execute `npm` within a Docker container, within the host's working directory

docker-npm.js

// ideal for use with AWS Lambda and native Node.js modules

// requires Docker: https://docs.docker.com/engine/installation/

/*
Usage:
  node docker-npm.js install
  node docker-npm.js rebuild
*/

const childProcess = require('child_process');

const nodejsImage = 'node:8.10';
const innerWorkingDir = '/src';
const dockerArgs = [
  'run', '-i',
  '-v', `${process.cwd()}:${innerWorkingDir}`,
  '-w', innerWorkingDir,
  nodejsImage, 'npm',
];

const npmArgs = process.argv.slice(2);

const cp = childProcess.execFile(
  'docker',
  dockerArgs.concat(npmArgs),
  {},
  () => {},
);

cp.stderr.on('data', data => console.error(data));
cp.stdout.on('data', data => console.log(data));

cp.on('close', code => process.exit(code));