react-native-fetch-blob.js

const fs = require('fs')

const replaced = 'import RNFetchBlob from \'../index.js\''
const replacement =
  'import {NativeModules} from \'react-native\';\nconst RNFetchBlob = NativeModules.RNFetchBlob'

const files = [
	'node_modules/rn-fetch-blob/polyfill/Fetch.js',
	'node_modules/rn-fetch-blob/polyfill/Blob.js',
	'node_modules/rn-fetch-blob/polyfill/XMLHttpRequest.js',
	'node_modules/rn-fetch-blob/polyfill/FileReader.js',
]

files.forEach(file => {
	fs.readFile(file, 'utf8', function (readErr, data) {
		if (readErr) {
			return null
		}
		const result = data.replace(new RegExp(replaced, 'g'), replacement)
		fs.writeFile(file, result, 'utf8', function (err) {
			if (err) {
				return null
			}
		})
	})
})