How to use the web3-core-method.EstimateGasMethodModel.prototype function in web3-core-method

if (options.from) {
        from = this.utils.toChecksumAddress(formatters.inputAddressFormatter(options.from));
    }

    options.from = from || web3Package.contractOptions.from;
    options.gasPrice = gasPrice || web3Package.contractOptions.gasPrice;
    options.gas = options.gas || options.gasLimit || web3Package.contractOptions.gas;

    // TODO replace with only gasLimit?
    delete options.gasLimit;

    return options;
};

EstimateGasOfContractMethodModel.prototype = Object.create(EstimateGasMethodModel.prototype);
EstimateGasOfContractMethodModel.prototype.constructor = EstimateGasOfContractMethodModel;

module.exports = EstimateGasOfContractMethodModel;

EstimateGasOfContractMethodModel.prototype.beforeExecution = function (web3Package) {
    this.parameters[0]['data'] = self.methodEncoder.encode(
        this.contractMethodParameters,
        this.abiItem,
        this.signature,
        web3Package.contractOptions.data
    );

    this.parameters[0] = this.getOrSetDefaultOptions(this.parameters[0], web3Package);

    EstimateGasMethodModel.prototype.beforeExecution.call(this, web3Package);
};