src/vs/workbench/api/browser/mainThreadStorage.ts/MainThreadStorage/$initializeExtensionStorage
class MainThreadStorage:	async $initializeExtensionStorage(shared: boolean, extensionId: string): Promise<object | undefined> {

		await this.checkAndMigrateExtensionStorage(extensionId, shared);

		if (shared) {
			this._sharedStorageKeysToWatch.set(extensionId, true);
		}
		return this._extensionStorageService.getExtensionState(extensionId, shared);
	}