I recently installed the @solana packages in order to use the Solana Wallet Adapter but am now running into build errors. The packages I installed using npm are

  • @solana/wallet-adapter-base ^0.9.16
  • @solana/wallet-adapter-react ^0.15.18
  • @solana/wallet-adapter-react-ui ^0.9.16
  • @solana/web3.js ^1.54.1
  • @solana/wallet-adapter-wallets ^0.18.7

The build error I get is

./node_modules/@solana/web3.js/lib/index.browser.esm.js 3673:30
Module parse failed: Identifier directly after number (3673:30)
You may need an appropriate loader to handle this file type.
|     key: "isActive",
|     value: function isActive() {
>       var U64_MAX = Math.pow(2n, 64n) - 1n;
|       return this.state.deactivationSlot === U64_MAX;
|     }

I am currently running react ^18.1.0

2 Answers 2


Two problems here:

  1. Your compiler looks like it's using a transform that turns 2n ** 64n into Math.pow(2n, 64n). This is actually illegal because Math.pow() does not support BigInt – only number. An example of such a transform is babel/plugin-transform-exponentiation-operator.
  2. BigInt literal expressions (eg. 2n) are only supported when your compiler targets ES2020. One solution is to upgrade your compiler's target, but another solution is to file an issue against @solana-labs/solana asking for these literals to be rewritten as BigInt(2) and BigInt(64).

Your build problems stem from the fact that the version of React Native you're using runs code in a JavaScript environment that doesn't support BigInt, and BigInt is required by versions of @solana/web3.js from v1.41.7 and onward.

One solution is to install (or upgrade to) React Native 0.70 and switch to the Hermes JavaScript engine.

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.