Gulp Watch and Nodemon conflict

Question

Short of it: started using Gulp recently (convert from Grunt), and am trying to use both Gulp's default watch task (not gulp-watch from npm) for SASS/JS/HTML and gulp-nodemon (from npm) to restart an Express server upon changes. When running just gulp watch, it works fine; and when running gulp server (for nodemon) that works fine. However, using both together (shown below in the configuration of the default task), the watch stuff isn't working. The task is running, and on the CLI gulp shows 'Starting' and 'Finished' for the watch tasks, but the files don't update.

Relevant task configurations:

Concat javascript:

    gulp.task('js:app', function(){
        return gulp.src([
            pathSource('js/application/modules/**/*.js'),
            pathSource('js/application/_main.js')
        ])
        .pipe(concat('application.js'))
        .pipe(gulp.dest('./build/assets/js')).on('error', utils.log);
    });

Nodemon, restart on changes to express app:

    gulp.task('express', function(){
        return nodemon({script:'server.js', ext:'js', cwd: __dirname + '/express', legacyWatch: true})
        .on('restart', function(){
            //gulp.run('watch'); // doesn't work :(
        });
});

Watch javascript changes, and run js:app for concat'ing.

    gulp.task('watch', function(){
      gulp.watch(pathSource('js/application/**/*.js'), ['js:app']);
    });

Default task, to initialize gulp watch and nodemon simultaneously:

    gulp.task('default', ['watch', 'express']);

If anyone has any ideas, thanks in advance!

Gaston Gaston · Accepted Answer · 2014-05-13T22:35:13

gulp.run calls have been deprecated, so I'd try a different approach. Since you're already using gulp, may I suggest giving gulp-nodemon a try?

As per gulp-nodemon documentation, you can pass it an array of tasks to execute:

UPDATE: Here's the full gulpfile.js file, together with a working sample on github.

'use strict';

// Main dependencies and plugins
var gulp = require('gulp');
var jshint = require('gulp-jshint');
var concat = require('gulp-concat');
var uglify = require('gulp-uglify');
var rename = require('gulp-rename');
var nodemon = require('gulp-nodemon');

var assets = 'assets/js/**/*.js';
var publicDir = 'public/javascripts';

// Lint Task
gulp.task('lint', function () {
  return gulp.src(assets)
    .pipe(jshint())
    .pipe(jshint.reporter('jshint-stylish'));
});

// Concatenate and minify all JS files
gulp.task('scripts', function () {
  return gulp.src(assets)
    .pipe(concat('global.js'))
    .pipe(gulp.dest(publicDir))
    .pipe(rename('global.min.js'))
    .pipe(uglify())
    .pipe(gulp.dest(publicDir));
});

// Watch Files For Changes
gulp.task('watch', function () {
  gulp.watch(assets, ['lint', 'scripts']);
});

gulp.task('demon', function () {
  nodemon({
    script: 'server.js',
    ext: 'js',
    env: {
      'NODE_ENV': 'development'
    }
  })
    .on('start', ['watch'])
    .on('change', ['watch'])
    .on('restart', function () {
      console.log('restarted!');
    });
});

// Default Task
gulp.task('default', ['demon']);

This way, you spawn the watch task upon nodemon's start and ensure that the watch task is again triggered whenever nodemon restarts your app.

EDIT: ~~seems you should be calling the on-change event from gulp-nodemon, which will handle compile tasks before the restart event triggers.~~

EDIT: It seems nodemon's on('change', callback) is removed from their API

Gulp Watch and Nodemon conflict

2 Answers