chore(build): Produce .d.ts files for build tools

Closes #7763

gulpfile.js

@@ -1093,10 +1093,13 @@ gulp.task('!build.tools', function() {
                    .pipe(tsc({
                      target: 'ES5',
                      module: 'commonjs',
+                     declaration: true,
                      // Don't use the version of typescript that gulp-typescript depends on
                      // see https://github.com/ivogabe/gulp-typescript#typescript-version
                      typescript: require('typescript')
-                   }))
+                   }));
+  stream =
+      merge2([stream.js.pipe(gulp.dest('dist/tools')), stream.dts.pipe(gulp.dest('dist/tools'))])
           .on('error',
               function(error) {
                 // nodejs doesn't propagate errors from the src stream into the final
@@ -1105,10 +1108,8 @@ gulp.task('!build.tools', function() {
                 stream.emit('error', error);
               })
           .pipe(sourcemaps.write('.'))
-                   .pipe(gulp.dest('dist/tools'))
           .on('end', function() {
-                     var AngularBuilder =
+            var AngularBuilder = require('./dist/tools/broccoli/angular_builder').AngularBuilder;
-                         require('./dist/tools/broccoli/angular_builder').AngularBuilder;
             angularBuilder =
                 new AngularBuilder({outputPath: 'dist', dartSDK: DART_SDK, logs: logs});
           });

tools/broccoli/angular_builder.ts

@@ -6,17 +6,16 @@ var path = require('path');
 var printSlowTrees = require('broccoli-slow-trees');
 var Q = require('q');
 
-type ProjectMap = {
+export type ProjectMap = {
   [key: string]: boolean
 };
 
-type Options = {
+export type Options = {
   projects: ProjectMap;
   noTypeChecks: boolean;
   generateEs6: boolean;
   useBundles: boolean;
-}
+};
-;
 
 /**
  * BroccoliBuilder facade for all of our build pipelines.

tools/broccoli/broccoli-lodash.ts

@@ -4,7 +4,7 @@ import path = require('path');
 var _ = require('lodash');
 import {wrapDiffingPlugin, DiffingBroccoliPlugin, DiffResult} from './diffing-broccoli-plugin';
 
-interface LodashRendererOptions {
+export interface LodashRendererOptions {
   encoding?: string;
   context?: any;
   // files option unsupported --- use Funnel on inputTree instead.

tools/broccoli/broccoli-merge-trees.ts

@@ -6,9 +6,7 @@ import {wrapDiffingPlugin, DiffingBroccoliPlugin, DiffResult} from './diffing-br
 
 var isWindows = process.platform === 'win32';
 
-interface MergeTreesOptions {
+export interface MergeTreesOptions { overwrite?: boolean; }
-  overwrite?: boolean;
-}
 
 function outputFileSync(sourcePath, destPath) {
   let dirname = path.dirname(destPath);

tools/broccoli/broccoli-tree-stabilizer.ts

@@ -40,6 +40,6 @@ class TreeStabilizer implements BroccoliTree {
 }
 
 
-export default function stabilizeTree(inputTree) {
+export default function stabilizeTree(inputTree): BroccoliTree {
   return new TreeStabilizer(inputTree);
 }

tools/broccoli/diffing-broccoli-plugin.ts

@@ -33,7 +33,7 @@ export interface DiffingBroccoliPlugin {
 }
 
 
-type DiffingPluginWrapperFactory = (inputTrees: (BroccoliTree | BroccoliTree[]), options?) =>
+export type DiffingPluginWrapperFactory = (inputTrees: (BroccoliTree | BroccoliTree[]), options?) =>
     BroccoliTree;