if (type === 'COLON' && !(/:$/u).test(preceedingSubfield.value)) { // eslint-disable-line functional/no-conditional-statements
          const nextValue = `${preceedingSubfield.value} :`;
          debug(`Updated subfield ${preceedingSubfield.code} from '${preceedingSubfield.value}' to '${nextValue}'`);
          preceedingSubfield.value = nextValue; // eslint-disable-line functional/immutable-data
        }