Bun.watch - fast and reliable file watching api

[vjpr]

File watching is very common.

For node.js, chokidar is the most popular.

There is also Facebook's watchman which runs a daemon that ensures at most one callback is setup per directory. It is used by default if available in Jest.

Would be nice to have a good reliable api for file watching. There are a lot of issues with fs.watch.

It would be really nice to have an implementation that could work well with a persistent watcher (like watchman does).

Related

fs.watch is not implemented yet: #832

[Jarred-Sumner]

We will add a builtin watch API

Haven't gotten to it yet

[tuyen-at-work]

@vjpr @Jarred-Sumner Looks like it is done now?
https://bun.sh/guides/read-file/watch

[bjesuiter]

I'm not sure.
This seems not to emit all events when they come in rapid succession.

[7flash]

I'm not sure. This seems not to emit all events when they come in rapid succession.

really?? how many events you emit to manifest this behaviour?

[bjesuiter]

I'm not sure. This seems not to emit all events when they come in rapid succession.

really?? how many events you emit to manifest this behaviour?

I'm watching the Build Output of ng Build --Watch, so nothing too crazy.
at most, there are around 350 file changes after the build.

Since the angular cli emits files relatively random, I buffer all file change events and emit them after 1 second of no change to handle all file changes after a build at once.
And the bun watcher did emit less events than chokidar.

Maybe @guest271314 is right and it only emitted "rename" events. I don't remember, it's too long ago that I tried it.