src/vs/workbench/api/browser/mainThreadStorage.ts/MainThreadStorage/_getValue
class MainThreadStorage:	private _getValue<T>(shared: boolean, key: string): T | undefined {
		const jsonValue = this._storageService.get(key, shared ? StorageScope.GLOBAL : StorageScope.WORKSPACE);
		if (!jsonValue) {
			return undefined;
		}
		return JSON.parse(jsonValue);
	}