ReadonlylockedThe locked read-only property of the WritableStream interface returns a boolean indicating whether the WritableStream is locked to a writer.
The abort() method of the WritableStream interface aborts the stream, signaling that the producer can no longer successfully write to the stream and it is to be immediately moved to an error state, with any queued writes discarded.
Optionalreason: anyThe close() method of the WritableStream interface closes the associated stream. All chunks written before this method is called are sent before the returned promise is fulfilled.
The getWriter() method of the WritableStream interface returns a new instance of WritableStreamDefaultWriter and locks the stream to that instance. While the stream is locked, no other writer can be acquired until this one is released.
The seek() method of the FileSystemWritableFileStream interface updates the current file cursor offset to the position (in bytes) specified when calling the method.
The truncate() method of the FileSystemWritableFileStream interface resizes the file associated with the stream to the specified size in bytes.
The write() method of the FileSystemWritableFileStream interface writes content into the file the method is called on, at the current file cursor offset.
The
FileSystemWritableFileStreaminterface of the File System API is a WritableStream object with additional convenience methods, which operates on a single file on disk. The interface is accessed through the FileSystemFileHandle.createWritable() method. Available only in secure contexts.MDN Reference