src/vs/platform/extensionManagement/common/extensionEnablementService.ts/StorageManager/get
class StorageManager:	get(key: string, scope: StorageScope): IExtensionIdentifier[] {
		let value: string;
		if (scope === StorageScope.GLOBAL) {
			if (isUndefinedOrNull(this.storage[key])) {
				this.storage[key] = this._get(key, scope);
			}
			value = this.storage[key];
		} else {
			value = this._get(key, scope);
		}
		return JSON.parse(value);
	}