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true,\n get: function () {\n return FacingModeToCameraType;\n }\n });\n // https://developer.mozilla.org/en-US/docs/Web/API/MediaTrackConstraints/aspectRatio\n const VIDEO_ASPECT_RATIOS = {\n '3840x2160': 3840 / 2160,\n '1920x1080': 1920 / 1080,\n '1280x720': 1280 / 720,\n '640x480': 640 / 480,\n '352x288': 352 / 288\n };\n const PictureSizes = Object.keys(VIDEO_ASPECT_RATIOS);\n const ImageTypeFormat = {\n jpg: 'image/jpeg',\n png: 'image/png'\n };\n const MinimumConstraints = {\n audio: false,\n video: true\n };\n const CameraTypeToFacingMode = {\n front: 'user',\n back: 'environment'\n };\n const FacingModeToCameraType = {\n user: 'front',\n environment: 'back'\n 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