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doc: add explicit declaration of fd with null val
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In example of implementing a writable stream with extending on
Writable add explicit declaration of 'fd' (file descriptor)
variable with null value.
It will make this example more similar to readable stream's one.
And will make it easier to figure out in topic.

PR-URL: #40704
Reviewed-By: Tobias Nießen <tniessen@tnie.de>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Minwoo Jung <nodecorelab@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
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Gena888 authored and danielleadams committed Feb 1, 2022
1 parent f9cf50f commit 6a9db2e
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1 change: 1 addition & 0 deletions doc/api/stream.md
Original file line number Diff line number Diff line change
Expand Up @@ -2470,6 +2470,7 @@ class WriteStream extends Writable {
constructor(filename) {
super();
this.filename = filename;
this.fd = null;
}
_construct(callback) {
fs.open(this.filename, (err, fd) => {
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