Please need your help . 
Why i got the strange error for String(150) in nickname object ? 

```
const Sequelize = require('sequelize');
const devOptions = require('./../config/config').connectionConf.development;

const sequelize = new Sequelize(
  devOptions.database,
  devOptions.username,
  devOptions.password,
  {
    host: devOptions.host,
    dialect: devOptions.dialect
  }
);

const User = sequelize.define('user', {
    user_id: {
      primaryKey:true,
      type:sequelize.BIGINT,
      allowNull:false 
   },
    nickname: {
      type:sequelize.STRING(150),
      unique:true,
      allowNull:false
    },
    email: {
      type:sequelize.STRING(150),
      unique:true,
      allowNull:false
    },
    user_password: {
      type:sequelize.STRING(150),
      unique:true,
      allowNull:false
    },
    created_at: {
      type:sequelize.Date,
      created_time:sequelize.NOW,
      allowNull:false
    },
    updated_at: {
      type:sequelize.Date,
      allowNull:false
    }
  }, {});

```

> 
> 
> > 
> > TypeError: sequelize.STRING is not a function
> >  at Object. (E:\Projects\JavaScript\couponsystem\src\models\schema.js:21:22)
> >  at Module.\_compile (internal/modules/cjs/loader.js:688:30)
> >  at Object.Module.\_extensions..js (internal/modules/cjs/loader.js:699:10)
> >  at Module.load (internal/modules/cjs/loader.js:598:32)
> >  at tryModuleLoad (internal/modules/cjs/loader.js:537:12)
> >  at Function.Module.\_load (internal/modules/cjs/loader.js:529:3)
> >  at Module.require (internal/modules/cjs/loader.js:636:17)
> >  at require (internal/modules/cjs/helpers.js:20:18)
> >  at Object. (E:\Projects\JavaScript\couponsystem\src\models\generator.js:1:78)
> >  at Module.\_compile (internal/modules/cjs/loader.js:688:30)
> >  at Object.Module.\_extensions..js (internal/modules/cjs/loader.js:699:10)
> >  at Module.load (internal/modules/cjs/loader.js:598:32)
> >  at tryModuleLoad (internal/modules/cjs/loader.js:537:12)
> >  at Function.Module.\_load (internal/modules/cjs/loader.js:529:3)
> >  at Function.Module.runMain (internal/modules/cjs/loader.js:741:12)
> >  at startup (internal/bootstrap/node.js:285:19)
> >  at bootstrapNodeJSCore (internal/bootstrap/node.js:739:3)
> > 
> > 
> > 
> 
> 
>