TypeError: this.hooks is not a function

[hhchow7]

I am using Feathers.js for the backend.

This is the original response from POST /authentication

{
    "accessToken": "XXXXX",
    "authentication": {
        "strategy": "local",
        "accessToken": "XXXXX",
        "payload": {
            "iat": 1616402936,
            "exp": 1616489336,
            "aud": "https://yourdomain.com",
            "iss": "feathers",
            "sub": "c15ef318-68fc-471c-9710-52f14d87abda",
            "jti": "57d103e1-c81b-4fc6-8bbe-952b74aaf8e3"
        }
    },
    "user": {
        "id": "c15ef320-68fc-471c-9710-52f14d87ccda",
        "email": "[email protected]",
    }
}

I want to discard the authentication field from the response, so I modified authentication.js as:

const { AuthenticationService, JWTStrategy } = require('@feathersjs/authentication');
const { LocalStrategy } = require('@feathersjs/authentication-local');
const { expressOauth } = require('@feathersjs/authentication-oauth');
const { discard, iff, isProvider, lowerCase } = require('feathers-hooks-common')

module.exports = app => {
  const authentication = new AuthenticationService(app);

  authentication.register('jwt', new JWTStrategy());
  authentication.register('local', new LocalStrategy());

  app.use('/authentication', authentication);
  app.service('/authentication').hooks({
    before: {
      create: [lowerCase('email')],
      update: [lowerCase('email')],
      patch: [lowerCase('email')],
    },
    after: {
      create: [discard('authentication')]
    }
  });
  app.configure(expressOauth());
};

Then an error occurs:

/server/node_modules/@feathersjs/authentication/lib/service.js:141

this.hooks({

^


TypeError: this.hooks is not a function

at Object.setup (/server/node_modules/@feathersjs/authentication/lib/service.js:141:14)

at /server/node_modules/@feathersjs/feathers/lib/application.js:139:17

at Array.forEach (<anonymous>)

at Function.setup [as _super] (/server/node_modules/@feathersjs/feathers/lib/application.js:133:32)

at Function.setup (/server/node_modules/@feathersjs/socketio/lib/index.js:70:30)

at Function.newMethod (/server/node_modules/uberproto/lib/proto.js:34:20)

at Function.app.setup (/server/src/sequelize.js:20:29)

at Function.listen (/server/node_modules/@feathersjs/express/lib/index.js:63:12)

at Function.newMethod (/server/node_modules/uberproto/lib/proto.js:34:20)

at Function.listen (/server/node_modules/@feathersjs/socketio/lib/index.js:39:25)

[nodemon] app crashed - waiting for file changes before starting...

What is wrong here?