TypeScript编译安装

npm install -g typescript
npm install  gulp-typescript -D

// gulpfile.js
var ts = require('gulp-typescript');

gulp.task('watch', function () {
  //sass监听
  gulp.watch('src/css/sass/*.scss', function () {
    return gulp
      .src('src/css/sass/*.scss')
      .pipe(sass())
      .pipe(gulp.dest('dist/css'));
  });
  //less监听
  gulp.watch('src/css/less/*.less', function () {
    return gulp
      .src('src/css/less/*.less')
      .pipe(less())
      .pipe(gulp.dest('dist/css/'));
  });
  // Typescript
  gulp.watch('src/js/ts/*.ts', function () {
    return gulp.src('src/js/ts/*.ts').pipe(ts()).pipe(gulp.dest('dist/js/'));
  });
});