fix(build): watch mode - replace rollup.watch with chokidar

[stafyniaksacha]

Description

Using rollup.watch comes with some leaks: we can not watch for configuration changes neither control what is built.
This is an alternative approach that replace the use of rollup.watch with a custom chokidar that trigger internal build (so we can not have different behaviour while using the watch option)

Caveat:
This comes with a breaking change in the watcher configuration from RollupWatcher (rollup) to WatchOptions (chokidar)

Fix #3108
Fix #3068

What is the purpose of this pull request?

• Bug fix
• New Feature
• Documentation update
• Other

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[patak-dev]

About the breaking change, could we still accept rollup watch options and issue a deprecation warning?

  watch?: WatcherOptions | WatchOptions | null // WatcherOptions is deprecated

I think we could release this as a minor if we do this without breaking user setups.

[patak-dev]

For reference, the conflicts were caused by #3043, that already fixes #3068

[stafyniaksacha]

Should be ok now

[underfin]

I don't think it is a better fix, the rollup watch build will cache module transform result and other perfmance optimized. This fix will lost the optimzied of rollup. I think we should found the reason with issue then fixed them.

[CHOYSEN]

I think additional implementation of watch mode may bring other issues like affect this.addwatchfile in the plugin hook.

[patak-dev]

@stafyniaksacha we discussed this with Evan about this approach, and @underfin has a point here. We should try to use rollup watch mode as in your original PR, as there are performance benefits. A few bugs were solved already by #3512 and related PRs. The plugin caches were not reset when rebuilding.
I think we should close this PR for the moment. Let's keep improving the rollup-based build mode at least until we hit a roadblock.