gulpfile.js
function transpile() {
  return exec('node_modules/.bin/ngc -p tsconfig.json', function (err, stdout, stderr) {
    console.log(stdout);
    console.log(stderr);
    if (err !== null) {
      process.exit(1);
    }
  });
}
function transpile() {
  return exec('node_modules/.bin/ngc -p tsconfig.json', function (err, stdout, stderr) {
    console.log(stdout);
    console.log(stderr);
    if (err !== null) {
      process.exit(1);
    }
  });
}
function transpile ( ) { return exec ( 'node_modules/.bin/ngc -p tsconfig.json' , function ( err , stdout , stderr ) { console . log ( stdout ) ; console . log ( stderr ) ; if ( err !== null ) { process . exit ( 1 ) ; } } ) ; }
Build the components 
Since the gulpngc is no longer being supported we need to us ngc

@returns {ChildProcess}
Build the components Since the gulpngc is no longer being supported we need to us ngc