How to use the @ethersproject/bytes.isHexString function in @ethersproject/bytes

Interface.prototype.getEvent = function (nameOrSignatureOrTopic) {
        if (bytes_1.isHexString(nameOrSignatureOrTopic)) {
            var topichash = nameOrSignatureOrTopic.toLowerCase();
            for (var name_3 in this.events) {
                if (topichash === this.getEventTopic(name_3)) {
                    return this.events[name_3];
                }
            }
            logger.throwArgumentError("no matching event", "topichash", topichash);
        }
        // It is a bare name, look up the function (will return null if ambiguous)
        if (nameOrSignatureOrTopic.indexOf("(") === -1) {
            var name_4 = nameOrSignatureOrTopic.trim();
            var matching = Object.keys(this.events).filter(function (f) { return (f.split("(" /* fix:) */)[0] === name_4); });
            if (matching.length === 0) {
                logger.throwArgumentError("no matching event", "name", name_4);
            }
            else if (matching.length > 1) {

Interface.prototype.getFunction = function (nameOrSignatureOrSighash) {
        if (bytes_1.isHexString(nameOrSignatureOrSighash)) {
            for (var name_1 in this.functions) {
                if (nameOrSignatureOrSighash === this.getSighash(name_1)) {
                    return this.functions[name_1];
                }
            }
            logger.throwArgumentError("no matching function", "sighash", nameOrSignatureOrSighash);
        }
        // It is a bare name, look up the function (will return null if ambiguous)
        if (nameOrSignatureOrSighash.indexOf("(") === -1) {
            var name_2 = nameOrSignatureOrSighash.trim();
            var matching = Object.keys(this.functions).filter(function (f) { return (f.split("(" /* fix:) */)[0] === name_2); });
            if (matching.length === 0) {
                logger.throwArgumentError("no matching function", "name", name_2);
            }
            else if (matching.length > 1) {
                logger.throwArgumentError("multiple matching functions", "name", name_2);

bytecodeHex = hexlify(bytecode);
        }
        else if (bytecode && typeof (bytecode.object) === "string") {
            // Allow the bytecode object from the Solidity compiler
            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) {

Formatter.prototype.blockTag = function (blockTag) {
        if (blockTag == null) {
            return "latest";
        }
        if (blockTag === "earliest") {
            return "0x0";
        }
        if (blockTag === "latest" || blockTag === "pending") {
            return blockTag;
        }
        if (typeof (blockTag) === "number" || bytes_1.isHexString(blockTag)) {
            return bytes_1.hexValue(blockTag);
        }
        throw new Error("invalid blockTag");
    };
    // Requires a hash, optionally requires 0x prefix; returns prefixed lowercase hash.

function getChecksumAddress(address) {
    if (!isHexString(address, 20)) {
        logger.throwArgumentError("invalid address", "address", address);
    }
    address = address.toLowerCase();
    const chars = address.substring(2).split("");
    const expanded = new Uint8Array(40);
    for (let i = 0; i < 40; i++) {
        expanded[i] = chars[i].charCodeAt(0);
    }
    const hashed = arrayify(keccak256(expanded));
    for (let i = 0; i < 40; i += 2) {
        if ((hashed[i >> 1] >> 4) >= 8) {
            chars[i] = chars[i].toUpperCase();
        }
        if ((hashed[i >> 1] & 0x0f) >= 8) {
            chars[i + 1] = chars[i + 1].toUpperCase();
        }

function isBigNumberish(value) {
    return (value != null) && (BigNumber.isBigNumber(value) ||
        (typeof (value) === "number" && (value % 1) === 0) ||
        (typeof (value) === "string" && !!value.match(/^-?[0-9]+$/)) ||
        bytes_1.isHexString(value) ||
        (typeof (value) === "bigint") ||
        bytes_1.isBytes(value));
}
exports.isBigNumberish = isBigNumberish;

hex(value, strict) {
        if (typeof (value) === "string") {
            if (!strict && value.substring(0, 2) !== "0x") {
                value = "0x" + value;
            }
            if (isHexString(value)) {
                return value.toLowerCase();
            }
        }
        return logger.throwArgumentError("invalid hash", "value", value);
    }
    data(value, strict) {

function isAccount(value) {
    return (value != null && bytes_1.isHexString(value.privateKey, 32) && value.address != null);
}
var Wallet = /** @class */ (function (_super) {

decodeEventLog(eventFragment, data, topics) {
        if (typeof (eventFragment) === "string") {
            eventFragment = this.getEvent(eventFragment);
        }
        if (topics != null && !eventFragment.anonymous) {
            let topicHash = this.getEventTopic(eventFragment);
            if (!isHexString(topics[0], 32) || topics[0].toLowerCase() !== topicHash) {
                logger.throwError("fragment/topic mismatch", Logger.errors.INVALID_ARGUMENT, { argument: "topics[0]", expected: topicHash, value: topics[0] });
            }
            topics = topics.slice(1);
        }
        let indexed = [];
        let nonIndexed = [];
        let dynamic = [];
        eventFragment.inputs.forEach((param, index) => {
            if (param.indexed) {
                if (param.type === "string" || param.type === "bytes" || param.baseType === "tuple" || param.baseType === "array") {
                    indexed.push(ParamType.fromObject({ type: "bytes32", name: param.name }));
                    dynamic.push(true);
                }
                else {
                    indexed.push(param);
                    dynamic.push(false);

Formatter.prototype.callAddress = function (value) {
        if (!bytes_1.isHexString(value, 32)) {
            return null;
        }
        var address = address_1.getAddress(bytes_1.hexDataSlice(value, 12));
        return (address === constants_1.AddressZero) ? null : address;
    };
    Formatter.prototype.contractAddress = function (value) {