更新

/**
 * Keep this file in sync with the code in the "Usage" section
 * in /docs/manual/other-topics/typescript.md
 *
 * Don't include this comment in the md file.
 */
import {
  Association, DataTypes, HasManyAddAssociationMixin, HasManyCountAssociationsMixin,
  HasManyCreateAssociationMixin, HasManyGetAssociationsMixin, HasManyHasAssociationMixin,
  HasManySetAssociationsMixin, HasManyAddAssociationsMixin, HasManyHasAssociationsMixin,
  HasManyRemoveAssociationMixin, HasManyRemoveAssociationsMixin, Model, ModelDefined, Optional,
  Sequelize, InferAttributes, InferCreationAttributes, CreationOptional, NonAttribute, ForeignKey,
} from 'sequelize';

const sequelize = new Sequelize('mysql://root:asd123@localhost:3306/mydb');

// 'projects' is excluded as it's not an attribute, it's an association.
class User extends Model<InferAttributes<User, { omit: 'projects' }>, InferCreationAttributes<User, { omit: 'projects' }>> {
  // id can be undefined during creation when using `autoIncrement`
  declare id: CreationOptional<number>;
  declare name: string;
  declare preferredName: string | null; // for nullable fields

  // timestamps!
  // createdAt can be undefined during creation
  declare createdAt: CreationOptional<Date>;
  // updatedAt can be undefined during creation
  declare updatedAt: CreationOptional<Date>;

  // Since TS cannot determine model association at compile time
  // we have to declare them here purely virtually
  // these will not exist until `Model.init` was called.
  declare getProjects: HasManyGetAssociationsMixin<Project>; // Note the null assertions!
  declare addProject: HasManyAddAssociationMixin<Project, number>;
  declare addProjects: HasManyAddAssociationsMixin<Project, number>;
  declare setProjects: HasManySetAssociationsMixin<Project, number>;
  declare removeProject: HasManyRemoveAssociationMixin<Project, number>;
  declare removeProjects: HasManyRemoveAssociationsMixin<Project, number>;
  declare hasProject: HasManyHasAssociationMixin<Project, number>;
  declare hasProjects: HasManyHasAssociationsMixin<Project, number>;
  declare countProjects: HasManyCountAssociationsMixin;
  declare createProject: HasManyCreateAssociationMixin<Project, 'ownerId'>;

  // You can also pre-declare possible inclusions, these will only be populated if you
  // actively include a relation.
  declare projects?: NonAttribute<Project[]>; // Note this is optional since it's only populated when explicitly requested in code

  // getters that are not attributes should be tagged using NonAttribute
  // to remove them from the model's Attribute Typings.
  get fullName(): NonAttribute<string> {
    return this.name;
  }

  declare static associations: {
    projects: Association<User, Project>;
  };
}

class Project extends Model<
  InferAttributes<Project>,
  InferCreationAttributes<Project>
> {
  // id can be undefined during creation when using `autoIncrement`
  declare id: CreationOptional<number>;

  // foreign keys are automatically added by associations methods (like Project.belongsTo)
  // by branding them using the `ForeignKey` type, `Project.init` will know it does not need to
  // display an error if ownerId is missing.
  declare ownerId: ForeignKey<User['id']>;
  declare name: string;

  // `owner` is an eagerly-loaded association.
  // We tag it as `NonAttribute`
  declare owner?: NonAttribute<User>;

  // createdAt can be undefined during creation
  declare createdAt: CreationOptional<Date>;
  // updatedAt can be undefined during creation
  declare updatedAt: CreationOptional<Date>;
}

class Address extends Model<
  InferAttributes<Address>,
  InferCreationAttributes<Address>
> {
  declare userId: ForeignKey<User['id']>;
  declare address: string;

  // createdAt can be undefined during creation
  declare createdAt: CreationOptional<Date>;
  // updatedAt can be undefined during creation
  declare updatedAt: CreationOptional<Date>;
}

Project.init(
  {
    id: {
      type: DataTypes.INTEGER.UNSIGNED,
      autoIncrement: true,
      primaryKey: true
    },
    name: {
      type: new DataTypes.STRING(128),
      allowNull: false
    },
    createdAt: DataTypes.DATE,
    updatedAt: DataTypes.DATE,
  },
  {
    sequelize,
    tableName: 'projects'
  }
);

User.init(
  {
    id: {
      type: DataTypes.INTEGER.UNSIGNED,
      autoIncrement: true,
      primaryKey: true
    },
    name: {
      type: new DataTypes.STRING(128),
      allowNull: false
    },
    preferredName: {
      type: new DataTypes.STRING(128),
      allowNull: true
    },
    createdAt: DataTypes.DATE,
    updatedAt: DataTypes.DATE,
  },
  {
    tableName: 'users',
    sequelize // passing the `sequelize` instance is required
  }
);

Address.init(
  {
    address: {
      type: new DataTypes.STRING(128),
      allowNull: false
    },
    createdAt: DataTypes.DATE,
    updatedAt: DataTypes.DATE,
  },
  {
    tableName: 'address',
    sequelize // passing the `sequelize` instance is required
  }
);

// You can also define modules in a functional way
interface NoteAttributes {
  id: number;
  title: string;
  content: string;
}

// You can also set multiple attributes optional at once
type NoteCreationAttributes = Optional<NoteAttributes, 'id' | 'title'>;

// And with a functional approach defining a module looks like this
const Note: ModelDefined<
  NoteAttributes,
  NoteCreationAttributes
> = sequelize.define(
  'Note',
  {
    id: {
      type: DataTypes.INTEGER.UNSIGNED,
      autoIncrement: true,
      primaryKey: true
    },
    title: {
      type: new DataTypes.STRING(64),
      defaultValue: 'Unnamed Note'
    },
    content: {
      type: new DataTypes.STRING(4096),
      allowNull: false
    }
  },
  {
    tableName: 'notes'
  }
);

// Here we associate which actually populates out pre-declared `association` static and other methods.
User.hasMany(Project, {
  sourceKey: 'id',
  foreignKey: 'ownerId',
  as: 'projects' // this determines the name in `associations`!
});

Address.belongsTo(User, { targetKey: 'id' });
User.hasOne(Address, { sourceKey: 'id' });

async function doStuffWithUser() {
  const newUser = await User.create({
    name: 'Johnny',
    preferredName: 'John',
  });
  console.log(newUser.id, newUser.name, newUser.preferredName);

  const project = await newUser.createProject({
    name: 'first!'
  });

  const ourUser = await User.findByPk(1, {
    include: [User.associations.projects],
    rejectOnEmpty: true // Specifying true here removes `null` from the return type!
  });

  // Note the `!` null assertion since TS can't know if we included
  // the model or not
  console.log(ourUser.projects![0].name);
}

(async () => {
  await sequelize.sync();
  await doStuffWithUser();
})();

旧版

使用Decorators是你应该尽可能避免的，它们不是ECMAScript标准。他们甚至被认为是遗产。这就是为什么我要向你展示如何使用sequelize和typescript。
我们只需要遵循文档：https://sequelize.org/v5/manual/typescript.html，但它不是很清楚，或至少对我来说。我花了一段时间才明白。
上面写着你需要安装这些树的东西

* @types/node
 * @types/validator // this one is not need it
 * @types/bluebird

npm i -D @types/node @types/bluebird
假设你的项目看起来像这样：

myProject
--src
----models
------index.ts
------user-model.ts
------other-model.ts
----controllers
----index.ts
--package.json

让我们先创建用户模型

`./src/models/user-model.ts`
import { BuildOptions, DataTypes, Model, Sequelize } from "sequelize";

export interface UserAttributes {
    id: number;
    name: string;
    email: string;
    createdAt?: Date;
    updatedAt?: Date;
}
export interface UserModel extends Model<UserAttributes>, UserAttributes {}
export class User extends Model<UserModel, UserAttributes> {}

export type UserStatic = typeof Model & {
    new (values?: object, options?: BuildOptions): UserModel;
};

export function UserFactory (sequelize: Sequelize): UserStatic {
    return <UserStatic>sequelize.define("users", {
        id: {
            type: DataTypes.INTEGER,
            autoIncrement: true,
            primaryKey: true,
        },
        email: {
            type: DataTypes.STRING,
            allowNull: false,
            unique: true,
        },
        name: {
            type: DataTypes.STRING,
            allowNull: false,
        },
        createdAt: {
            type: DataTypes.DATE,
            allowNull: false,
            defaultValue: DataTypes.NOW,
        },
        updatedAt: {
            type: DataTypes.DATE,
            allowNull: false,
            defaultValue: DataTypes.NOW,
        },
    });
}

现在为了玩箭头，让我们创建另一个-model.ts

`./src/models/another-model.ts`

import { BuildOptions, DataTypes, Model, Sequelize } from "sequelize";

export interface SkillsAttributes {
    id: number;
    skill: string;
    createdAt?: Date;
    updatedAt?: Date;
}
export interface SkillsModel extends Model<SkillsAttributes>, SkillsAttributes {}
export class Skills extends Model<SkillsModel, SkillsAttributes> {}

export type SkillsStatic = typeof Model & {
    new (values?: object, options?: BuildOptions): SkillsModel;
};

export function SkillsFactory (sequelize: Sequelize): SkillsStatic {
    return <SkillsStatic>sequelize.define("skills", {
        id: {
            type: DataTypes.INTEGER,
            autoIncrement: true,
            primaryKey: true,
        },
        skill: {
            type: DataTypes.STRING,
            allowNull: false,
            unique: true,
        },
        createdAt: {
            type: DataTypes.DATE,
            allowNull: false,
            defaultValue: DataTypes.NOW,
        },
        updatedAt: {
            type: DataTypes.DATE,
            allowNull: false,
            defaultValue: DataTypes.NOW,
        },
    });
}

我们的实体完成了。现在是DB连接。
打开./src/models/index.ts，这里是我们要放置seqelize示例的地方

`./src/models/index.ts`

import * as sequelize from "sequelize";
import {userFactory} from "./user-model";
import {skillsFactory} from "./other-model";

export const dbConfig = new sequelize.Sequelize(
    (process.env.DB_NAME = "db-name"),
    (process.env.DB_USER = "db-user"),
    (process.env.DB_PASSWORD = "db-password"),
    {
        port: Number(process.env.DB_PORT) || 54320,
        host: process.env.DB_HOST || "localhost",
        dialect: "postgres",
        pool: {
            min: 0,
            max: 5,
            acquire: 30000,
            idle: 10000,
        },
    }
);

// SOMETHING VERY IMPORTANT them Factory functions expect a
// sequelize instance as parameter give them `dbConfig`

export const User = userFactory(dbConfig);
export const Skills = skillsFactory(dbConfig);

// Users have skills then lets create that relationship

User.hasMay(Skills);

// or instead of that, maybe many users have many skills
Skills.belongsToMany(Users, { through: "users_have_skills" });

// the skill is the limit!

在我们的index.ts添加，如果你只是想打开连接

db.sequelize
        .authenticate()
        .then(() => logger.info("connected to db"))
        .catch(() => {
            throw "error";
        });

或者如果你想创建这些表

db.sequelize
        .sync()
        .then(() => logger.info("connected to db"))
        .catch(() => {
            throw "error";
        });

有些像这样

import * as bodyParser from "body-parser";
import * as express from "express";
import { dbConfig } from "./models";
import { routes } from "./routes";
import { logger } from "./utils/logger";
import { timeMiddleware } from "./utils/middlewares";

export function expressApp () {
    dbConfig
        .authenticate()
        .then(() => logger.info("connected to db"))
        .catch(() => {
            throw "error";
        });

    const app: Application = express();
    if (process.env.NODE_ENV === "production") {
        app.use(require("helmet")());
        app.use(require("compression")());
    } else {
        app.use(require("cors")());
    }

    app.use(bodyParser.json());
    app.use(bodyParser.urlencoded({ extended: true, limit: "5m" }));
    app.use(timeMiddleware);
    app.use("/", routes(db));

    return app;
}

天空又是极限。如果你这样做，你将拥有自动完成的所有功能。这里是一个例子：https://github.com/EnetoJara/resume-app

使用sequelize-typescript。将表和视图转换为扩展Model对象的类。
在类中使用注解来定义表。

import {Table, Column, Model, HasMany} from 'sequelize-typescript';
 
@Table
class Person extends Model<Person> {
 
  @Column
  name: string;
 
  @Column
  birthday: Date;
 
  @HasMany(() => Hobby)
  hobbies: Hobby[];
}

通过创建对象创建到DB的连接：

const sequelize = new Sequelize(configuration...).

然后将表注册到此对象。

sequelize.add([Person])

如需进一步参考，请检查此模块。Sequelize-Typescript

我建议缩短你的打字时间，做一些类似这样的事情：

interface UserAttributes extends Model {
    id: number;
    name: string;
    email: string;
    createdAt?: Date;
    updatedAt?: Date;
}