如何解决 nest.js 中的 DI 问题？

Question

我想了解如何通过 DI 在 nestjs 中导入 3rd 方库。所以，我有一个 class AuthService:

export class AuthService {
   constructor(
     @Inject(constants.JWT) private jsonWebToken: any,
   ){}
  ....
}

JWT 提供商：

import * as jwt from 'jsonwebtoken';
import {Module} from '@nestjs/common';
import constants from '../../../constants';

const jwtProvider = {
  provide: constants.JWT,
  useValue: jwt,
};

@Module({
  components: [jwtProvider],
})
export class JWTProvider {}

库模块：

import { Module } from '@nestjs/common';
import {BcryptProvider} from './bcrypt/bcrypt.provider';
import {JWTProvider} from './jsonwebtoken/jwt.provider';

@Module({
  components: [
    BcryptProvider,
    JWTProvider,
  ],
  controllers: [],
  exports: [
    BcryptProvider,
    JWTProvider,
  ],
})
export class LibrariesModule{
}

我收到这个错误：

Error: Nest can't resolve dependencies of the AuthService (?). Please verify whether [0] argument is available in the current context.
    at Injector.<anonymous> (D:\Learning\nest\project\node_modules\@nestjs\core\injector\injector.js:156:23)
    at Generator.next (<anonymous>)
    at fulfilled (D:\Learning\nest\project\node_modules\@nestjs\core\injector\injector.js:4:58)
    at <anonymous>
    at process._tickCallback (internal/process/next_tick.js:188:7)

此外，我想听听一些关于不在 jsonWebToken 变量中使用类型 any 的建议。

Answer 1

细节决定成败。你可以 "import" 其他模块进入 AuthModule 像这样：

@Module({
  modules: [LibrariesModule], // <= added this line
  components: [AuthService, JwtStrategy],
  controllers: [],
})
export class AuthModule {

}

来源：here

第二题还没开

如何解决 nest.js 中的 DI 问题？

How to resolve DI issue in nest.js?

node.js

typescript

dependency-injection

nestjs