ft-webplatform/aurelia_project/tasks/concat-wp.js

import gulp from 'gulp';
import concat from 'gulp-concat';
import sourcemaps from 'gulp-sourcemaps';
import rename from 'gulp-rename';
import { CLIOptions } from 'aurelia-cli';

/**
 * Builds LiveSite JS script
 * @returns
 */
function concatWpJs() {
  let environment = CLIOptions.getEnvironment();
  let finaleFile = 'web-platform-dist.js';
  let gulpSrc =  [
    'assets/js/web-platform.js',
    'assets/js/web-platform-app.js',
    'assets/js/web-platform-etf.js',
    'assets/js/web-platform-gw.js'
  ];
  if ( environment === 'dev' ) {
    return gulp.src( gulpSrc )
      .pipe( sourcemaps.init() )
      .pipe( concat( finaleFile ) )
      .pipe( sourcemaps.write( '.' ) )
      .pipe( gulp.dest( 'assets/js' ) );
  }
  if ( environment === 'stage' ) {
    return gulp.src( gulpSrc )
      .pipe( sourcemaps.init() )
      .pipe( concat( finaleFile ) )
      .pipe( sourcemaps.write( '.' ) )
      .pipe( gulp.dest( 'assets/js' ) );
  }
  if ( environment === 'prod' ) {
    return gulp.src( gulpSrc )
      .pipe( concat( finaleFile ) )
      .pipe( gulp.dest( 'assets/js' ) );
  }
}

function renameWpJs() {
  let renameJs = false;
  if (CLIOptions.hasFlag('rename')) renameJs = true;
  let srcFile = 'assets/js/web-platform-dist.js';
  let destFile = 'assets/js/web-platform.js';
  if ( renameJs === true ) {
    return gulp.src(srcFile)
      .pipe(rename(destFile))
      .pipe(gulp.dest('./'));
  }
  return gulp.src(srcFile);
}

export default gulp.series(
  concatWpJs,
  renameWpJs
);