Installing dependencies.

node_modules/hook-std/readme.md

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+# hook-std [![Build Status](https://travis-ci.org/sindresorhus/hook-std.svg?branch=master)](https://travis-ci.org/sindresorhus/hook-std)
+
+> Hook and modify stdout and stderr
+
+
+## Install
+
+```
+$ npm install hook-std
+```
+
+
+## Usage
+
+```js
+const assert = require('assert');
+const hookStd = require('hook-std');
+
+(async () => {
+	const promise = hookStd.stdout(output => {
+		promise.unhook();
+		assert.strictEqual(output.trim(), 'unicorn');
+	});
+
+	console.log('unicorn');
+	await promise;
+})();
+```
+
+You can also unhook using the second `transform` method parameter:
+
+```js
+(async () => {
+	const promise = hookStd.stdout((output, unhook) => {
+		unhook();
+		assert.strictEqual(output.trim(), 'unicorn');
+	});
+
+	console.log('unicorn');
+	await promise;
+})();
+```
+
+
+## API
+
+### hookStd([options], transform)
+
+Hook streams in [streams option](#streams), by default stdout and stderr.
+
+Returns a `Promise` with a `unhook()` method which, when called, unhooks both stdout and stderr and resolves the `Promise` with an empty result.
+
+### hookStd.stdout([options], transform)
+
+Hook stdout.
+
+Returns a `Promise` with a `unhook()` method which, when called, resolves the `Promise` with an empty result.
+
+### hookStd.stderr([options], transform)
+
+Hook stderr.
+
+Returns a `Promise` with a `unhook()` method which, when called, resolves the `Promise` with an empty result.
+
+#### options
+
+Type: `Object`
+
+##### silent
+
+Type: `boolean`<br>
+Default: `true`
+
+Suppress stdout/stderr output.
+
+##### once
+
+Type: `boolean`<br>
+Default: `false`
+
+Automatically unhooks after the first call.
+
+##### streams
+
+Type: `stream.Writable[]`<br>
+Default: `[process.stdout, process.stderr]`
+
+[Writable streams](https://nodejs.org/api/stream.html#stream_writable_streams) to hook. This can be useful for libraries allowing users to configure a Writable Stream to write to.
+
+#### transform
+
+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(...)`.
+
+
+## License
+
+MIT © [Sindre Sorhus](https://sindresorhus.com)