old_contents: const { BadRequest } = require('@feathersjs/errors');
  
  const userDataFilter = user => ({
  	userId: user._id,
  	email: user.email,
  	firstName: user.firstName,
  	lastName: user.lastName,
  	importHash: user.importHash,
  	schoolId: user.schoolId,
  	birthday: user.birthday,
  });
  
  class UserLinkImportService {
  	constructor(userService) {
  		this.userService = userService;
  		this.docs = {};
  	}
  
  	get(hash) { // can not use get becouse the hash can have / that mapped to non existing routes
  		return this.userService.find({ query: { importHash: hash } })
  			.then((users) => {
  				if (users.data.length !== 1) {
  					throw new BadRequest('Can not match the hash.');
  				}
  				return userDataFilter(users.data[0]);
  			}).catch(err => err);
  	}
  }
  
  module.exports = UserLinkImportService;
  
new_contents: const { BadRequest } = require('@feathersjs/errors');
  
  const userDataFilter = user => ({
  	userId: user._id,
  	email: user.email,
  	firstName: user.firstName,
  	lastName: user.lastName,
  	importHash: user.importHash,
  	schoolId: user.schoolId,
  	birthday: user.birthday,
  });
  
  class UserLinkImportService {
  	constructor(userService) {
  		this.userService = userService;
  		this.docs = {};
  	}
  
  	get(hash) { // can not use get becouse the hash can have / that mapped to non existing routes
  		return this.userService.find({ query: { importHash: hash } })
  			.then((users) => {
  				if (users.data.length !== 1) {
  					throw new BadRequest('Can not match the hash.');
  				}
  				return userDataFilter(users.data[0]);
  			}).catch(err => err);
  	}
  
  	setup(app) {
  		this.app = app;
  	}
  }
  
  module.exports = UserLinkImportService;
  
subject: Add missing setup in class.