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doc: warn about relying on fs gc close behavior #27972

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doc: warn about relying on fs gc close behavior #27972

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doc: warn about relying on fs gc close behavior
benjamingr May 30, 2019
6b39707
Update doc/api/fs.md
benjamingr May 30, 2019
eefdd6e
Update doc/api/fs.md
benjamingr May 30, 2019
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9 changes: 7 additions & 2 deletions doc/api/fs.md
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Expand Up @@ -3733,9 +3733,14 @@ added: v10.0.0

A `FileHandle` object is a wrapper for a numeric file descriptor.
Instances of `FileHandle` are distinct from numeric file descriptors
in that, if the `FileHandle` is not explicitly closed using the
`filehandle.close()` method, they will automatically close the file descriptor
in that they provide an object oriented API for working with files.

If a `FileHandle` is not closed using the
`filehandle.close()` method, it might automatically close the file descriptor
and will emit a process warning, thereby helping to prevent memory leaks.
Please do not rely on this behavior in your code because it is unreliable and
your file may not be closed. Instead, always explicitly close `FileHandle`s.
Node.js may change this behavior in the future.

Instances of the `FileHandle` object are created internally by the
`fsPromises.open()` method.
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