In the root of your ionic app, there is a gulpfile.js file. Open it in an editor and paste the following gulp task:

gulp.task('lint', function() {
    return gulp.src(['./www/js/**/*.js']) 
        .pipe(jshint('.jshintrc'))
        .pipe(jshint.reporter('jshint-stylish')) 
        .pipe(jshint.reporter('fail'))
});

This looks for a folder called 'js' inside the 'www' folder. If you have other folders containing JavaScript files, add those too. For example, lets also add a folder called 'views':

gulp.task('lint', function() {
    return gulp.src(['./www/js/**/*.js','./www/views/**/*.js'])
        .pipe(jshint('.jshintrc'))
        .pipe(jshint.reporter('jshint-stylish')) 
        .pipe(jshint.reporter('fail'))
});

Explanations:

1) /**/*.js - This syntax means to look at all the js files in the subfolders too
2) .jshintrc - This is a configuration file that we will create in the next example. 

Create a file named '.jshintrc' in the root of your app, where package.json is.

*Note on windows: create a file named "jshintrc.txt". Then rename it to ".jshintrc." (notice the dot at the end).

This is a configuration file. It can for example tell jshint to ignore certain variables and many other things. Here is mine:

{
    "predef": [ 
        "window",
        "console",
        "cordova",
        "device",
        "alert",
        "document",
        "debug",
        "setServiceVars",
        "StatusBar",
        "config"
    ],
    "globals": {
        "angular"        : false,
        "myApp"            : false,
        "myControllers"    : false,
        "myDirectives"    : false,
        "localStorage"     : false,
        "navigator"         : false, 
        "emit"             : false, 
        "atob"             : false,  
        "moment"        : false,
        "btoa"            : false
    },
    "node"          : true
}

1. Create a file named: "Makefile" (with no extension) in the root of your app

2. Open it in a text editor and add this:

android:
    gulp lint
    gulp sass
    ionic run android --device

ios:
    gulp lint
    gulp sass
    ionic build ios

This will lint your app and if that passes, it will compile sass and build you app.

Usage: To run your app, instead of the regular "ionic run android --device", run these commands:

Android: make android
iOS    : make ios