Differential D7973 Diff 27252 native/utils/blob-utils-module.js

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				// @flow

				import { requireNativeModule } from 'expo-modules-core';
				import RNBlob from 'react-native/Libraries/Blob/Blob.js';
				import BlobManager from 'react-native/Libraries/Blob/BlobManager.js';
				import type { BlobData } from 'react-native/Libraries/Blob/BlobTypes.js';

				const BlobUtilsModule: {
				+copyBlobToTypedArray: (blob: BlobData, destination: Uint8Array) => void,
				+blobFromTypedArray: (data: $TypedArray) => string,
				} = requireNativeModule('BlobUtils');

				function arrayBufferFromBlob(blob: Blob): ArrayBuffer {
				// $FlowFixMe: react-native Blob type is incompatible with global Blob type
				const rnBlob = (blob: RNBlob);
				if (!(rnBlob instanceof RNBlob)) {
				throw new Error(
				'Given blob is not a React Native blob. Missing "data" property.',
				);
				}
				const blobData = rnBlob.data;

				const resultArray = new Uint8Array(blob.size);
				BlobUtilsModule.copyBlobToTypedArray(blobData, resultArray);
				return resultArray.buffer;
				}

				function blobFromArrayBuffer(arrayBuffer: ArrayBuffer, type?: string): Blob {
				const typedArray = new Uint8Array(arrayBuffer);
				const blobID = BlobUtilsModule.blobFromTypedArray(typedArray);
				const reactNativeBlob = BlobManager.createFromOptions({
				blobId: blobID,
				offset: 0,
				size: arrayBuffer.byteLength,
				type: type \|\| '',
				lastModified: Date.now(),
				});

				// $FlowFixMe: react-native Blob type is incompatible with global Blob type
				// $FlowFixMe: even though they have the same properties
				return (reactNativeBlob: Blob);
				}

				export { arrayBufferFromBlob, blobFromArrayBuffer };