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This feature is non-standard and is not on a standards track. Do not use it on production sites facing the Web: it will not work for every user. There may also be large incompatibilities between implementations and the behavior may change in the future.


The flush method is used to ensure any change made to a file is properly written on disk.

For performance reasons, a LockedFile object buffers all its operation in memory. This allows fast writing and reading operations. Periodically, the data are written onto disk. However, if something goes wrong before that, some operations can be lost. To avoid that, it's possible to force a write onto the disk by calling the flush method.


var request = instanceOfLockedFile.flush();


A FileRequest object to handle the success or failure of the operation.


Specification Status Comment
FileSystem API Editor's Draft Draft proposal

See also

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 Contributors to this page: fscholz, kscarfone, Jeremie
 Last updated by: fscholz,