Shim for importing AngularJS services and factories into the node environment.

add.js

'use strict';

// Illustrates a simple AngularJS factory
angular.module('myApp')
  .factory('add', function () {
    // Here is our factory state
    var theCurrentValue = 0;

    return {
      // Our fancy service invocation
      run: function (val) {
        theCurrentValue += val;
        return theCurrentValue;
      }
    };
  });

angularServiceShim.js

/**
 * This module provides a shim for importing AngularJS services and factories into a node environment. Might be useful for
 * testing/instrumenting services using the rich capabilities of the Node ecosystem.
 *
 * This shim only works on AngularJS services/factories that don't have other dependencies. (Injection is not supported).
 */

var vm = require('vm');
var fs = require('fs');

// This object provides a context with an AngularJS shim
var context = {
  angular: {
    // Mimics the angular.module API
    module: function () {
      return {
        factory: function (name, f) {
          // Return the object that is created inside the factory function
          return f();
        },
        service: function (name, Constructor) {
          // Return a new object by calling the provided constructor
          return new Constructor();
        }
      }
    }
  }
};


module.exports = function (filename) {
  // Read the JS file into memory
  var script = fs.readFileSync(filename, {encoding: 'utf8'});

  // Attempt to run the JS in the provided context
  return vm.runInNewContext(script, context);
};

main.js

// This is a demo program to demonstrate the AngularJS Services shim.

var assert = require('assert');
var shim = require('./angularServiceShim');

// Import and test the multiply service
var multiply = shim('./multiply.js');
multiply.run(7);
multiply.run(3);
var result = multiply.run(2);
assert.equal(42, result, 'Multiply Failed');

// Import and test the add factory
var add = shim('./add.js');
add.run(7);
add.run(3);
result = add.run(2);
assert.equal(12, result, 'Add Failed');

multiply.js

'use strict';

// Illustrates a simple AngularJS service
angular.module('myApp')
  .service('multiply', function Multiply() {
    // Here is our factory state
    this.theCurrentValue = 1;

    // Our fancy service invocation
    this.run = function (val) {
      this.theCurrentValue *= val;
      return this.theCurrentValue;
    }
  });