How to use the expo-face-detector.FaceDetector.detectFacesAsync function in expo-face-detector
To help you get started, we’ve selected a few expo-face-detector examples, based on popular ways it is used in public projects.
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expo / expo / modules / camersja / GalleryScreen.js View on Github 
detectFace = photoUri =>
FaceDetector.detectFacesAsync(`${FileSystem.documentDirectory}photos/${photoUri}`, {
detectLandmarks: FaceDetector.Constants.Landmarks.none,
runClassifications: FaceDetector.Constants.Classifications.all,
})
.then(this.facesDetected)
.catch(this.handleFaceDetectionError);expo-face-detector
Lets you use the power of Google Mobile Vision (https://developers.google.com/vision/face-detection-concepts) framework to detect faces on images.
