property ChildProcess.prototype.stdio
Usage in Deno
import { ChildProcess } from "node:child_process";
A sparse array of pipes to the child process, corresponding with positions in
the stdio option passed to 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.
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.