Log after subsequent compilations in --watch mode

[nicolo-ribaudo]

Q	A
Fixed Issues?	Fixes #7926, Closes #6320
Patch: Bug Fix?
Major: Breaking Change?
Minor: New Feature?	Yes
Tests Added + Pass?	Yes
Documentation PR Link
Any Dependency Changes?
License	MIT

This is a revision of #6320.

1. I used the same message that we already use for the first compilation
2. I removed the --noisy option. We already have --quiet and --verbose, and a third option would be too much (unless we implement something like --loglevel). I made it the default behavior since it just replicates what @babel/cli already does.
3. I used lodash/debounce instead of a custom implementation.

[JLHwung]

Will compiledFiles be incremented twice if a single file is modified twice?

[nicolo-ribaudo]

With the current implementation, if it is modified twice in a very short period of time, yes.

Do you think that the memory/complexity of using a Set with the file paths instead of the simple counter? (This may look like a rhetorical question, but it's not 😅)

[JLHwung]

On devtools like Babel I prefer correctness over performance unless it becomes our bottleneck.

On the other hand, thinking of the DX, does Successfully compiled # files with babel really deliver value? I mean as a developer I would not care how many files are compiled, especially when in watch mode. In Babel repo we are printing the compiled path, execution timestamp in watch mode. If one is changing a single file using babel-cli, it will keep printing successfully compiled 1 file with Babel so babel-cli can not assure users that the file has been compiled after they saved it.

What about printing things like "successfully compiled after 346ms", not ideal but at least they are more likely to differ across different runs.

I am okay to leave it as-is and address this in a separate DX PR.

[existentialism]

Yeah I'm up for adjusting the message too, in a follow-up.

[nicolo-ribaudo]

Ok 👍

[nicolo-ribaudo]

It now logs

Successfully compiled 3 files with Babel (123ms).

[babel-bot]

Build successful! You can test your changes in the REPL here: https://babeljs.io/repl/build/22343/

[existentialism]

❤️

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