Grunt Watch not creating files on save - gruntjs

Question

The tasks in my grunt file are running without errors but the files i'm asking it to create aren't being compiled. They are created if I simple run 'grunt' but if I use 'grunt watch' and save a file it doesn't update.
Particularly I am working on file 'script/src/latestNews.js' so on save this should concat with others to create 'script/dist/main.js', which it does. But it does not then go on to create 'dist/build.min.js' like it should.
module.exports = function (grunt) {
// Project configuration.
grunt.initConfig({
pkg: grunt.file.readJSON('package.json'),
uglify: {
options: {
mangle: false
},
target: {
files: {
'script/dist/main.min.js':'script/dist/main.js'
}
},
build: {
files: {
'script/dist/build.min.js':'script/dist/build.min.js'
}
}
},
concat: {
options: {
stripBanners: true,
banner: '/*! <%= pkg.name %> - v<%= pkg.version %> - ' +
'<%= grunt.template.today("yyyy-mm-dd") %> */',
},
srcJS: {
src: ['script/src/menu.js',
'script/src/custom_plugins.js',
'script/src/banner.js',
'script/src/latestNews.js',
'script/src/officers.js',
'script/src/eventsCalendar.js',
'script/src/combinedSocialMedia.js',
'script/src/haveYourSay.js',
'script/src/photoGallery.js',
'script/src/countdown.js'
],
dest: 'script/dist/main.js'
},
css: {
src: ['style/libs/bootstrap.min.css',
'style/libs/bootstrap-theme.min.css',
'style/src/css/*'],
dest: 'style/dist/build.min.css'
},
build: {
src: ['script/libs/jquery.easing.min.js',
'script/dist/main.js',
'script/libs/bootstrap.min.js',
'script/libs/velocity.min.js',
'script/libs/date.js',
'script/libs/jquery.timeago.js',
'script/libs/owl.carousel.min.js'
],
dest: 'script/dist/build.min.js'
}
},
jshint: {
main: 'script/dist/main.js'
},
watch: {
js: {
files: 'script/src/*',
tasks: ['concat:srcJS', 'uglify:target', 'jshint:main', 'copy:js']
},
css: {
files: 'style/src/css/*',
tasks: ['copy:css']
},
less: {
files: 'style/src/less/*',
tasks: ['less', 'copy:css']
},
html: {
files: '*.html',
tasks: ['validation', 'bootlint']
}
},
clean: {
js: [
'script/dist/main.min.js',
'dist/build.min.js',
'dist/build.min.css'
]
},
copy: {
css: {
files: [
{ expand: true, 'src' : 'style/src/css/main.css',
'dest' : 'style/dist/', flatten: true,
rename: function(dest, src) {
return dest + src.replace('main','build.min');
}
},
{ expand: true, 'src' : 'style/dist/build.min.css',
'dest' : 'dist/', flatten: true },
]
},
js: {
files: [
{ expand: true, 'src' : 'script/dist/build.min.js',
'dest' : 'dist/', flatten: true }
]
}
},
validation: {
options: {
reset: grunt.option('reset') || false,
stoponerror: true,
relaxerror: ['Bad value X-UA-Compatible for attribute http-equiv on element meta.'] //ignores these errors
},
files: {
src: ['homepage.html']
}
},
bootlint: {
options: {
stoponerror: false,
relaxerror: ['E001', 'E003', 'E031', 'W001', 'W002', 'W003', 'W005', 'W007', 'W009', 'E013']
},
files: ['homepage.html'],
},
less: {
build: {
options: {
paths: ["style/src/less"],
cleancss: true,
compress: true
},
files: {
"style/src/css/main.css": "style/src/less/main.less"
}
}
}
});
// Load the plugin that provides the "uglify" task.
grunt.loadNpmTasks('grunt-contrib-concat');
grunt.loadNpmTasks('grunt-contrib-uglify');
grunt.loadNpmTasks('grunt-contrib-jshint');
grunt.loadNpmTasks('grunt-contrib-watch');
grunt.loadNpmTasks('grunt-contrib-copy');
grunt.loadNpmTasks('grunt-contrib-clean');
grunt.loadNpmTasks('grunt-contrib-less');
grunt.loadNpmTasks('grunt-html-validation');
grunt.loadNpmTasks('grunt-bootlint');
// Default task(s).
//grunt.registerTask('default', ['concat:srcJS','concat:css','uglify','jshint:main']);
grunt.registerTask('default', [
'validation',
'bootlint',
'concat:srcJS',
'jshint:main',
'uglify:target',
'clean',
'concat:build',
'uglify:build',
'less',
'copy'
]);
};

Answer 1

It looks like the array of tasks that are run by your watch:js task is simply missing a couple of critical tasks. Specifically you are not running the concat:build and uglify:build tasks.
Your current array of tasks:
['concat:srcJS', 'uglify:target', 'jshint:main', 'copy:js']
Complete/fixed array of tasks:
['concat:srcJS', 'uglify:target', 'jshint:main', 'concat:build', 'uglify:build', 'copy:js']
Replacing your current array with the fix that I supplied should solve your issue.