Using Grunt Assemble in Gulp

Gruntfile.js

module.exports = function(grunt) {
  grunt.initConfig({
    assemble: {
      options: {
        partials: ['./app/templates/partials/**/*.hbs'],
        layout: ['./app/templates/layouts/default.hbs'],
        data: ['./app/data/*.json'],
        helpers: ['./build-pipeline/_helpers/helper-*.js']
      },
      site: {
        files: [
          {
            expand: true,
            cwd: "./app/templates/pages/",
            src: "**/*.hbs",
            dest: "app/compiled/",
            ext: ".html"
          }
        ]
      }
    }
  });
  grunt.loadNpmTasks("assemble");
  return grunt.registerTask('grunt-assemble', ['assemble']);
};

gulpfile.js

var gulp = require('gulp');
var assemble = require('gulp-assemble');
var browserSync = require('browser-sync');

require('gulp-grunt')(gulp);

// Static server
gulp.task('browser-sync', function() {
  browserSync({
    server: {
      baseDir: "./app/"
    }
  });
});

gulp.task('assemble-watch', ['grunt-assemble'], function() {
  gulp.watch("app/templates/**/*.hbs", ['grunt-assemble', browserSync.reload]);
});

gulp.task('watch', ['assemble-watch', 'browser-sync']);