title: Removing gulp.src files after gulp.dest?
body: <p>I have a scenario where a client of mine wants to drop LESS files into a <code>src</code> directory (via FTP), and for them to be automatically outputted as CSS to a <code>build</code> directory. For each LESS file, once its resultant CSS file is created, it should be removed from the <code>src</code> directory. How can I do this with Gulp?</p>
  
  <p>My current <code>gulpfile.js</code> is:</p>
  
  <pre><code>var gulp = require("gulp");
  var watch = require("gulp-watch");
  var less = require("gulp-less");
  
  watch({ glob: "./src/**/*.less" })
    .pipe(less())
    .pipe(gulp.dest("./build"));
  </code></pre>
  
  <p>This successfully detects new LESS files being dropped into the <code>src</code> directory and outputs CSS files into <code>build</code>. But it doesn't clean up the LESS files afterwards. :(</p>