test(packaging): added test for source map correctness

tools/gulp-tasks/source-map-test.js

@@ -0,0 +1,22 @@
+const fs = require('fs');
+const path = require('path');
+const sourceMapTest = require('../source-map-test');
+
+const excludedPackages = ['bazel', 'tsc-wrapped', 'benchpress', 'compiler-cli', 'language-service'];
+
+module.exports = (gulp) => () => {
+  const packageDir = path.resolve(process.cwd(), 'dist/packages-dist/');
+  const packages =
+      fs.readdirSync(packageDir).filter(package => excludedPackages.indexOf(package) === -1);
+
+  packages.forEach(package => {
+    if (sourceMapTest(package).length) {
+      process.exit(1);
+    }
+  });
+
+  if (!packages.length) {
+    console.log('No packages found in packages-dist. Unable to run source map test.');
+    process.exit(1);
+  }
+};