Problem of webpack version in webpack example

[dardinier]

Configuration:

• Operating system : Debian GNU/Linux 9
• Node.js : v8.12.0
• npm : v6.4.1
• Gulp : v3.9.1

Steps to reproduce the problem:

$ git clone https://github.com/mozilla/pdf.js
$ cd pdf.js
$ npm install
$ gulp dist-install
$ cd examples/webpack
$ npm install
$ ./node_modules/webpack/bin/webpack.js

What is the expected behavior?

Webpack should bundle files.

What went wrong?

Webpack throw an error :

$ ./node_modules/webpack/bin/webpack.js
/home/adardinier/workspace/Test/pdf.js/examples/webpack/node_modules/webpack-cli/bin/config-yargs.js:89
                                describe: optionsSchema.definitions.output.properties.path.description,
                                                                           ^

TypeError: Cannot read property 'properties' of undefined
    at module.exports (/home/adardinier/workspace/Test/pdf.js/examples/webpack/node_modules/webpack-cli/bin/config-yargs.js:89:48)
    at /home/adardinier/workspace/Test/pdf.js/examples/webpack/node_modules/webpack-cli/bin/webpack.js:60:27
    at Object.<anonymous> (/home/adardinier/workspace/Test/pdf.js/examples/webpack/node_modules/webpack-cli/bin/webpack.js:515:3)
    at Module._compile (module.js:653:30)
    at Object.Module._extensions..js (module.js:664:10)
    at Module.load (module.js:566:32)
    at tryModuleLoad (module.js:506:12)
    at Function.Module._load (module.js:498:3)
    at Module.require (module.js:597:17)
    at require (internal/module.js:11:18)

Envisaged solution :

This error comes from Webpack version. As we can see here, the problem can be solved by updating the package.json versions in the webpack example like this :

    "webpack": "^4.20.2",
    "webpack-cli": "^3.1.1",

I tried to change the versions in the package.json and to re-install all the stuff and it worked.