Add a toggle to disable ProgressPlugin

[beeman]

This patch adds a command line option that can disable the Webpack ProgressPlugin, keeping it enabled by default.

Disabling this progress speeds up the initial build that ng serve does quite significantly in our setup, where we use pm2 to start ng serve.

The build process of our app went down from about 25 to 11 seconds.

Please let me know if it needs any adjustments to get merged.

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[beeman]

@googlebot I signed it!

Company name is Fullcube

[clydin]

There's already a PR for this: #2858; Although it appears to have stalled.

[beeman]

You're right @clydin, didn't check for it.

It seems like the other PR adds more functionality, I'm personally only interested in hiding the progress.

[hansl]

We're looking into these 2 PRs, not sure yet what we're going to do. We're mostly interested in the claim that

The build process of our app went down from about 25 to 11 seconds.

That's a huge difference that should not be only explained by the progress plugin, so we're really curious.

Note: Just as an FYI, if we decide to go with this PR we're going to ask you to sign the CLA.

[beeman]

@hansl we see this performance gain in one of our apps. We run this app inside a Docker container, as a process in pm2. It's probably the way pm2 outputs the progress that makes it so much slower.

If it helps I can create a demo that shows the behavior.

Re: the CLA, I should have signed it. Is it not visible?

[googlebot]

CLAs look good, thanks!

[hansl]

It is now. You have to comment here for the CLA bot to check again.

[filipesilva]

Superseded by #2858, which is now updated.

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