How to use the child_process.ChildProcess function in child_process

const child = new ChildProcess();

  [null, 0, 1, NaN, true, false, {}, 'foo'].forEach((args) => {
    common.expectsError(() => {
      child.spawn({ file: 'foo', args });
    }, {
      code: 'ERR_INVALID_ARG_TYPE',
      type: TypeError,
      message: 'The "options.args" property must be of type Array. ' +
               `Received type ${typeName(args)}`
    });
  });
}

// Test that we can call spawn
const child = new ChildProcess();
child.spawn({
  file: process.execPath,
  args: ['--interactive'],
  cwd: process.cwd(),
  stdio: 'pipe'
});

assert.strictEqual(child.hasOwnProperty('pid'), true);
assert(Number.isInteger(child.pid));

// Try killing with invalid signal
common.expectsError(
  () => { child.kill('foo'); },
  { code: 'ERR_UNKNOWN_SIGNAL', type: TypeError }
);

'use strict';

const common = require('../common');
const assert = require('assert');
const { ChildProcess } = require('child_process');
assert.strictEqual(typeof ChildProcess, 'function');

function typeName(value) {
  return typeof value;
}

{
  // Verify that invalid options to spawn() throw.
  const child = new ChildProcess();

  [undefined, null, 'foo', 0, 1, NaN, true, false].forEach((options) => {
    common.expectsError(() => {
      child.spawn(options);
    }, {
      code: 'ERR_INVALID_ARG_TYPE',
      type: TypeError,
      message: 'The "options" argument must be of type Object. ' +
               `Received type ${typeName(options)}`
    });
  });
}

{
  // Verify that spawn throws if file is not a string.
  const child = new ChildProcess();

const execa = (file, args, options) => {
	const parsed = handleArgs(file, args, options);
	const command = joinCommand(file, args);

	let spawned;
	try {
		spawned = childProcess.spawn(parsed.file, parsed.args, parsed.options);
	} catch (error) {
		// Ensure the returned error is always both a promise and a child process
		const dummySpawned = new childProcess.ChildProcess();
		const errorPromise = Promise.reject(makeError({
			error,
			stdout: '',
			stderr: '',
			all: '',
			command,
			parsed,
			timedOut: false,
			isCanceled: false,
			killed: false
		}));
		return mergePromise(dummySpawned, errorPromise);
	}

	const spawnedPromise = getSpawnedPromise(spawned);
	const timedPromise = setupTimeout(spawned, parsed.options, spawnedPromise);

const execa = (file, args, options) => {
	const parsed = handleArgs(file, args, options);
	const command = joinCommand(file, args);

	let spawned;
	try {
		spawned = childProcess.spawn(parsed.file, parsed.args, parsed.options);
	} catch (error) {
		// Ensure the returned error is always both a promise and a child process
		const dummySpawned = new childProcess.ChildProcess();
		const errorPromise = Promise.reject(makeError({
			error,
			stdout: '',
			stderr: '',
			all: '',
			command,
			parsed,
			timedOut: false,
			isCanceled: false,
			killed: false
		}));
		return mergePromise(dummySpawned, errorPromise);
	}

	const spawnedPromise = getSpawnedPromise(spawned);
	const timedPromise = setupTimeout(spawned, parsed.options, spawnedPromise);

beforeEach(function() {
      sandbox = sinon.createSandbox();
      child = new ChildProcess();

      child.stdout = new Emitter();
      child.stderr = new Emitter();

      compile = sandbox.stub(ConsoleAgent.prototype, 'compile').returns(
        Promise.resolve(child)
      );
      sandbox.stub(ConsoleAgent.prototype, 'createChildProcess').returns(
        Promise.resolve(child)
      );
      sandbox.stub(fs, 'writeFile').returns(
        Promise.resolve(child)
      );
      sandbox.stub(fs, 'stat').returns(true);
    });