feat: New useCameraPermission() and useMicrophonePermission() hooks (#1823)

* Create `useCameraPermission()` and `useMicrophonePermission()` hooks

* Fix exports

* Await `requestPermission()`

package/src/hooks/useCameraPermission.ts

@@ -0,0 +1,85 @@
+import { useCallback, useEffect, useState } from 'react';
+import { Camera } from '../Camera';
+
+interface PermissionState {
+  /**
+   * Whether the specified permission has explicitly been granted.
+   * By default, this will be `false`. To request permission, call `requestPermission()`.
+   */
+  hasPermission: boolean;
+  /**
+   * Requests the specified permission from the user.
+   * @returns Whether the specified permission has now been granted, or not.
+   */
+  requestPermission: () => Promise<boolean>;
+}
+
+/**
+ * Returns whether the user has granted permission to use the Camera, or not.
+ *
+ * If the user doesn't grant Camera Permission, you cannot use the `<Camera>`.
+ *
+ * @example
+ * ```tsx
+ * const { hasPermission, requestPermission } = useCameraPermission()
+ *
+ * if (!hasPermission) {
+ *   return <PermissionScreen onPress={requestPermission} />
+ * } else {
+ *   return <Camera ... />
+ * }
+ * ```
+ */
+export function useCameraPermission(): PermissionState {
+  const [hasPermission, setHasPermission] = useState(false);
+
+  const requestPermission = useCallback(async () => {
+    const result = await Camera.requestCameraPermission();
+    const hasPermissionNow = result === 'granted';
+    setHasPermission(hasPermissionNow);
+    return hasPermissionNow;
+  }, []);
+
+  useEffect(() => {
+    Camera.getCameraPermissionStatus().then((s) => setHasPermission(s === 'granted'));
+  }, []);
+
+  return {
+    hasPermission,
+    requestPermission,
+  };
+}
+
+/**
+ * Returns whether the user has granted permission to use the Microphone, or not.
+ *
+ * If the user doesn't grant Audio Permission, you can use the `<Camera>` but you cannot
+ * record videos with audio (the `audio={..}` prop).
+ *
+ * @example
+ * ```tsx
+ * const { hasPermission, requestPermission } = useMicrophonePermission()
+ * const canRecordAudio = hasPermission
+ *
+ * return <Camera video={true} audio={canRecordAudio} />
+ * ```
+ */
+export function useMicrophonePermission(): PermissionState {
+  const [hasPermission, setHasPermission] = useState(false);
+
+  const requestPermission = useCallback(async () => {
+    const result = await Camera.requestMicrophonePermission();
+    const hasPermissionNow = result === 'granted';
+    setHasPermission(hasPermissionNow);
+    return hasPermissionNow;
+  }, []);
+
+  useEffect(() => {
+    Camera.getMicrophonePermissionStatus().then((s) => setHasPermission(s === 'granted'));
+  }, []);
+
+  return {
+    hasPermission,
+    requestPermission,
+  };
+}