Quick node script to build multiple angular libraries (zero deps, tested on node 8 LTS)

build_all_libraries.js

const { spawn } = require('child_process');

const fileName = './angular.json';
let file;

try {
  file = require(fileName);
} catch(e) {
  console.error(e);
  process.exit(1);
}

if(!file.projects) {
  console.error('No projects found in angular.json file');
  process.exit(1);
}

const libraries = Object.keys(file.projects).filter((name) => file.projects[name].projectType == "library");

if(!libraries || libraries.length == 0) {
  console.warn('No libraries found in current angular project, nothing to build');
  // throw exit code 0 cause technically everything that "should" be built was...
  process.exit(0);
}

async function buildLibrary(name) {
  const build = spawn('npx', ['ng', 'build', name]);
  build.stdout.on('data', data => console.log(data.toString()));
  build.stdout.on('end', _ => console.log(`Finished building ${name} library`));
  build.on('exit', code => {
    if(code != 0) {
      throw `Failed to build library ${name}`;
    }
    return;
  })
}

async function buildAllLibraries(libraries) {
  for(let i = 0; i < libraries.length; i++) {
    await buildLibrary(libraries[i]);
  }
}

try {
  buildAllLibraries(libraries);
} catch(e) {
  console.error(e);
  process.exit(1);
}