在 Typescript 中，如何创建可以在由类型参数定义的模型上调用静态方法的通用服务

Question

I want to do something like this:

import {Company} from 'company.model.ts'

@Service()
export class CompanyService extends BaseService<Company> {
  constructor() {
    super()
    this.Model = Company
  }
}

@Service()
export class BaseService<T extends typeof Model> {
  Model: typeof T
  async findAll(input) {
    return await this.Model.create(input)
  }
}

I want to call static methods on a class with a type of typeof T .

Also, is there a way to avoid having to assign a typeof T to an instance variable?

Answer 1

Solution is to use:

Model: {new(): T} & typeof Sequelize.Model

Thanks to: https://github.com/RobinBuschmann/sequelize-typescript/issues/231#issuecomment-471724824