src/vs/workbench/api/browser/mainThreadWebviewPanels.ts/MainThreadWebviewPanels/$unregisterSerializer
class MainThreadWebviewPanels:	public $unregisterSerializer(viewType: string): void {
		const reviver = this._revivers.get(viewType);
		if (!reviver) {
			throw new Error(`No reviver for ${viewType} registered`);
		}

		reviver.dispose();
		this._revivers.delete(viewType);
	}