error while sending transaction with solanaweb3, [ReferenceError: Property 'Buffer' doesn't exist] in react native

Question

the part of code that causes const connection = new Connection('https://api.testnet.solana.com'); console.log(privateKey, '+++++++++');

  const feePayer = Keypair.fromSecretKey(bs58.decode(privateKey));
  console.log('feepair', feePayer);
  const transaction = new web3.Transaction().add(
    web3.SystemProgram.transfer({
      fromPubkey: feePayer.publicKey,
      toPubkey: data.to,
      lamports: web3.LAMPORTS_PER_SOL / 100,
    }),
  );

Answer 1

This happens because react-native doesn't have window.Buffer defined by default, which the web3.js library is trying to use.

You can fix it by adding to the top of your app:

global.Buffer = require('buffer').Buffer;