How to use the @angular/compiler-cli/src/main.main function in @angular/compiler-cli

gulp.task('ngc', function () {
  return ngc({
    project: `${tmpFolder}/tsconfig.es5.json`
  })
    .then((exitCode) => {
      if (exitCode === 1) {
        // This error is caught in the 'compile' task by the runSequence method callback
        // so that when ngc fails to compile, the whole compile process stops running
        throw new Error('ngc compilation failed');
      }
    });
});

gulp.task('ngc', function () {
  return ngc({
    project: `${tmpFolder}/tsconfig.es5.json`
  })
    .then((exitCode) => {
      if (exitCode === 1) {
        // This error is caught in the 'compile' task by the runSequence method callback
        // so that when ngc fails to compile, the whole compile process stops running
        throw new Error('ngc compilation failed');
      }
    });
});

gulp.task('ngc', function () {
  return ngc({
    project: `${tmpFolder}/tsconfig.es5.json`
  })
    .then((exitCode) => {
      if (exitCode === 1) {
        // This error is caught in the 'compile' task by the runSequence method callback
        // so that when ngc fails to compile, the whole compile process stops running
        throw new Error('ngc compilation failed');
      }
    });
});

const ngc = (args) => new Promise((resolve, reject) => {// Promisify version of the ngc compiler
  let exitCode = require('@angular/compiler-cli/src/main').main(args);
  resolve(exitCode);
});
const rollup = require('rollup');

const ngc = (args) => new Promise((resolve, reject) => { // Promisify version of the ngc compiler
		let exitCode = require('@angular/compiler-cli/src/main').main(args);
		resolve(exitCode);
	});

gulp.task('ngc', function () {
  return ngc({
    project: `${tmpFolder}/tsconfig.json`
  })
    .then((exitCode) => {
      if (exitCode === 1) {
        // This error is caught in the 'compile' task by the runSequence method callback
        // so that when ngc fails to compile, the whole compile process stops running
        throw new Error('ngc compilation failed');
      }
    });
});

const ngc = (args) => new Promise((resolve, reject)=>{// Promisify version of the ngc compiler
  let exitCode = require('@angular/compiler-cli/src/main').main(args);
  resolve(exitCode);
});
const rollup = require('rollup');

const ngc = (args) => new Promise((resolve, reject) => {// Promisify version of the ngc compiler
  let exitCode = require('@angular/compiler-cli/src/main').main(args);
  resolve(exitCode);
});
const rollup = require('rollup');

  .then(() => ngc({ project: `${tempLibFolder}/tsconfig.es5.json` })
    .then(exitCode => exitCode === 0 ? Promise.resolve() : Promise.reject())
    .then(() => console.log('ES5 compilation succeeded.'))
  )

    .then(() => ngc({ project: `${buildFolder}/tsconfig.lib.json` })
      .then(exitCode => exitCode === 0 ? Promise.resolve() : Promise.reject())
      .then(() => gulpUtil.log('ES2015 compilation succeeded.'))
    )