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| UIServiceExtensionContext<sup>13+<sup> | [UIServiceExtensionContext ](js-apis-inner-application-uiserviceExtensionContext-sys.md) |  No | No |Level-2 module **UIServiceExtensionContext**.<br>**System API**: This is a system API.|
29| UIServiceHostProxy<sup>13+<sup> | [UIServiceHostProxy](js-apis-inner-application-uiservicehostproxy-sys.md) |  No | No | Level-2 module **UIServiceHostProxy**.<br>**System API**: This is a system API.|
30
31**Example**
32
33```ts
34import { common } from '@kit.AbilityKit';
35
36let uiAbilityContext: common.UIAbilityContext;
37let abilityStageContext: common.AbilityStageContext;
38let applicationContext: common.ApplicationContext;
39let baseContext: common.BaseContext;
40let context: common.Context;
41let extensionContext: common.ExtensionContext;
42let formExtensionContext: common.FormExtensionContext;
43let vpnExtensionContext: common.VpnExtensionContext;
44let eventHub: common.EventHub;
45let pacMap: common.PacMap;
46let abilityResult: common.AbilityResult;
47let abilityStartCallback: common.AbilityStartCallback;
48let connectOptions: common.ConnectOptions;
49let autoFillExtensionContext: common.AutoFillExtensionContext;
50let uiServiceExtensionContext: common.UIServiceExtensionContext;
51let uiServiceHostProxy: common.UIServiceHostProxy;
52```
53