How to use the aurelia-cli.build.bundle function in aurelia-cli

export default function processMarkup() {
  return gulp.src(project.markupProcessor.source, {sourcemaps: true, since: gulp.lastRun(processMarkup)})
      .pipe(plumber({errorHandler: notify.onError('Error: <%= error.message %>')}))
      .pipe(htmlmin({
          removeComments: true,
          collapseWhitespace: true,
          minifyCSS: true,
          minifyJS: true,
          ignoreCustomFragments: [/\${.*?}/g] // ignore interpolation expressions
      }))
      .pipe(build.bundle());
}

function buildJavaScript() {
  let transpile = babel(project.transpiler.options);
  if (useCache) {
    // the cache directory is "gulp-cache/projName-env" inside folder require('os').tmpdir()
    // use command 'au clear-cache' to purge all caches
    transpile = cache(transpile, {name: project.name + '-' + env});
  }

  return gulp.src(project.transpiler.source, {sourcemaps: true, since: gulp.lastRun(buildJavaScript)})
    .pipe(plumber({errorHandler: notify.onError('Error: <%= error.message %>')}))
    .pipe(transpile)
    .pipe(build.bundle());
}

if(!typescriptCompiler) {
    typescriptCompiler = ts.createProject('tsconfig.json', {
      "typescript": require('typescript')
    });
  }

  let dts = gulp.src(project.transpiler.dtsSource);

  let src = gulp.src(project.transpiler.source)
    .pipe(changedInPlace({firstPass: true}));

  return eventStream.merge(dts, src)
    .pipe(plumber({ errorHandler: notify.onError('Error: <%= error.message %>') }))
    .pipe(sourcemaps.init())
    .pipe(ts(typescriptCompiler))
    .pipe(build.bundle());
}

function buildTypeScript() {
  typescriptCompiler = ts.createProject('tsconfig.json', {
    typescript: require('typescript')
  });

  let dts = gulp.src(project.transpiler.dtsSource);

  let src = gulp.src(project.transpiler.source)
    .pipe(changedInPlace({firstPass: true}));

  return eventStream.merge(dts, src)
    .pipe(plumber({ errorHandler: notify.onError('Error: <%= error.message %>') }))
    .pipe(sourcemaps.init())
    .pipe(typescriptCompiler())
    .pipe(sourcemaps.write({ sourceRoot: 'src' }))
    .pipe(build.bundle());
}

function buildTypeScript() {
  typescriptCompiler = ts.createProject('tsconfig.json', {
    typescript: require('typescript')
  });

  let dts = gulp.src(project.transpiler.dtsSource);

  let src = gulp.src(project.transpiler.source)
    .pipe(changedInPlace({firstPass: true}));

  return merge2(dts, src)
    .pipe(plumber({ errorHandler: notify.onError('Error: <%= error.message %>') }))
    .pipe(sourcemaps.init())
    .pipe(typescriptCompiler())
    .pipe(sourcemaps.write({ sourceRoot: 'src' }))
    .pipe(build.bundle());
}

export default function processMarkup() {
  return gulp.src(project.markupProcessor.source, {sourcemaps: true, since: gulp.lastRun(processMarkup)})
    .pipe(build.bundle());
}

export default function processMarkup() {
  return gulp.src(project.markupProcessor.source)
    .pipe(changedInPlace({firstPass:true}))
    .pipe(htmlmin({
        removeComments: true,
        collapseWhitespace: true,
        minifyCSS: true,
        minifyJS: true
    }))
    .pipe(build.bundle());
}

export default function processCSS() {
  return gulp.src(project.cssProcessor.source)
    .pipe(changedInPlace({firstPass:true}))
    .pipe(build.bundle());
};

export default function processMarkup() {
  return gulp.src(project.markupProcessor.source)
    .pipe(changedInPlace({firstPass:true}))
    .pipe(htmlmin({
        removeComments: true,
        collapseWhitespace: true,
        minifyCSS: true,
        minifyJS: true
    }))
    .pipe(build.bundle());
}

export default function processMarkup() {
  return gulp.src(project.markupProcessor.source)
    .pipe(changedInPlace({firstPass:true}))
    .pipe(htmlmin({
        removeComments: true,
        collapseWhitespace: true,
        collapseInlineTagWhitespace: true,
        collapseBooleanAttributes: true,
        removeAttributeQuotes: true,
        minifyCSS: true,
        minifyJS: true,
        removeScriptTypeAttributes: true,
        removeStyleLinkTypeAttributes: true
    }))
    .pipe(build.bundle());
}