diff --git a/assertion-error/assertion-error-tests.d.ts b/assertion-error/assertion-error-tests.ts
similarity index 68%
rename from assertion-error/assertion-error-tests.d.ts
rename to assertion-error/assertion-error-tests.ts
index b2a33a307ac4a3..f03e9cb52e539c 100644
--- a/assertion-error/assertion-error-tests.d.ts
+++ b/assertion-error/assertion-error-tests.ts
@@ -10,6 +10,6 @@ function foo () {
 }
 
 e = new AssertionError(str);
-e = new AssertionError(str, {a:1, b2});
-e = new AssertionError(str, {a:1, b2}, foo);
+e = new AssertionError(str, {a:1, b:2});
+e = new AssertionError(str, {a:1, b:2}, foo);
 
diff --git a/detect-indent/detect-indent-tests.d.ts b/detect-indent/detect-indent-tests.ts
similarity index 65%
rename from detect-indent/detect-indent-tests.d.ts
rename to detect-indent/detect-indent-tests.ts
index d56854ae09f5f6..4ee02471b8641e 100644
--- a/detect-indent/detect-indent-tests.d.ts
+++ b/detect-indent/detect-indent-tests.ts
@@ -1,4 +1,4 @@
-/// <reference path="detect-indent-tests.d.ts" />
+/// <reference path="detect-indent.d.ts" />
 
 import di = require('detect-indent');
 
diff --git a/source-map-support/source-map-support-tests.d.ts b/source-map-support/source-map-support-tests.ts
similarity index 100%
rename from source-map-support/source-map-support-tests.d.ts
rename to source-map-support/source-map-support-tests.ts
diff --git a/source-map-support/source-map-support.d.ts b/source-map-support/source-map-support.d.ts
index c03c23d8517996..8d4e2257969d20 100644
--- a/source-map-support/source-map-support.d.ts
+++ b/source-map-support/source-map-support.d.ts
@@ -4,5 +4,5 @@
 // Definitions: https://github.com/borisyankov/DefinitelyTyped
 
 declare module 'source-map-support' {
-	export function install();
+	export function install(): any;
 }