export class Utils { static isAddress = ( address ) => { return typeof address === "string" && address . match ( /^0x[0-9A-Fa-f]{40}$/ ) ; } ; static isABI = ( abi ) => { return abi && Array . isArray ( abi ) ; } ; static isEthersJsSigner = ( signer ) => { return signer && signer . _ethersType === "Signer" ; } ; } export default Utils ;