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extension/src/DataSource/DataSource.ts

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+import { DataExtractorId } from "@hediet/debug-visualizer-data-extraction";
+import { DataExtractionState } from "@hediet/debug-visualizer-vscode-shared";
+
+export interface DataSource {
+	createEvaluationWatcher(expression: string): EvaluationWatcher;
+}
+
+export interface EvaluationWatcher {
+	readonly expression: string;
+
+	// is observable
+	readonly preferredDataExtractor: DataExtractorId | undefined;
+
+	setPreferredDataExtractor(id: DataExtractorId): void;
+
+	refresh(): void;
+
+	// is observable
+	state: DataExtractionState;
+
+	dispose(): void;
+}