_checkForConflictingLocalOptions() {
    const definedNonDefaultOptions = this.options.filter((option) => {
      const optionKey = option.attributeName();
      if (this.getOptionValue(optionKey) === undefined) {
        return false;
      }
      return this.getOptionValueSource(optionKey) !== 'default';
    });

    const optionsWithConflicting = definedNonDefaultOptions.filter(
      (option) => option.conflictsWith.length > 0,
    );

    optionsWithConflicting.forEach((option) => {
      const conflictingAndDefined = definedNonDefaultOptions.find((defined) =>
        option.conflictsWith.includes(defined.attributeName()),
      );
      if (conflictingAndDefined) {
        this._conflictingOption(option, conflictingAndDefined);
      }
    });
  }
Display an error message if conflicting options are used together in this.

@private