planka/server/api/helpers/users/get-one.js

const criteriaValidator = (value) => _.isString(value) || _.isPlainObject(value);

module.exports = {
  inputs: {
    criteria: {
      type: 'json',
      custom: criteriaValidator,
      required: true,
    },
    withDeleted: {
      type: 'boolean',
      defaultsTo: false,
    },
  },

  async fn(inputs) {
    const criteria = {};

    if (_.isString(inputs.criteria)) {
      criteria.id = inputs.criteria;
    } else if (_.isPlainObject(inputs.criteria)) {
      Object.assign(criteria, inputs.criteria);
    }

    if (!inputs.withDeleted) {
      criteria.deletedAt = null;
    }

    return User.findOne(criteria);
  },
};