Function getFunctionOption

lib/methods/aggregate.js:32–38

(options, key, required)

};

const getFunctionOption = (options, key, required) => {
	const value = key in options ? options[key] : null;
	if (typeof value === 'function') return value;
	if (value != null) throw new TypeError(`Expected the "${key}" option to be a function`);
	if (required) throw new TypeError(`Missing required option "${key}"`);
	return null;
};

const getLength = ({ length }) => {
	if (Number.isInteger(length) && length >= 0) return length;