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Showing content from https://github.com/sindresorhus/hook-std below:

sindresorhus/hook-std: Hook and modify stdout and stderr

Hook and modify stdout and stderr

import assert from 'node:assert';
import {hookStdout} from 'hook-std';

const promise = hookStdout(output => {
	promise.unhook();
	assert.strictEqual(output.trim(), 'unicorn');
});

console.log('unicorn');
await promise;

You can also unhook using the second transform method parameter:

import assert from 'node:assert';
import {hookStdout} from 'hook-std';

const promise = hookStdout((output, unhook) => {
	unhook();
	assert.strictEqual(output.trim(), 'unicorn');
});

console.log('unicorn');
await promise;

Hook streams in streams option, or stdout and stderr if none are specified.

Returns a Promise with a unhook() method which, when called, unhooks both stdout and stderr and resolves the Promise with an empty result.

Hook stdout.

Returns a Promise with a unhook() method which, when called, unhooks stdout and resolves the Promise with an empty result.

Hook stderr.

Returns a Promise with a unhook() method which, when called, unhooks stderr and resolves the Promise with an empty result.

Type: object

Type: boolean
Default: true

Suppress stdout/stderr output.

Type: boolean
Default: false

Automatically unhook after the first call.

Type: stream.Writable[]
Default: [process.stdout, process.stderr]

The writable streams to hook. This can be useful for libraries allowing users to configure a writable stream to write to.

Type: Function

Receives stdout/stderr as the first argument and the unhook method as the second argument. Return a string to modify it. Optionally, when in silent mode, you may return a boolean to influence the return value of .write(…).

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