var gulp = require('gulp');
var browserify = require('browserify');
var source = require('vinyl-source-stream');

gulp.task('browserify', function(){
  browserify({entries: ['src/app.js']})
  .bundle()
  .pipe(source('bundle.js'))
  .pipe(gulp.dest('./js'))
});

gulp.task('default', function() {
  gulp.watch('src/app.js', ['browserify']);
});

Cannot find module '~/testproj/src/app.js' from '~/testproj'