Emit progress-update event on the listeningApp, allowing update progress to be obtained in the node API.

[pfdgithub]

• This is a bugfix
• This is a feature
• This is a code refactor
• This is a test update
• This is a docs update
• This is a metadata update

For Bugs and Features; did you add new tests?

Motivation / Use-Case

Breaking Changes

Additional Info

Just like in the browser, we can now get the compilation progress of the current project in the node API.

new webpackDevServer(webpack, config).listen(port, hostname, function (err) {
  this.on('progress-update', ({ percent, msg }) => {
    console.log(`${percent}% - ${msg}.`);
  });
});

[jsf-clabot]

All committers have signed the CLA.

[alexander-akait]

Please accept CLA and add tests

[alexander-akait]

Please accept CLA and add tests

[codecov]

Codecov Report

Merging #1666 into master will decrease coverage by 0.32%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           master    #1666      +/-   ##
==========================================
- Coverage   84.39%   84.06%   -0.33%     
==========================================
  Files           7        7              
  Lines         519      521       +2     
  Branches      159      160       +1     
==========================================
  Hits          438      438              
- Misses         64       65       +1     
- Partials       17       18       +1

Impacted Files	Coverage Δ
lib/Server.js	79.52% <0%> (-0.42%)	⬇️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update bf99c26...ee98dc3. Read the comment docs.

[alexander-akait]

Please accept CLA

[hiroppy]

Friendly ping @pfdgithub