@wagmi/core/src/utils/normalizeChainId.ts

VanillaJS library for Ethereum

/** @deprecated use `Number` instead */
export function normalizeChainId(chainId: bigint | number | string | unknown) {
  if (typeof chainId === 'string')
    return Number.parseInt(
      chainId,
      chainId.trim().substring(0, 2) === '0x' ? 16 : 10,
    )
  if (typeof chainId === 'bigint') return Number(chainId)
  if (typeof chainId === 'number') return chainId
  throw new Error(
    `Cannot normalize chainId "${chainId}" of type "${typeof chainId}"`,
  )
}