由于用javasript的某种限制和不足，所以决定使用typescript来写eggjs

初始化typescript

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npm init egg --type=ts

使用数据库

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npm i --save egg-sequelize mysql2

/config/plugins.ts

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sequlize: {
    enable: true,
    package: 'egg-sequelize',
  },

/config/config.default.ts
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config.sequelize = {
    dialect: 'mysql',
    host: 'localhost',
    port: 3306,
    password: '123456',
    database: 'eic-egg',
    timezone: '+08:00',
  };