Be explicit about certain things to help the editor tree-shaking

src/vs/base/browser/ui/tree/objectTree.ts

@@ -162,7 +162,7 @@ function asObjectTreeOptions<T, TFilterData>(compressedTreeNodeProvider: () => I
 	};
 }
 
-export class CompressibleObjectTree<T extends NonNullable<any>, TFilterData = void> extends ObjectTree<T, TFilterData> {
+export class CompressibleObjectTree<T extends NonNullable<any>, TFilterData = void> extends ObjectTree<T, TFilterData> implements ICompressedTreeNodeProvider<T, TFilterData> {
 
 	protected model: CompressibleObjectTreeModel<T, TFilterData>;
 

src/vs/platform/opener/common/opener.ts

@@ -65,5 +65,5 @@ export const NullOpenerService: IOpenerService = Object.freeze({
 	registerValidator() { return Disposable.None; },
 	registerExternalUriResolver() { return Disposable.None; },
 	open() { return Promise.resolve(false); },
-	async resolveExternalUri(uri) { return { resolved: uri, dispose() { } }; },
+	async resolveExternalUri(uri: URI) { return { resolved: uri, dispose() { } }; },
 });