1# @ohos.app.ability.common (Context) (System API) 2 3You can use this module to reference the ability public module class. 4 5> **NOTE** 6> 7> The initial APIs of this module are supported since API version 9. Newly added APIs will be marked with a superscript to indicate their earliest API version. 8> 9> The APIs of this module can be used only in the stage model. 10> 11> This topic describes only system APIs provided by the module. For details about its public APIs, see [@ohos.app.ability.common (Context)](js-apis-app-ability-common.md). 12 13## Modules to Import 14 15```ts 16import { common } from '@kit.AbilityKit'; 17``` 18## Properties 19 20**System capability**: SystemCapability.Ability.AbilityRuntime.Core 21 22| Name | Type | Read Only | Optional | Description | 23| ----- | ---- | ----- | ----- | -------------- | 24| ServiceExtensionContext | [ServiceExtensionContext](js-apis-inner-application-serviceExtensionContext-sys.md) | No | No | Level-2 module **ServiceExtensionContext**.<br>**System API**: This is a system API.| 25| AutoFillExtensionContext<sup>11+<sup> | [AutoFillExtensionContext](js-apis-inner-application-autoFillExtensionContext-sys.md) | No | No | Level-2 module **AutoFillExtensionContext**.<br>**System API**: This is a system API.| 26| AutoStartupInfo<sup>11+<sup> | [AutoStartupInfo](js-apis-inner-application-autoStartupInfo-sys.md) | No | No | Level-2 module **AutoStartupInfo**.<br>**System API**: This is a system API.| 27| AutoStartupCallback<sup>11+<sup> | [AutoStartupCallback](js-apis-inner-application-autoStartupCallback-sys.md) | No | No | Level-2 module **AutoStartupCallback**.<br>**System API**: This is a system API.| 28 29**Example** 30 31```ts 32import { common } from '@kit.AbilityKit'; 33 34let uiAbilityContext: common.UIAbilityContext; 35let abilityStageContext: common.AbilityStageContext; 36let applicationContext: common.ApplicationContext; 37let baseContext: common.BaseContext; 38let context: common.Context; 39let extensionContext: common.ExtensionContext; 40let formExtensionContext: common.FormExtensionContext; 41let vpnExtensionContext: common.VpnExtensionContext; 42let eventHub: common.EventHub; 43let pacMap: common.PacMap; 44let abilityResult: common.AbilityResult; 45let abilityStartCallback: common.AbilityStartCallback; 46let connectOptions: common.ConnectOptions; 47let autoFillExtensionContext: common.AutoFillExtensionContext; 48``` 49