box-nestjs-monorepo/libs/db/src/redis/redis.module.ts

// libs/db/src/redis/redis.module.ts
import { DynamicModule, Module, Provider } from '@nestjs/common';
import Redis from 'ioredis';
import { REDIS_CLIENT, REDIS_OPTIONS } from './redis.constants';
import {
  RedisModuleAsyncOptions,
  RedisModuleOptions,
} from './redis.interfaces';
import { RedisService } from './redis.service';

@Module({})
export class RedisModule {
  static forRootAsync(options: RedisModuleAsyncOptions): DynamicModule {
    const optionsProvider: Provider = {
      provide: REDIS_OPTIONS,
      useFactory: options.useFactory,
      inject: options.inject ?? [],
    };

    const clientProvider: Provider = {
      provide: REDIS_CLIENT,
      useFactory: async (opts: RedisModuleOptions) => {
        const client = new Redis({
          host: opts.host,
          port: opts.port,
          password: opts.password || undefined,
          db: opts.db ?? 0,
          keyPrefix: opts.keyPrefix,
          tls: opts.tls ? {} : undefined,
        });

        client.on('error', (err) => {
          // eslint-disable-next-line no-console
          console.error('[Redis] Error:', err?.message ?? err);
        });

        return client;
      },
      inject: [REDIS_OPTIONS],
    };

    return {
      module: RedisModule,
      global: true, // Make it globally available
      imports: options.imports ?? [],
      providers: [optionsProvider, clientProvider, RedisService],
      exports: [clientProvider, RedisService], // 👈 important
    };
  }
}