Outputted bundle is not correct. Example case inside:

[JSMan2000]

Expected Result

1. A valid bundle is included and all modules can be found via require()

Actual result

The bundle fails to require the "bluebird" module with the following error:

Uncaught Error: Cannot find module 'bluebird'

You can see in the reproduction code that bluebird does in fact exist. It is defined in main2.js/bundle2.js. As a result, it should be found, but it fails to be found.

Reproduction Code

Include bundle1.js and bundle2.js into a file and then call the functions:

window.main1();
window.main2();

You will receive the error that bluebird cannot be found even though it is clearly defined in main2/bundle2

It is the main1() function that fails to find the module.

Grunt file

module.exports = function(grunt) {
    grunt.initConfig({
        browserify: {
            main1: {
                src: ['src/main1.js'],
                dest: 'build/bundle1.js',
                options: {
                    external: ['bluebird']
                },
            },

            main2: {
                src: ['src/main2.js'],
                dest: 'build/bundle2.js',
            }
        }
    });

    grunt.loadNpmTasks('grunt-browserify');
    grunt.registerTask('default', ['browserify']);

};

Main1.js

window.main1 = function() {
    let pexec = require('pexec');
    console.log(pexec);
}

Main2.js

window.main2 = function() {
    let t = require('bluebird');
    console.log(t);
};