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We can't just assign an object\n // with getUserMedia as it would overwrite existing properties.\n // Here, we will just add the getUserMedia property if it's missing.\n\n // First get ahold of the legacy getUserMedia, if present\n const getUserMedia =\n // TODO: this method is deprecated, migrate to https://developer.mozilla.org/en-US/docs/Web/API/MediaDevices/getUserMedia\n navigator.getUserMedia ||\n navigator.webkitGetUserMedia ||\n navigator.mozGetUserMedia ||\n function () {\n const error: any = new Error('Permission unimplemented');\n error.code = 0;\n error.name = 'NotAllowedError';\n throw error;\n };\n\n return new Promise((resolve, reject) => {\n getUserMedia.call(navigator, constraints, resolve, reject);\n });\n}\n\nfunction handleGetUserMediaError({ message }: { message: string }): PermissionResponse {\n // name: NotAllowedError\n // code: 0\n if (message === 'Permission dismissed') {\n return {\n status: PermissionStatus.UNDETERMINED,\n expires: 'never',\n canAskAgain: true,\n granted: false,\n };\n } else {\n return {\n status: PermissionStatus.DENIED,\n expires: 'never',\n canAskAgain: true,\n granted: false,\n };\n }\n}\n\nasync function handleRequestPermissionsAsync(): Promise<PermissionResponse> {\n try {\n await getUserMedia({\n video: true,\n });\n return {\n status: PermissionStatus.GRANTED,\n expires: 'never',\n canAskAgain: true,\n granted: true,\n };\n } catch ({ message }) {\n return handleGetUserMediaError({ message });\n }\n}\n\nasync function handlePermissionsQueryAsync(): Promise<PermissionResponse> {\n if (!navigator?.permissions?.query) {\n throw new UnavailabilityError(\n 'expo-barcode-scanner',\n 'navigator.permissions API is not available'\n );\n }\n\n const { state } = await navigator.permissions.query({ name: 'camera' });\n switch (state) {\n case 'prompt':\n return {\n status: PermissionStatus.UNDETERMINED,\n expires: 'never',\n canAskAgain: true,\n granted: false,\n };\n case 'granted':\n return {\n status: PermissionStatus.GRANTED,\n expires: 'never',\n canAskAgain: true,\n granted: true,\n };\n case 'denied':\n return {\n status: PermissionStatus.DENIED,\n expires: 'never',\n canAskAgain: true,\n granted: false,\n };\n }\n}\n\nexport default {\n get name(): string {\n return 'ExpoBarCodeScannerModule';\n },\n get BarCodeType() {\n return {\n code39mod43: 'code39mod43',\n code138: 'code138',\n interleaved2of5: 'interleaved2of5',\n aztec: 'aztec',\n ean13: 'ean13',\n ean8: 'ean8',\n qr: 'qr',\n pdf417: 'pdf417',\n upc_e: 'upc_e',\n datamatrix: 'datamatrix',\n code39: 'code39',\n code93: 'code93',\n itf14: 'itf14',\n codabar: 'codabar',\n code128: 'code128',\n upc_a: 'upc_a',\n };\n },\n get Type() {\n return { front: 'front', back: 'back' };\n },\n async requestPermissionsAsync(): Promise<PermissionResponse> {\n return handleRequestPermissionsAsync();\n },\n async getPermissionsAsync(): Promise<PermissionResponse> {\n return handlePermissionsQueryAsync();\n },\n};\n"]}