fix(build): Make the build work on windows (#2231)

As suggested in
#1799 (comment)

package.json

@@ -11,7 +11,7 @@
     "karma": "karma start",
     "test:universal": "npm run build && cp -R dist/packages-dist test/universal-test/node_modules/angularfire2 && cd test/universal-test && npm run prerender",
     "delayed_karma": "sleep 10 && karma start",
-    "build": "rm -rf dist && node tools/build.js && npm pack ./dist/packages-dist",
+    "build": "rimraf dist && node tools/build.js && npm pack ./dist/packages-dist",
     "changelog": "conventional-changelog -p angular -i CHANGELOG.md -s -r 1",
     "build:wrapper": "npm i --prefix wrapper && npm run --prefix wrapper build && npm pack ./dist/wrapper-dist"
   },

tools/build.js

@@ -5,6 +5,7 @@ const { switchMap, switchMapTo, tap } = require('rxjs/operators');
 const { copy, readFileSync, writeFile, writeFileSync, statSync } = require('fs-extra');
 const { prettySize } = require('pretty-size');
 const gzipSize = require('gzip-size');
+const path = require('path');
 const resolve = require('rollup-plugin-node-resolve');
 const pkg = require(`${process.cwd()}/package.json`);
 
@@ -124,8 +125,10 @@ const DEST_PKG_PATHS = {
 };
 
 // Constants for running typescript commands
-const TSC = 'node_modules/.bin/tsc';
-const NGC = 'node_modules/.bin/ngc';
+const binSuffix = process.platform === "win32" ? '.cmd' : '';
+const TSC = path.normalize('node_modules/.bin/tsc' + binSuffix);
+const NGC = path.normalize('node_modules/.bin/ngc' +  binSuffix);
+
 const TSC_ARGS = (name, config = 'build') => [`-p`, `${process.cwd()}/src/${name}/tsconfig-${config}.json`];
 const TSC_TEST_ARGS = [`-p`, `${process.cwd()}/src/tsconfig-test.json`];
 
@@ -408,4 +411,4 @@ database-deprecated.umd.js - ${dbdepStats.size}, ${dbdepStats.gzip}
     }));
 }
 
-buildLibrary(GLOBALS).subscribe(() => { }, err => { console.error(err) });
+buildLibrary(GLOBALS).subscribe(() => { }, err => { console.error(err) });