タスクランナーの連続実行を抑止する: gulp.js, Grunt ref: http://qiita.com/cognitom/items/c6d821d72664f90f1e11

file0.txt

var gulp = require("gulp");

gulp.task('watch', function(){
  gulp.watch('coffee/*.coffee', ['coffee']);
});

file1.txt

var gulp = require("gulp");

gulp.task('watch', function(){
  var gaze_opt = {
    debounceDelay: 10000 // wait 10 sec after the last run
  };
  gulp.watch('coffee/*.coffee', gaze_opt, ['coffee']);
});

file2.txt

watch: {
  scripts: {
    files: 'coffee/*.coffee',
    tasks: ['coffee'],
    options: {
      debounceDelay: 10000, // wait 10 sec after the last run
    },
  },
},