src/vs/platform/userDataSync/common/extensionsStorageSync.ts/ExtensionsStorageSyncService/onDidChangeStorageValue
class ExtensionsStorageSyncService:	private onDidChangeStorageValue(e: IStorageValueChangeEvent): void {
		if (e.scope !== StorageScope.GLOBAL) {
			return;
		}

		// State of extension with keys for sync has changed
		if (this.extensionsWithKeysForSync.has(e.key.toLowerCase())) {
			this._onDidChangeExtensionsStorage.fire();
			return;
		}

		// Keys for sync of an extension has changed
		const extensionIdWithVersion = ExtensionsStorageSyncService.fromKey(e.key);
		if (extensionIdWithVersion) {
			this.extensionsWithKeysForSync.add(extensionIdWithVersion.id.toLowerCase());
			this._onDidChangeExtensionsStorage.fire();
			return;
		}
	}