported

  • always: include all polyfill function, no matter the browser that current request from is needed

• features

  all features available can be seen in polyfill list & api

• compression

  compression bundle with gzip (gzip compress), br (brotli compress) & identity (no compress)

• ua

  you can define user-agent yourself, if it's not provied, than the user-agent header will be used alternatively

当请求以min.js 结尾时会压缩代码

可使用以下参数：

• flags

  以下属性值可使用%7C(即|) 分隔使用， 如flags=gated%7Calways

  gated: 对每个polyfill 进行特性检测，即仅在原生Api 不支持的情况下进行 polyfill

  always: 包含所有polyfill 方法，无论当前请求的浏览器是否需要

• callback

  当polyfill 文件加载完成后执行的回调函数

• features

  参考可用的polyfill 列表及对应包含的api

• compression

  压缩方式，可选为gzip、br 或者 identity

• ua

  你可以自定义 user agent ，如果不定义，则使用header 中的user-agent