title: Gulp execution time gets increased with every run - due to memory stacking
body: <p>I have a issue due to probably improper gulpfile.js configuration.
  When i'm starting gulp, everything is working great but with every run
  tasks execution time gets increased. </p>
  
  <p>I'm using :</p>
  
  <ul>
  <li>clean-css,</li>
  <li>sass</li>
  <li>watch</li>
  <li>sourcemaps</li>
  </ul>
  
  <p>My gulpfile.js configuration : </p>
  
  <pre><code>let gulp        = require('gulp'),
      cleanCSS    = require('gulp-clean-css'),
      sass        = require('gulp-sass'),
      watch       = require('gulp-watch'),
  
      sourcemaps  = require('gulp-sourcemaps'),
      rename      = require('gulp-rename');
  
  let browserSync = require('browser-sync').create();
  
  // browserSync and files watcher
  gulp.task('sync', () =&gt; {
  
      browserSync.init({
          proxy: environmentPath
      });
  
      gulp.watch(sassWatcher, gulp.series('sass'));
      gulp.watch(jsWatcher).on('change', browserSync.reload);    
      gulp.watch(htmlWatcher).on('change', browserSync.reload);
  });
  
  // development sass output, with browserSync and sourcemaps
  gulp.task('sass', () =&gt; {
      return gulp.src(sassDevFile)
          .pipe(sourcemaps.init({loadMaps: true}))
          .pipe(sass().on('error', sass.logError))
  
          .pipe(sourcemaps.write())
          .pipe(gulp.dest(sassOutputFolder))
          .pipe(browserSync.stream())
  });
  </code></pre>
  
  <p><strong>After few executions of task i get this error :</strong></p>
  
  <pre><code>[15:48:19] Finished 'sass' after 3.65 s
  
  &lt;--- Last few GCs ---&gt;
  
  [17940:00000161B594A100]  1604145 ms: Scavenge 52.8 (61.2) -&gt; 52.0 (62.2) MB, 2.7 / 0.0 ms  (average mu = 0.997, current mu = 0.978) allocation failure
  [17940:00000161B594A100]  1604176 ms: Scavenge 53.4 (62.2) -&gt; 52.7 (62.7) MB, 21.7 / 0.0 ms  (average mu = 0.997, current mu = 0.978) allocation failure
  [17940:00000161B594A100]  1604223 ms: Scavenge 54.0 (62.7) -&gt; 53.3 (63.2) MB, 29.8 / 0.0 ms  (average mu = 0.997, current mu = 0.978) allocation failure
  
  
  &lt;--- JS stacktrace ---&gt;
  Cannot get stack trace in GC.
  FATAL ERROR: NewSpace::Rebalance Allocation failed - JavaScript heap out of memory
   1: 00007FF6188E0EFA
   2: 00007FF6188BA296
   3: 00007FF6188BAC80
  </code></pre>
  
  <p>Is there any way to disable this memory stacking?</p>