Version 2.2.0.

* Adds support for custom injected scripts with automatic reload
* Refactors extension

extension/src/VisualizationBackend/VisualizationBackend.ts

@@ -0,0 +1,80 @@
+import {
+	DataExtractionResult,
+	DataExtractorId,
+} from "@hediet/debug-visualizer-data-extraction";
+import { Disposable } from "@hediet/std/disposable";
+import { DebugSessionProxy } from "../proxies/DebugSessionProxy";
+import { CompletionItem, FormattedMessage } from "../webviewContract";
+import { reaction } from "mobx";
+import { DebuggerViewProxy } from "../proxies/DebuggerViewProxy";
+import { EventEmitter, EventSource } from "@hediet/std/events";
+
+export interface DebugSessionVisualizationSupport {
+	createBackend(session: DebugSessionProxy): VisualizationBackend | undefined;
+}
+
+export interface VisualizationBackend extends Disposable {
+	readonly onChange: EventSource;
+
+	getVisualizationData(
+		args: GetVisualizationDataArgs
+	): Promise<
+		| { kind: "data"; result: DataExtractionResult }
+		| { kind: "error"; message: FormattedMessage }
+	>;
+
+	/**
+	 * The language that expressions must be written in.
+	 */
+	readonly expressionLanguageId: string | undefined;
+
+	getCompletions(text: string, column: number): Promise<CompletionItem[]>;
+}
+
+export interface GetVisualizationDataArgs {
+	expression: string;
+	preferredExtractorId: DataExtractorId | undefined;
+}
+
+export abstract class VisualizationBackendBase implements VisualizationBackend {
+	public readonly dispose = Disposable.fn();
+
+	protected readonly onChangeEmitter = new EventEmitter();
+	public readonly onChange = this.onChangeEmitter;
+
+	constructor(
+		protected readonly debugSession: DebugSessionProxy,
+		protected readonly debuggerView: DebuggerViewProxy
+	) {
+		this.dispose.track({
+			dispose: reaction(
+				() => debuggerView.getActiveStackFrameId(debugSession),
+				activeStackFrameId => {
+					if (activeStackFrameId !== undefined) {
+						this.onChangeEmitter.emit();
+					}
+				}
+			),
+		});
+	}
+
+	public abstract readonly expressionLanguageId: string | undefined;
+
+	public abstract getVisualizationData(
+		args: GetVisualizationDataArgs
+	): Promise<
+		| { kind: "data"; result: DataExtractionResult }
+		| { kind: "error"; message: FormattedMessage }
+	>;
+
+	public async getCompletions(
+		text: string,
+		column: number
+	): Promise<CompletionItem[]> {
+		return await this.debugSession.getCompletions({
+			text,
+			frameId: this.debuggerView.getActiveStackFrameId(this.debugSession),
+			column,
+		});
+	}
+}