set-dev-version.js

#!/usr/bin/env node
/**
 * Sets a a nice build number when building nightly builds
 * (eg. "0.16.0-20161019.1800")
 */

const fs = require('fs');

function leftPad(value) {
  return (value < 10 ? '0' : '') + value;
}

const packageManifestFilename = __dirname + '/../package.json'
const packageManifest = require(packageManifestFilename);
const date = new Date();
const formattedDate =
  date.getUTCFullYear() + leftPad(date.getUTCMonth() + 1) + leftPad(date.getUTCDate()) + '.' +
  leftPad(date.getUTCHours()) + leftPad(date.getUTCMinutes());

// Remove any existing suffix before appending the date
const version = packageManifest.version.replace(/\-(.+)$/, '') + '-' + formattedDate;

packageManifest.version = version;
fs.writeFileSync(packageManifestFilename, JSON.stringify(packageManifest, null, 2) + "\n");
console.log('Updated version number to ' + version);