zengenti-buildstartup-package/lib/start/launcher.js

Post-build scripts to generate the startup scripts for any configured environments

var fs = require("fs");
var minimist = require("minimist");
var buildStartupRuntime = require("./startup.utils").buildStartupRuntime;

var argv = minimist(process.argv.slice(2));

var alias =
  process.env.npm_config_alias || argv.alias || process.env.alias;
var projectId =
  process.env.npm_config_projectId || argv.projectId || process.env.projectId;
var accessToken = process.env.npm_config_accessToken || argv.accessToken || process.env.accessToken;

var startFileName = `./start.${projectId}.${alias}.js`.toLowerCase();
var startScriptPath = `dist/server/${startFileName}`;

// try to launch application with targeted start script
try {
  if (!alias && !projectId)
    throw new Error(`--alias is ${alias}, --projectId is ${projectId}`);

  // To avoid an annoying bug with require caching
  // a MODULE_NOT_FOUND error we will check if the script
  // exists before require-ing it.
  console.log(
    `[launcher] startup file: ${startFileName} - exists?: ${fs.existsSync(
      startScriptPath
    )}`
  );
  if (!fs.existsSync(startScriptPath)) {
    // If the script does not exist we will generate one
    console.log(
      `[launcher runtime] Generating start scripts for '${projectId}' on '${alias}'`
    );
    buildStartupRuntime({
      alias,
      projectId,
      accessToken,
    });
  }
  try {
    // Require the targeted start script to launch the app
    require(`./${startFileName}`);
  } catch (startException) {
    // Failed to start with a targeted start script
    console.error("[launcher start server]", startException);
  }
} catch (buildStartupException) {
  // Failed to generate runtime start script
  console.error("[launcher generate script]", buildStartupException);
}