Web3 integration · hard

42. Multi-chain config lookup

Build a block-explorer URL from chain config.

Write `txUrl(chains, chainId, hash)` where `chains` maps chain id to `{ explorerUrl }`, returning `` `${explorerUrl}/tx/${hash}` `` or throwing `new Error("unsupported chain")` if not found.

Required in your answer: throw new Error

Transpiled, then run in a sandbox

function txUrl(chains, chainId, hash) {
  // TODO
}

Output appears here.

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