How to use the @ethersproject/abstract-signer.Signer.isSigner function in @ethersproject/abstract-signer

bytecodeHex = bytecode.object;
        }
        else {
            // Crash in the next verification step
            bytecodeHex = "!";
        }
        // Make sure it is 0x prefixed
        if (bytecodeHex.substring(0, 2) !== "0x") {
            bytecodeHex = "0x" + bytecodeHex;
        }
        // Make sure the final result is valid bytecode
        if (!isHexString(bytecodeHex) || (bytecodeHex.length % 2)) {
            logger.throwArgumentError("invalid bytecode", "bytecode", bytecode);
        }
        // If we have a signer, make sure it is valid
        if (signer && !Signer.isSigner(signer)) {
            logger.throwArgumentError("invalid signer", "signer", signer);
        }
        defineReadOnly(this, "bytecode", bytecodeHex);
        defineReadOnly(this, "interface", getStatic((new.target), "getInterface")(contractInterface));
        defineReadOnly(this, "signer", signer || null);
    }
    getDeployTransaction(...args) {

constructor(addressOrName, contractInterface, signerOrProvider) {
        logger.checkNew(new.target, Contract);
        // @TODO: Maybe still check the addressOrName looks like a valid address or name?
        //address = getAddress(address);
        defineReadOnly(this, "interface", getStatic((new.target), "getInterface")(contractInterface));
        if (Signer.isSigner(signerOrProvider)) {
            defineReadOnly(this, "provider", signerOrProvider.provider || null);
            defineReadOnly(this, "signer", signerOrProvider);
        }
        else if (Provider.isProvider(signerOrProvider)) {
            defineReadOnly(this, "provider", signerOrProvider);
            defineReadOnly(this, "signer", null);
        }
        else {
            logger.throwArgumentError("invalid signer or provider", "signerOrProvider", signerOrProvider);
        }
        defineReadOnly(this, "callStatic", {});
        defineReadOnly(this, "estimate", {});
        defineReadOnly(this, "functions", {});
        defineReadOnly(this, "populateTransaction", {});
        defineReadOnly(this, "filters", {});
        {