How to use the oni-save-parser.getHashedString function in oni-save-parser

function aptitudeValue(
  aptitudes: [HashedString, number][],
  aptitudeName: string
): number {
  const hash = getHashedString(aptitudeName).hash;
  const aptitude = find(aptitudes, x => x[0].hash === hash);
  if (!aptitude) {
    return 0;
  }
  return aptitude[1];
}

function removeAptitude(aptitudeName: string) {
    const hashStr = getHashedString(aptitudeName);
    const index = findIndex(
      AptitudeBySkillGroup,
      x => x[0].hash === hashStr.hash
    );
    if (index === -1) {
      return;
    }
    onTemplateDataModify({
      AptitudeBySkillGroup: [
        ...AptitudeBySkillGroup.slice(0, index),
        ...AptitudeBySkillGroup.slice(index + 1)
      ]
    });
  }