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doc: clarify subprocess.stdout/in/err/io properties #36784

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doc: clarify subprocess.stdout/in/err/io properties #36784

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12 changes: 12 additions & 0 deletions doc/api/child_process.md
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Original file line number Diff line number Diff line change
Expand Up @@ -1508,6 +1508,9 @@ then this will be `null`.
`subprocess.stderr` is an alias for `subprocess.stdio[2]`. Both properties will
refer to the same value.

The `subprocess.stderr` property can be `null` if the child process could
not be successfully spawned.

### `subprocess.stdin`
<!-- YAML
added: v0.1.90
Expand All @@ -1526,6 +1529,9 @@ then this will be `null`.
`subprocess.stdin` is an alias for `subprocess.stdio[0]`. Both properties will
refer to the same value.

The `subprocess.stdin` property can be `undefined` if the child process could
not be successfully spawned.

### `subprocess.stdio`
<!-- YAML
added: v0.7.10
Expand Down Expand Up @@ -1566,6 +1572,9 @@ assert.strictEqual(subprocess.stdio[2], null);
assert.strictEqual(subprocess.stdio[2], subprocess.stderr);
```

The `subprocess.stdio` property can be `undefined` if the child process could
not be successfully spawned.

### `subprocess.stdout`
<!-- YAML
added: v0.1.90
Expand All @@ -1591,6 +1600,9 @@ subprocess.stdout.on('data', (data) => {
});
```

The `subprocess.stdout` property can be `null` if the child process could
not be successfully spawned.

### `subprocess.unref()`
<!-- YAML
added: v0.7.10
Expand Down