Add generator blueprint for prototype extensions.

Resolves #88

Author: chriskrycho

blueprints/ember-cli-typescript/files/types/__app_name__/index.d.ts

@@ -0,0 +1 @@
+<%= baseDeclarations(dasherizedPackageName) %>

blueprints/ember-cli-typescript/index.js

@@ -3,7 +3,16 @@
 const fs = require('fs');
 const path = require('path');
 
+const APP_DECLARATIONS = `
+declare global {
+  interface Array<T> extends Ember.ArrayPrototypeExtensions<T> {}
+  interface Function extends Ember.FunctionPrototypeExtensions {}
+}
+`;
+
 module.exports = {
+  APP_DECLARATIONS,
+
   description: 'Initialize files needed for typescript compilation',
 
   install(options) {
@@ -49,6 +58,11 @@ module.exports = {
 
         return JSON.stringify(paths, null, 2).replace(/\n/g, '\n    ');
       },
+      baseDeclarations: dasherizedName => {
+        const isDummyApp = dasherizedName === 'dummy';
+        const useAppDeclarations = !(isAddon || isDummyApp);
+        return useAppDeclarations ? APP_DECLARATIONS : '';
+      },
     };
   },
 

node-tests/blueprints/ember-cli-typescript-test.js

@@ -5,6 +5,8 @@ const path = require('path');
 const helpers = require('ember-cli-blueprint-test-helpers/helpers');
 const chaiHelpers = require('ember-cli-blueprint-test-helpers/chai');
 
+const ects = require('../../blueprints/ember-cli-typescript');
+
 const expect = chaiHelpers.expect;
 const file = chaiHelpers.file;
 
@@ -39,6 +41,7 @@ describe('Acceptance: ember-cli-typescript generator', function() {
 
         const projectTypes = file('types/my-app/index.d.ts');
         expect(projectTypes).to.exist;
+        expect(projectTypes).to.include(ects.APP_DECLARATIONS);
 
         const environmentTypes = file('types/my-app/config/environment.d.ts');
         expect(environmentTypes).to.exist;
@@ -72,6 +75,10 @@ describe('Acceptance: ember-cli-typescript generator', function() {
         });
 
         expect(tsconfigJson.include).to.deep.equal(['addon', 'tests']);
+
+        const projectTypes = file('types/my-addon/index.d.ts');
+        expect(projectTypes).to.exist;
+        expect(projectTypes).not.to.include(ects.APP_DECLARATIONS);
       });
   });
 
@@ -105,6 +112,10 @@ describe('Acceptance: ember-cli-typescript generator', function() {
         });
 
         expect(json.include).to.deep.equal(['app', 'tests', 'lib/my-addon-1', 'lib/my-addon-2']);
+
+        const projectTypes = file('types/my-app/index.d.ts');
+        expect(projectTypes).to.exist;
+        expect(projectTypes).to.include(ects.APP_DECLARATIONS);
       });
   });
 });