Patch react-native to support read ArrayBuffer from blob

patches/react-native+0.71.8.patch

@@ -0,0 +1,51 @@
+diff --git a/node_modules/react-native/Libraries/Blob/FileReader.js b/node_modules/react-native/Libraries/Blob/FileReader.js
+index 57b3093..e1fef89 100644
+--- a/node_modules/react-native/Libraries/Blob/FileReader.js
++++ b/node_modules/react-native/Libraries/Blob/FileReader.js
+@@ -12,6 +12,8 @@ import type Blob from './Blob';
+
+ import NativeFileReaderModule from './NativeFileReaderModule';
+
++import { toByteArray } from 'base64-js';
++
+ const EventTarget = require('event-target-shim');
+
+ type ReadyState =
+@@ -74,8 +76,35 @@ class FileReader extends (EventTarget(...READER_EVENTS): any) {
+     }
+   }
+
+-  readAsArrayBuffer(): any {
+-    throw new Error('FileReader.readAsArrayBuffer is not implemented');
++  readAsArrayBuffer(blob: ?Blob): any {
++    this._aborted = false;
++
++    if (blob == null) {
++      throw new TypeError(
++        "Failed to execute 'readAsArrayBuffer' on 'FileReader': parameter 1 is not of type 'Blob'",
++      );
++    }
++
++    NativeFileReaderModule.readAsDataURL(blob.data).then(
++      (text: string) => {
++        if (this._aborted) {
++          return;
++        }
++
++        const base64 = text.split(',')[1];
++        const typedArray = toByteArray(base64);
++
++        this._result = typedArray.buffer;
++        this._setReadyState(DONE);
++      },
++      error => {
++        if (this._aborted) {
++          return;
++        }
++        this._error = error;
++        this._setReadyState(DONE);
++      },
++    );
+   }
+
+   readAsDataURL(blob: ?Blob): void {