api.pawol.nu/api/slugs/controllers/slugs.js

module.exports = {
  index: async ctx => {
      const result = await strapi
          .query('teks')
          .model.find({published_at: {$ne: null}})
      const sortedResult = result.sort((a, b) => {
        const aDate = new Date(a.published_at)
        const bDate = new Date(b.published_at)
        return bDate.getTime() - aDate.getTime()
      })
      ctx.send(sortedResult.map(({slug}) => slug));
  }
}