definedName() {
        return new ArgHandler("Workbook.definedName")
            .case('string', name => {
                return this.scopedDefinedName(undefined, name);
            })
            .case(['string', '*'], (name, refersTo) => {
                this.scopedDefinedName(undefined, name, refersTo);
                return this;
            })
            .handle(arguments);
    }
Set a defined name scoped to the workbook.
@param {string} name - The defined name.
@param {string|Cell|Range|Row|Column} refersTo - What the name refers to.
@returns {Workbook} The workbook.