bcrypt como servicio y login operador listo

src/bcrypt/bcrypt.module.ts

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+import { Module } from '@nestjs/common';
+import { BcryptService } from './bcrypt.service';
+
+@Module({
+  providers: [BcryptService],
+  exports: [BcryptService],
+})
+export class BcryptModule {}

src/bcrypt/bcrypt.service.spec.ts

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+import { Test, TestingModule } from '@nestjs/testing';
+import { BcryptService } from './bcrypt.service';
+
+describe('BcryptService', () => {
+  let service: BcryptService;
+
+  beforeEach(async () => {
+    const module: TestingModule = await Test.createTestingModule({
+      providers: [BcryptService],
+    }).compile();
+
+    service = module.get<BcryptService>(BcryptService);
+  });
+
+  it('should be defined', () => {
+    expect(service).toBeDefined();
+  });
+});

src/bcrypt/bcrypt.service.ts

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+import { Injectable } from '@nestjs/common';
+import { ConfigService } from '@nestjs/config';
+import * as bcrypt from 'bcrypt';
+
+@Injectable()
+export class BcryptService {
+  constructor(private configService: ConfigService) {}
+
+  encriptar(password: string) {
+    const salt = bcrypt.genSaltSync(
+      Number(this.configService.get<string>('SALT_ROUNDS')),
+    );
+
+    return bcrypt.hashSync(password, salt);
+  }
+
+  comparar(password: string, passwordDb: string) {
+    return bcrypt.compareSync(password, passwordDb);
+  }
+}