debt - avoid some StrictNullOverride

src/vs/base/parts/ipc/node/ipc.cp.ts

@@ -86,7 +86,7 @@ export interface IIPCOptions {
 
 export class Client implements IChannelClient, IDisposable {
 
-	private disposeDelayer: Delayer<void>;
+	private disposeDelayer: Delayer<void> | undefined;
 	private activeRequests = new Set<IDisposable>();
 	private child: ChildProcess | null;
 	private _client: IPCClient | null;
@@ -137,7 +137,7 @@ export class Client implements IChannelClient, IDisposable {
 			cancellationTokenListener.dispose();
 			this.activeRequests.delete(disposable);
 
-			if (this.activeRequests.size === 0) {
+			if (this.activeRequests.size === 0 && this.disposeDelayer) {
 				this.disposeDelayer.trigger(() => this.disposeClient());
 			}
 		});
@@ -271,8 +271,10 @@ export class Client implements IChannelClient, IDisposable {
 
 	dispose() {
 		this._onDidProcessExit.dispose();
-		this.disposeDelayer.cancel();
-		this.disposeDelayer = null!; // StrictNullOverride: nulling out ok in dispose
+		if (this.disposeDelayer) {
+			this.disposeDelayer.cancel();
+			this.disposeDelayer = undefined;
+		}
 		this.disposeClient();
 		this.activeRequests.clear();
 	}

src/vs/platform/files/node/watcher/win32/csharpWatcherService.ts

@@ -134,7 +134,7 @@ export class OutOfProcessWin32FolderWatcher {
 	public dispose(): void {
 		if (this.handle) {
 			this.handle.kill();
-			this.handle = null!; // StrictNullOverride: nulling out ok in dispose
+			this.handle = undefined;
 		}
 	}
 }