improves observable dev tools (microsoft#254942)

Author: hediet

src/vs/base/common/observableInternal/logging/debugger/debuggerApi.d.ts

@@ -24,9 +24,15 @@ export type ObsDebuggerApi = {
 			getDerivedInfo(instanceId: ObsInstanceId): IDerivedObservableDetailedInfo;
 			getAutorunInfo(instanceId: ObsInstanceId): IAutorunDetailedInfo;
 			getObservableValueInfo(instanceId: ObsInstanceId): IObservableValueInfo;
+
 			setValue(instanceId: ObsInstanceId, jsonValue: unknown): void;
 			getValue(instanceId: ObsInstanceId): unknown;
 
+			// For autorun and deriveds
+			rerun(instanceId: ObsInstanceId): void;
+
+			logValue(instanceId: ObsInstanceId): void;
+
 			getTransactionState(): ITransactionState | undefined;
 		}
 	};

src/vs/base/common/observableInternal/logging/debugger/devToolsLogger.ts

@@ -135,7 +135,25 @@ export class DevToolsLogger implements IObservableLogger {
 					}
 
 					return undefined;
-				}
+				},
+				logValue: (instanceId) => {
+					const obs = this._aliveInstances.get(instanceId);
+					if (obs && 'get' in obs) {
+						console.log('Logged Value:', obs.get());
+					} else {
+						throw new BugIndicatingError('Observable is not supported');
+					}
+				},
+				rerun: (instanceId) => {
+					const obs = this._aliveInstances.get(instanceId);
+					if (obs instanceof Derived) {
+						obs.debugRecompute();
+					} else if (obs instanceof AutorunObserver) {
+						obs.debugRerun();
+					} else {
+						throw new BugIndicatingError('Observable is not supported');
+					}
+				},
 			}
 		};
 	});

src/vs/base/common/observableInternal/observables/derivedImpl.ts

@@ -400,6 +400,14 @@ export class Derived<T, TChangeSummary = any, TChange = void> extends BaseObserv
 		this._value = newValue as any;
 	}
 
+	public debugRecompute(): void {
+		if (!this._isComputing) {
+			this._recompute();
+		} else {
+			this._state = DerivedState.stale;
+		}
+	}
+
 	public setValue(newValue: T, tx: ITransaction, change: TChange): void {
 		this._value = newValue;
 		const observers = this._observers;