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doc: clarify options for fs.watchFile() #2425

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doc: clarify options for fs.watchFile() #2425

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11 changes: 6 additions & 5 deletions doc/api/fs.markdown
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Original file line number Diff line number Diff line change
Expand Up @@ -557,11 +557,12 @@ The synchronous version of `fs.appendFile`. Returns `undefined`.
Watch for changes on `filename`. The callback `listener` will be called each
time the file is accessed.

The second argument is optional. The `options` if provided should be an object
containing two members a boolean, `persistent`, and `interval`. `persistent`
indicates whether the process should continue to run as long as files are
being watched. `interval` indicates how often the target should be polled,
in milliseconds. The default is `{ persistent: true, interval: 5007 }`.
The `options` argument may be omitted. If provided, it should be an object. The
`options` object may contain a boolean named `persistent` that indicates
whether the process should continue to run as long as files are being watched.
The `options` object may specify an `interval` property indicating how often the
target should be polled in milliseconds. The default is
`{ persistent: true, interval: 5007 }`.

The `listener` gets two arguments the current stat object and the previous
stat object:
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