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doc: document process.std*.fd
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Fixes: #28386
Refs: #31292
Refs: nodejs/help#2136

PR-URL: #31395
Reviewed-By: Luigi Pinca <[email protected]>
Reviewed-By: Anna Henningsen <[email protected]>
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HarshithaKP authored and codebytere committed Feb 17, 2020
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24 changes: 24 additions & 0 deletions doc/api/process.md
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Expand Up @@ -2162,6 +2162,14 @@ a [Writable][] stream.
`process.stderr` differs from other Node.js streams in important ways. See
[note on process I/O][] for more information.

### `process.stderr.fd`

* {number}

This property refers to the value of underlying file descriptor of
`process.stderr`. The value is fixed at `2`. In [`Worker`][] threads,
this field does not exist.

## `process.stdin`

* {Stream}
Expand Down Expand Up @@ -2195,6 +2203,14 @@ In "old" streams mode the `stdin` stream is paused by default, so one
must call `process.stdin.resume()` to read from it. Note also that calling
`process.stdin.resume()` itself would switch stream to "old" mode.

### `process.stdin.fd`

* {number}

This property refers to the value of underlying file descriptor of
`process.stdin`. The value is fixed at `0`. In [`Worker`][] threads,
this field does not exist.

## `process.stdout`

* {Stream}
Expand All @@ -2213,6 +2229,14 @@ process.stdin.pipe(process.stdout);
`process.stdout` differs from other Node.js streams in important ways. See
[note on process I/O][] for more information.

### `process.stdout.fd`

* {number}

This property refers to the value of underlying file descriptor of
`process.stdout`. The value is fixed at `1`. In [`Worker`][] threads,
this field does not exist.

### A note on process I/O

`process.stdout` and `process.stderr` differ from other Node.js streams in
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