diff --git a/src/tsconfig.base.json b/src/tsconfig.base.json
index 52ace865e0b..b8dab46bfb6 100644
--- a/src/tsconfig.base.json
+++ b/src/tsconfig.base.json
@@ -15,6 +15,7 @@
 		},
 		"lib": [
 			"ES2015",
+			"ES2018.Promise",
 			"DOM",
 			"DOM.Iterable",
 			"WebWorker.ImportScripts"
diff --git a/src/tsconfig.monaco.json b/src/tsconfig.monaco.json
index 61377a881ff..1e169f96b3a 100644
--- a/src/tsconfig.monaco.json
+++ b/src/tsconfig.monaco.json
@@ -15,7 +15,6 @@
 	"include": [
 		"typings/require.d.ts",
 		"typings/thenable.d.ts",
-		"typings/lib.es2018.promise.d.ts",
 		"typings/lib.array-ext.d.ts",
 		"vs/css.d.ts",
 		"vs/monaco.d.ts",
diff --git a/src/typings/lib.es2018.promise.d.ts b/src/typings/lib.es2018.promise.d.ts
deleted file mode 100644
index 9f7b2d38cb2..00000000000
--- a/src/typings/lib.es2018.promise.d.ts
+++ /dev/null
@@ -1,27 +0,0 @@
-/*! *****************************************************************************
-Copyright (c) Microsoft Corporation. All rights reserved.
-Licensed under the Apache License, Version 2.0 (the "License"); you may not use
-this file except in compliance with the License. You may obtain a copy of the
-License at http://www.apache.org/licenses/LICENSE-2.0
-
-THIS CODE IS PROVIDED ON AN *AS IS* BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
-KIND, EITHER EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION ANY IMPLIED
-WARRANTIES OR CONDITIONS OF TITLE, FITNESS FOR A PARTICULAR PURPOSE,
-MERCHANTABLITY OR NON-INFRINGEMENT.
-
-See the Apache Version 2.0 License for specific language governing permissions
-and limitations under the License.
-***************************************************************************** */
-
-/**
- * Represents the completion of an asynchronous operation
- */
-interface Promise<T> {
-	/**
-	 * Attaches a callback that is invoked when the Promise is settled (fulfilled or rejected). The
-	 * resolved value cannot be modified from the callback.
-	 * @param onfinally The callback to execute when the Promise is settled (fulfilled or rejected).
-	 * @returns A Promise for the completion of the callback.
-	 */
-	finally(onfinally?: (() => void) | undefined | null): Promise<T>;
-}
diff --git a/src/typings/lib.webworker.importscripts.d.ts b/src/typings/lib.webworker.importscripts.d.ts
deleted file mode 100644
index e84f717c9a4..00000000000
--- a/src/typings/lib.webworker.importscripts.d.ts
+++ /dev/null
@@ -1,23 +0,0 @@
-/*! *****************************************************************************
-Copyright (c) Microsoft Corporation. All rights reserved.
-Licensed under the Apache License, Version 2.0 (the "License"); you may not use
-this file except in compliance with the License. You may obtain a copy of the
-License at http://www.apache.org/licenses/LICENSE-2.0
-
-THIS CODE IS PROVIDED ON AN *AS IS* BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
-KIND, EITHER EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION ANY IMPLIED
-WARRANTIES OR CONDITIONS OF TITLE, FITNESS FOR A PARTICULAR PURPOSE,
-MERCHANTABLITY OR NON-INFRINGEMENT.
-
-See the Apache Version 2.0 License for specific language governing permissions
-and limitations under the License.
-***************************************************************************** */
-
-
-
-
-/////////////////////////////
-/// WorkerGlobalScope APIs
-/////////////////////////////
-// These are only available in a Web Worker
-declare function importScripts(...urls: string[]): void;