> For the complete documentation index, see [llms.txt](https://developers-apps-in-toss.toss.im/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://developers-apps-in-toss.toss.im/documentation/sdk/domains-api/device/device.subscribelocation.md).

# Device.subscribeLocation

> 함수형 API `startUpdateLocation`으로도 같은 기능을 쓸 수 있어요.

### 기능 설명

디바이스의 위치 변경을 계속 감지하고, 위치가 바뀔 때마다 `onEvent` 콜백을 실행해요. 반환하는 cleanup 함수로 구독을 해제해야 해요. `timeInterval`은 시스템 영향으로 지정한 값보다 길어질 수 있어요.

위치 권한이 없으면 `onError` 콜백에 `StartUpdateLocationPermissionError`(`GetCurrentLocationPermissionError`와 동일한 클래스)가 전달돼요. `Device.subscribeLocation.getPermission()` / `Device.subscribeLocation.openPermissionDialog()`로 권한을 확인·요청할 수 있어요.

### 타입

```ts
Device.subscribeLocation(params: StartUpdateLocationEventParams): () => void;
```

**Params**

```ts
type StartUpdateLocationEventParams = {
  onEvent: (location: Location) => void;
  onError: (error: unknown) => void;
  options: {
    accuracy: Accuracy;
    /** 위치 업데이트 최소 주기(ms)예요. */
    timeInterval: number;
    /** 위치 변경을 감지할 거리(m)예요. */
    distanceInterval: number;
  };
};
```

**Response**

구독을 해제하는 cleanup 함수(`() => void`)를 반환해요.

### 에러

에러는 `onError` 콜백에 클래스 인스턴스로 전달돼요 — `error instanceof StartUpdateLocationPermissionError`로 식별해요. 클래스는 `@apps-in-toss/web-framework`에서 import할 수 있어요.

| 에러 클래스                               | 설명                                                                                     |
| ------------------------------------ | -------------------------------------------------------------------------------------- |
| `StartUpdateLocationPermissionError` | 위치 업데이트 권한이 거부된 경우예요. `Device.subscribeLocation.openPermissionDialog()`로 다시 요청할 수 있어요. |

### 예시 코드

```js
import {
  Accuracy,
  Device,
  StartUpdateLocationPermissionError,
} from "@apps-in-toss/web-framework";

const cleanup = Device.subscribeLocation({
  options: {
    accuracy: Accuracy.Balanced,
    timeInterval: 3000,
    distanceInterval: 10,
  },
  onEvent: (location) => {
    console.log(location.coords.latitude, location.coords.longitude);
  },
  onError: (error) => {
    if (error instanceof StartUpdateLocationPermissionError) {
      console.warn("위치 권한이 없어요.");
      return;
    }
    console.error(error);
  },
});

// 구독 해제
cleanup();
```


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