Webpack: inject bundle (or polyfills) on the fly

webpack dynamic require.md

• promise-loader returns a promise require("promise?bluebird!./file.js")(file => ...);
• bundle-loader returns a callback require("bundle!./file.js")(file => ...);

Both are using require.ensure() behind the scene.

Manually :

if (typeof Promise === 'undefined') {
  require.ensure([], (require) => {
    require('imports?this=>window!es6-promise')
  })
}

if (typeof fetch === 'undefined') {
  require.ensure([], (require) => {
    require('imports?self=>window!whatwg-fetch')
  })
}