vault-frontend/src/utils/tag.ts

import { ITag } from '~/redux/types';

export const separateTags = (tags: Partial<ITag>[]): Partial<ITag>[][] =>
  (tags || []).reduce(
    (obj, tag) =>
      tag.title.substr(0, 1) === '/' ? [[...obj[0], tag], obj[1]] : [obj[0], [...obj[1], tag]],
    [[], []]
  );

export const separateTagOptions = (options: string[]): string[][] =>
  separateTags(options.map((title): Partial<ITag> => ({ title }))).map(item =>
    item.map(({ title }) => title)
  );