webpack instructions can't work with last worker-loader versions

[fdaveine]

I followed the recommendations given here to use pdf.js 2.6.347 with webpack.

It mention that:

...(configuring worker-loader is not necessary; just installing it is sufficient).

It's no longer the case with the last version of worker-loader (v3.0.7), and since the version v3.0.0 I believe, due to a breaking change in this package:

The filename option now default to [name].worker.js, which cause webpack to generate a pdf.worker.worker.js file instead of the expected pdf.worker.js.

To make webpack generate the proper file, I had to update a line inside /external/dist/webpack.js as mention bellow:

var PdfjsWorker = require("worker-loader?esModule=false&filename=[name].js!pdfjs-dist/build/pdf.worker.js");

(I added &filename=[name].js option, for worker-loader not to add its new suffix)

[fdaveine]

Let me know if it would be helpful that I make a PR for this.

[timvandermeij]

A PR for this would be very welcome, most likely together with a small change to the README file to say that at least worker-loader version 3.0.0 or higher is required now; thanks!