Custom injecting logic for NestJS with support multi providing

npm i --save nestjs-custom-injector

export const ANIMAL_PROVIDER = 'ANIMAL_PROVIDER';export interface AnimalProviderInteface {  type: string;  say(): string;}

import { Injectable } from '@nestjs/common';import { AnimalProviderInteface } from './animal-provider.interface';@Injectable()export class AnimalCatsService implements AnimalProviderInteface {  type = 'cat';  say(): string {    return 'meow';  }}

import { Injectable } from '@nestjs/common';import { AnimalProviderInteface } from './animal-provider.interface';@Injectable()export class AnimalDogsService implements AnimalProviderInteface {  type = 'dog';  say(): string {    return 'woof';  }}

import { Controller, Get, Query } from '@nestjs/common';import { CustomInject } from 'nestjs-custom-injector';import {  AnimalProviderInteface,  ANIMAL_PROVIDER,} from './animal-provider.interface';@Controller('animals')export class AnimalsController {  @CustomInject(ANIMAL_PROVIDER, { multi: true })  private animalProviders!: AnimalProviderInteface[];  @Get('animal-types')  animalTypes() {    return this.animalProviders.map((animalProvider) => animalProvider.type);  }  @Get('what-says-animals')  whatSaysAnimals() {    return this.animalProviders.map(      (animal) => `${animal.type} say ${animal.say()}`    );  }  @Get('who-say')  whoSay(@Query('voice') voice: string) {    const animal = this.animalProviders.find(      (animal) => animal.say() === voice    );    if (!animal) {      return { error: `I don't know who say ${voice}` };    }    return `${animal.type} say ${animal.say()}`;  }}

import { Module } from '@nestjs/common';import { CustomInjectorModule } from 'nestjs-custom-injector';import { AnimalCatsService } from './animal-cats.service';import { AnimalDogsService } from './animal-dogs.service';import { AnimalsController } from './animals.controller';@Module({  ...  imports: [    ...    CustomInjectorModule.forRoot(),    CustomInjectorModule.forFeature({      providers: [{ provide: ANIMAL_PROVIDER, useClass: AnimalCatsService }],    }),    CustomInjectorModule.forFeature({      providers: [        { provide: ANIMAL_PROVIDER, useValue: new AnimalDogsService() },      ],    }),    ...  ],  controllers: [    ...    AnimalsController    ...  ]  ...})export class AppModule {}