how can bunFile.size be immediate?

[yukulele]

considering this code:

const floppyFileSize = new file('/dev/fd0/info.txt').size

I was expecting to have an await somewhere, but no.

How bunFile.size can get the file size immediately?
Is it a synchronous (blocking) call?

[melroy89]

Yes it's a blocking call. See https://bun.sh/docs/api/file-io

[melroy89]

But using .text() of .stream() is not a blocking call.

[yukulele]

Unless I've misread it, the API only says that .size returns the number of bytes, but it doesn't explain how it works, nor does it specify that it's blocking.

[melroy89]

I suspect without looking at the code. The file size is read from partition information eg inode data under Linux. Without the need to actually read the file itself.

Reading the data from the file is however more i/o intensive thus asynchrone functions are present. Avoiding to block the main loop under Javascript.