property ChildProcess.prototype.stdio
Usage in Deno
```typescript import { ChildProcess } from "node:node__child_process.d.ts"; ```A sparse array of pipes to the child process, corresponding with positions in
the `stdio` option passed to [spawn](../.././node__child_process.d.ts/~/spawn) that have been set
to the value `'pipe'`. `subprocess.stdio[0]`, `subprocess.stdio[1]`, and `subprocess.stdio[2]` are also available as `subprocess.stdin`, `subprocess.stdout`, and `subprocess.stderr`,
respectively.
In the following example, only the child's fd `1` (stdout) is configured as a
pipe, so only the parent's `subprocess.stdio[1]` is a stream, all other values
in the array are `null`.
```js
import assert from 'node:assert';
import fs from 'node:fs';
import child_process from 'node:child_process';
const subprocess = child_process.spawn('ls', {
stdio: [
0, // Use parent's stdin for child.
'pipe', // Pipe child's stdout to parent.
fs.openSync('err.out', 'w'), // Direct child's stderr to a file.
],
});
assert.strictEqual(subprocess.stdio[0], null);
assert.strictEqual(subprocess.stdio[0], subprocess.stdin);
assert(subprocess.stdout);
assert.strictEqual(subprocess.stdio[1], subprocess.stdout);
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.