fix(bundler): don't trace dependencies which have no main file

closes #435 (comment)

lib/build/dependency-inclusion.js

@@ -8,7 +8,10 @@ exports.DependencyInclusion = class {
     this.description = description;
     this.items = [];
     this.traceDependencies = true;
-    bundle.bundler.addFile(new DependencyFile(bundle, description), this);
+
+    if (description.loaderConfig.main !== false) {
+      bundle.bundler.addFile(new DependencyFile(bundle, description), this);
+    }
   }
 
   traceResources() {

spec/lib/build/bundle.spec.js

@@ -3,6 +3,7 @@
 const BundlerMock = require('../../mocks/bundler');
 const Bundle = require('../../../lib/build/bundle').Bundle;
 const CLIOptionsMock = require('../../mocks/cli-options');
+const DependencyDescription = require('../../../lib/build/dependency-description').DependencyDescription;
 
 describe('the Bundle module', () => {
   let sut;
@@ -118,11 +119,16 @@ describe('the Bundle module', () => {
       return true;
     });
     bundler.configureDependency.and.callFake(dep => {
-      return Promise.resolve({
-        loaderConfig: {
-          name: dep.name || dep
-        }
-      });
+      let depName = dep.name || dep;
+      let description = new DependencyDescription(depName);
+
+      description.loaderConfig = {
+        name: depName,
+        path: '../node_modules/' + depName,
+        main: 'index.js'
+      };
+
+      return Promise.resolve(description);
     });
 
     let config = {
@@ -211,10 +217,12 @@ describe('the Bundle module', () => {
     let configuredDependencies = [];
     bundler.configureDependency.and.callFake(dep => {
       let depName = dep.name || dep;
-      let description = {
-        loaderConfig: {
-          name: depName
-        }
+
+      let description = new DependencyDescription(depName);
+      description.loaderConfig = {
+        name: depName,
+        path: '../node_modules/' + depName,
+        main: 'index.js'
       };
 
       return new Promise(resolve => {
@@ -262,11 +270,12 @@ describe('the Bundle module', () => {
   it('add dependencies in the same order as they were entered to prevent a wrong module load order', done => {
     let bundler = new BundlerMock();
     bundler.configureDependency.and.callFake(dep => {
-      return Promise.resolve({
-        loaderConfig: {
-          name: dep.name || dep
-        }
-      });
+      let description = new DependencyDescription(dep.name || dep);
+      description.loaderConfig = {
+        name: dep.name || dep
+      };
+
+      return Promise.resolve(description);
     });
     bundler.itemIncludedInBuild.and.callFake((dep) => true);
 

spec/lib/build/dependency-inclusion.spec.js

@@ -0,0 +1,100 @@
+'use strict';
+
+const BundlerMock = require('../../mocks/bundler');
+const DependencyInclusion = require('../../../lib/build/dependency-inclusion').DependencyInclusion;
+const DependencyDescription = require('../../../lib/build/dependency-description').DependencyDescription;
+const mockfs = require('mock-fs');
+
+describe('the DependencyInclusion module', () => {
+  let bundler;
+
+  beforeEach(() => {
+    bundler = new BundlerMock();
+  });
+
+  afterEach(() => {
+    mockfs.restore();
+  });
+
+  it('adds a dependency file to the bundle when there is a main file', () => {
+    let bundle = {
+      bundler: bundler
+    };
+
+    let description = new DependencyDescription();
+    description.loaderConfig = {
+      path: '../node_modules/my-package',
+      name: 'my-package',
+      main: 'index.js'
+    };
+    // eslint-disable-next-line no-unused-vars
+    let sut = new DependencyInclusion(bundle, description);
+
+    expect(bundler.addFile).toHaveBeenCalled();
+  });
+
+  it('adds a dependency file to the bundle when the path is a file', () => {
+    mockfs({
+      '../node_modules': {
+        'my-package': {
+          'index.js': 'some-content'
+        }
+      }
+    });
+
+    let bundle = {
+      bundler: bundler
+    };
+
+    let description = new DependencyDescription();
+    description.loaderConfig = {
+      path: '../node_modules/my-package/index.js',
+      name: 'my-package'
+    };
+
+    // eslint-disable-next-line no-unused-vars
+    let sut = new DependencyInclusion(bundle, description);
+
+    expect(bundler.addFile).toHaveBeenCalled();
+  });
+
+  it('does not add dependency file to the bundle when main is set to false', () => {
+    mockfs();
+
+    let bundle = {
+      bundler: bundler
+    };
+
+    let description = new DependencyDescription();
+    description.loaderConfig = {
+      path: '../node_modules/my-package',
+      name: 'my-package',
+      main: false
+    };
+
+    // eslint-disable-next-line no-unused-vars
+    let sut = new DependencyInclusion(bundle, description);
+
+    expect(bundler.addFile).not.toHaveBeenCalled();
+  });
+
+  it('adds dependency file to the bundle when main is set to something other than false', () => {
+    mockfs();
+
+    let bundle = {
+      bundler: bundler
+    };
+
+    let description = new DependencyDescription();
+    description.loaderConfig = {
+      path: '../node_modules/my-package',
+      name: 'my-package',
+      main: 'my-main-file.js'
+    };
+
+    // eslint-disable-next-line no-unused-vars
+    let sut = new DependencyInclusion(bundle, description);
+
+    expect(bundler.addFile).toHaveBeenCalled();
+  });
+});

spec/mocks/bundler.js

@@ -1,6 +1,8 @@
 'use strict';
 
 const Configuration = require('../../lib/configuration').Configuration;
+const CLIOptions = require('../../lib/cli-options').CLIOptions;
+const ProjectMock = require('./project-mock');
 
 module.exports = class Bundler {
   constructor() {
@@ -9,6 +11,8 @@ module.exports = class Bundler {
     this.configureDependency = jasmine.createSpy('configureDependency');
     this.addFile = jasmine.createSpy('addFile');
 
+    CLIOptions.instance = new CLIOptions();
     this.buildOptions  = new Configuration({}, {});
+    this.project = new ProjectMock();
   }
 };

spec/mocks/project-mock.js

@@ -0,0 +1,9 @@
+'use strict';
+
+module.exports = class ProjectMock {
+  constructor() {
+    this.paths = {
+      root: ''
+    };
+  }
+};