@react-native-module/get-random-values/lib/es/src/lib.js

implementation of getRandomValues for React Native

import { Environment } from '../node_modules/@react-native-module/utility/lib/es/index.js';

function getRandomBase64(byteLength) {
    // For running on Nodejs - testing, console etc.
    if (Environment !== 'NativeMobile') {
        try {
            if (Environment === 'Browser') {
                if (Buffer && globalThis.crypto && globalThis.crypto.getRandomValues) {
                    return Buffer.from(globalThis.crypto.getRandomValues(new Uint8Array(byteLength))).toString('base64');
                }
            }
            else if (Environment === 'NodeJs') {
                // in react-native got error directly
                // Error: Unable to resolve module crypto from ${path}: crypto could not be found within the project or in these directories:
                // so, set value to package.json "react-native": { "crypto": "react-native "}
                // eslint-disable-next-line @typescript-eslint/no-var-requires
                const nodeCryptoModule = require('crypto');
                return nodeCryptoModule.randomBytes(byteLength).toString('base64');
            }
        }
        catch (error) {
            // do nothing
        }
    }
    try {
        // eslint-disable-next-line @typescript-eslint/no-var-requires
        const { NativeModules } = require('react-native');
        if (NativeModules.RNGetRandomValues) {
            return NativeModules.RNGetRandomValues.getRandomBase64(byteLength);
        }
        else if (NativeModules.ExpoRandom) {
            // Expo SDK 41-44
            return NativeModules.ExpoRandom.getRandomBase64String(byteLength);
        }
        else if (global.ExpoModules) {
            // Expo SDK 45+
            return global.ExpoModules.ExpoRandom.getRandomBase64String(byteLength);
        }
        else {
            throw Error('Native module not found');
        }
    }
    catch (error) {
        throw Error('Native module not found');
    }
}

export { getRandomBase64 };