The generator doesn't provides a constructor and option value doesn't pass from environment to generator

[helxsz]

I am using yeoman to build a simple generator.
my yeoman version is as followed.

    "yeoman-environment": "^3.0.0-rc.1",
    "yeoman-generator": "^5.0.0",

the following code will initialise the generator and pass the option value to it.

var yeoman = require('yeoman-environment');
var env = yeoman.createEnv();
env.register(require.resolve('./generators/index.js'), 'express');
env.run("express", {
    entityName: 'entity',
    entityFields: {'abc':1,'cde':2},
});

generator code

    module.exports = class extends Generator {
      constructor(args, opts) {
          super(args, opts);
          console.log('constructor  ',args, opts);
      }
      initializing() {
          const companyName = this.options.companyName; // shows undefined 
          const entityName = this.options.entityName;   // shows undefined 
      }
    }

however running the generator shows two problems .

1. issue 1

(node:47412) UnhandledPromiseRejectionWarning: TypeError: The generator doesn't provides a constructor.
    at Environment._findGeneratorClass (/Users/xisizhe/Documents/projects/server/modules/app-generator/server/controllers/node_modules/_yeoman-environment@3.0.1@yeoman-environment/lib/environment.js:641:13)
    at Environment.get (/Users/xisizhe/Documents/projects/server/modules/app-generator/server/controllers/node_modules/_yeoman-environment@3.0.1@yeoman-environment/lib/environment.js:598:17)
    at Environment.create (/Users/xisizhe/Documents/projects/server/modules/app-generator/server/controllers/node_modules/_yeoman-environment@3.0.1@yeoman-environment/lib/environment.js:678:35)
    at instantiateAndRun (/Users/xisizhe/Documents/projects/server/modules/app-generator/server/controllers/node_modules/_yeoman-environment@3.0.1@yeoman-environment/lib/environment.js:851:30)
    at Environment.run (/Users/xisizhe/Documents/projects/server/modules/app-generator/server/controllers/node_modules/_yeoman-environment@3.0.1@yeoman-environment/lib/environment.js:873:12)

2. issue 2

the option value didn't pass from environment to generator.

constructor(args, opts) {
super(args, opts);
console.log('constructor ',args, opts);
}

args are []

and opts are

{ sharedData: {},
  forwardErrorToEnvironment: false,
  skipLocalCache: true,
  initialGenerator: true,
  env:
   Environment {
     domain: null,
     _events: [Object: null prototype] {},
     _eventsCount: 0,
     _maxListeners: 100,
     options: {},
     adapter:
      TerminalAdapter {
        promptModule: [Function],
        console: [Console],
        log: [Function],
        tracker: [EventEmitter] },
     cwd: '/Users/asf/Documents/projects/server',
     logCwd: '/Users/asf/Documents/projects/server',
     store:
      Store {
        _generators: [Object],
        _meta: [Object],
        _packagesPaths: {},
        _packagesNS: [Array] },
     command: undefined,
     runLoop:
      Queue {
        queueNames: [Array],
        __queues__: [Object],
        runOnAdd: false,
        _maxListeners: 0 },
     sharedFs:
      Store {
        domain: null,
        _events: [Object],
        _eventsCount: 1,
        _maxListeners: 0 },
     fs: EditionInterface { store: [Store] },
     lookups: [ '.', 'generators', 'lib/generators', 'dist/generators' ],
     aliases: [ [Object] ],
     sharedOptions:
      { sharedData: {},
        forwardErrorToEnvironment: false,
        skipLocalCache: true },
     repository:
      YeomanRepository {
        log: [Function],
        tracker: [EventEmitter],
        _repositoryPath: '/Users/asf/Documents/projects/server/.yo-repository',
        _nodeModulesPath:
         '/Users/asf/Documents/projects/server/.yo-repository/node_modules' },
     _generators: {} },
  resolved:
   '/Users/asf/Documents/projects/server/modules/app-generator/server/controllers/generators/app/index.js',
  namespace: 'express',
  _: [],
  help: undefined,
  h: undefined,
  'skip-cache': false,
  'skip-install': false,
  'force-install': false,
  'ask-answered': false }

I don't know why, I have the constructor function in the code and this constructor function did execute to print out