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feat(sample): add hmr with esm example#16078

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feat(sample): add hmr with esm example#14331
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@shash-hq
shash-hq committedDec 15, 2025
commit6a2636925da3093dceb1c1cbf61a0cd04577ac12
18 changes: 18 additions & 0 deletionssample/36-hmr-esm/.gitignore
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# dependencies
/node_modules

# IDE
/.idea
/.awcache
/.vscode

# misc
npm-debug.log

# tests
/test
/coverage
/.nyc_output

# dist
/dist
34 changes: 34 additions & 0 deletionssample/36-hmr-esm/e2e/cats/cats.e2e-spec.ts
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import { INestApplication } from '@nestjs/common';
import { Test } from '@nestjs/testing';
import * as request from 'supertest';
import { CatsModule } from '../../src/cats/cats.module';
import { CatsService } from '../../src/cats/cats.service';
import { CoreModule } from '../../src/core/core.module';

describe('Cats', () => {
const catsService = { findAll: () => ['test'] };

let app: INestApplication;

beforeAll(async () => {
const moduleRef = await Test.createTestingModule({
imports: [CatsModule, CoreModule],
})
.overrideProvider(CatsService)
.useValue(catsService)
.compile();

app = moduleRef.createNestApplication();
await app.init();
});

it(`/GET cats`, () => {
return request(app.getHttpServer()).get('/cats').expect(200).expect({
data: catsService.findAll(),
});
});

afterAll(async () => {
await app.close();
});
});
14 changes: 14 additions & 0 deletionssample/36-hmr-esm/e2e/jest-e2e.json
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{
"moduleFileExtensions": [
"ts",
"tsx",
"js",
"json"
],
"transform": {
"^.+\\.tsx?$": "ts-jest"
},
"testRegex": "/e2e/.*\\.(e2e-test|e2e-spec).(ts|tsx|js)$",
"collectCoverageFrom" : ["src/**/*.{js,jsx,tsx,ts}", "!**/node_modules/**", "!**/vendor/**"],
"coverageReporters": ["json", "lcov"]
}
42 changes: 42 additions & 0 deletionssample/36-hmr-esm/eslint.config.mjs
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// @ts-check
import eslint from '@eslint/js';
import eslintPluginPrettierRecommended from 'eslint-plugin-prettier/recommended';
import globals from 'globals';
import tseslint from 'typescript-eslint';

export default tseslint.config(
{
ignores: ['eslint.config.mjs'],
},
eslint.configs.recommended,
...tseslint.configs.recommendedTypeChecked,
eslintPluginPrettierRecommended,
{
languageOptions: {
globals: {
...globals.node,
...globals.jest,
},
ecmaVersion: 5,
sourceType: 'module',
parserOptions: {
projectService: true,
tsconfigRootDir: import.meta.dirname,
},
},
},
{
rules: {
'@typescript-eslint/no-explicit-any': 'off',
'@typescript-eslint/no-floating-promises': 'off',
'@typescript-eslint/no-unsafe-argument': 'warn',
'@typescript-eslint/ban-ts-comment': 'off',
'@typescript-eslint/no-unsafe-return': 'off',
'@typescript-eslint/no-unsafe-assignment': 'warn',
'@typescript-eslint/no-unsafe-call': 'warn',
'@typescript-eslint/no-unsafe-member-access': 'warn',
'@typescript-eslint/require-await': 'warn',
'@typescript-eslint/no-unused-vars': 'warn',
},
},
);
14 changes: 14 additions & 0 deletionssample/36-hmr-esm/jest.json
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{
"moduleFileExtensions": [
"ts",
"tsx",
"js",
"json"
],
"transform": {
"^.+\\.tsx?$": "ts-jest"
},
"testRegex": "/src/.*\\.(test|spec).(ts|tsx|js)$",
"collectCoverageFrom" : ["src/**/*.{js,jsx,tsx,ts}", "!**/node_modules/**", "!**/vendor/**"],
"coverageReporters": ["json", "lcov"]
}
77 changes: 77 additions & 0 deletionssample/36-hmr-esm/package.json
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{
"name": "nest-typescript-starter",
"version": "1.0.0",
"description": "Nest TypeScript starter repository",
"type": "module",
"license": "MIT",
"scripts": {
"prebuild": "rimraf dist",
"build": "nest build",
"format": "prettier --write \"src/**/*.ts\" \"test/**/*.ts\"",
"start": "nest start",
"start:dev": "nest start --watch",
"start:debug": "nest start --debug --watch",
"start:dev:hmr": "nest build --webpack --webpackPath webpack-hmr.config.cjs --watch",
"start:prod": "node dist/main",
"lint": "eslint '{src,apps,libs,test}/**/*.ts' --fix",
"test": "jest",
"test:watch": "jest --watch",
"test:cov": "jest --coverage",
"test:debug": "node --inspect-brk -r tsconfig-paths/register -r ts-node/register node_modules/.bin/jest --runInBand",
"test:e2e": "jest --config ./e2e/jest-e2e.json"
},
"dependencies": {
"@nestjs/common": "11.1.9",
"@nestjs/core": "11.1.9",
"@nestjs/platform-express": "11.1.9",
"class-transformer": "0.5.1",
"class-validator": "0.14.3",
"reflect-metadata": "0.2.2",
"rimraf": "6.1.2",
"rxjs": "7.8.2"
},
"devDependencies": {
"run-script-webpack-plugin": "0.2.0",
"webpack": "5.97.1",
"webpack-node-externals": "3.0.0",
"@eslint/eslintrc": "3.3.3",
"@eslint/js": "9.39.2",
"@nestjs/cli": "11.0.14",
"@nestjs/schematics": "11.0.9",
"@nestjs/testing": "11.1.9",
"@types/express": "5.0.6",
"@types/jest": "30.0.0",
"@types/node": "24.10.3",
"@types/supertest": "6.0.3",
"@types/webpack-env": "1.18.5",
"jest": "30.2.0",
"prettier": "3.7.4",
"supertest": "7.1.4",
"ts-jest": "29.4.6",
"ts-loader": "9.5.4",
"ts-node": "10.9.2",
"tsconfig-paths": "4.2.0",
"eslint": "9.39.2",
"eslint-plugin-prettier": "5.5.4",
"globals": "16.5.0",
"typescript": "5.9.3",
"typescript-eslint": "8.49.0"
},
"jest": {
"moduleFileExtensions": [
"js",
"json",
"ts"
],
"rootDir": "src",
"testRegex": ".*\\.spec\\.ts$",
"transform": {
"^.+\\.(t|j)s$": "ts-jest"
},
"collectCoverageFrom": [
"**/*.(t|j)s"
],
"coverageDirectory": "../coverage",
"testEnvironment": "node"
}
}
8 changes: 8 additions & 0 deletionssample/36-hmr-esm/src/app.module.ts
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import { Module } from '@nestjs/common';
import { CatsModule } from './cats/cats.module';
import { CoreModule } from './core/core.module';

@Module({
imports: [CoreModule, CatsModule],
})
export class AppModule {}
54 changes: 54 additions & 0 deletionssample/36-hmr-esm/src/cats/cats.controller.spec.ts
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import { Test } from '@nestjs/testing';
import { CatsController } from './cats.controller';
import { CatsService } from './cats.service';
import { Cat } from './interfaces/cat.interface';

describe('CatsController', () => {
let catsController: CatsController;
let catsService: CatsService;

beforeEach(async () => {
const moduleRef = await Test.createTestingModule({
controllers: [CatsController],
providers: [CatsService],
}).compile();

catsService = moduleRef.get<CatsService>(CatsService);
catsController = moduleRef.get<CatsController>(CatsController);
});

describe('findAll', () => {
it('should return an array of cats', async () => {
const cats: Cat[] = [
{
age: 2,
breed: 'Bombay',
name: 'Pixel',
},
];
// @ts-ignore
catsService.cats = cats;

expect(await catsController.findAll()).toBe(cats);
});
});

describe('create', () => {
it('should add a new cat', async () => {
const cat: Cat = {
age: 2,
breed: 'Bombay',
name: 'Pixel',
};
const expectedCatArray = [cat];

// @ts-ignore
expect(catsService.cats).toStrictEqual([]);

await catsController.create(cat);

// @ts-ignore
expect(catsService.cats).toStrictEqual(expectedCatArray);
});
});
});
33 changes: 33 additions & 0 deletionssample/36-hmr-esm/src/cats/cats.controller.ts
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import { Body, Controller, Get, Param, Post, UseGuards } from '@nestjs/common';
import { Roles } from '../common/decorators/roles.decorator';
import { RolesGuard } from '../common/guards/roles.guard';
import { ParseIntPipe } from '../common/pipes/parse-int.pipe';
import { CatsService } from './cats.service';
import { CreateCatDto } from './dto/create-cat.dto';
import { Cat } from './interfaces/cat.interface';

@UseGuards(RolesGuard)
@Controller('cats')
export class CatsController {
constructor(private readonly catsService: CatsService) {}

@Post()
@Roles(['admin'])
async create(@Body() createCatDto: CreateCatDto) {
this.catsService.create(createCatDto);
}

@Get()
async findAll(): Promise<Cat[]> {
return this.catsService.findAll();
}

@Get(':id')
findOne(
@Param('id', new ParseIntPipe())
id: number,
) {
// Retrieve a Cat instance by ID
console.log(id);
}
}
9 changes: 9 additions & 0 deletionssample/36-hmr-esm/src/cats/cats.module.ts
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import { Module } from '@nestjs/common';
import { CatsController } from './cats.controller';
import { CatsService } from './cats.service';

@Module({
controllers: [CatsController],
providers: [CatsService],
})
export class CatsModule {}
48 changes: 48 additions & 0 deletionssample/36-hmr-esm/src/cats/cats.service.spec.ts
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import { Test } from '@nestjs/testing';
import { CatsService } from './cats.service';
import { Cat } from './interfaces/cat.interface';

describe('CatsService', () => {
let catsService: CatsService;

beforeEach(async () => {
const moduleRef = await Test.createTestingModule({
providers: [CatsService],
}).compile();

catsService = moduleRef.get<CatsService>(CatsService);
});

describe('findAll', () => {
it('should return an array of cats', async () => {
const result = [
{
name: 'Frajola',
age: 2,
breed: 'Stray',
},
];
//@ts-ignore
catsService.cats = result;

await expect(catsService.findAll()).resolves.toBe(result);
});
});

describe('create', () => {
it('should add a new cat', async () => {
const cat: Cat = {
name: 'Frajola',
age: 2,
breed: 'Stray',
};
const expectedCatArray = [cat];
//@ts-ignore
expect(catsService.cats).toStrictEqual([]);

catsService.create(cat);
//@ts-ignore
expect(catsService.cats).toStrictEqual(expectedCatArray);
});
});
});
15 changes: 15 additions & 0 deletionssample/36-hmr-esm/src/cats/cats.service.ts
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import { Injectable } from '@nestjs/common';
import { Cat } from './interfaces/cat.interface';

@Injectable()
export class CatsService {
private readonly cats: Cat[] = [];

create(cat: Cat) {
this.cats.push(cat);
}

findAll(): Promise<Cat[]> {
return Promise.resolve(this.cats);
}
}
12 changes: 12 additions & 0 deletionssample/36-hmr-esm/src/cats/dto/create-cat.dto.ts
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import { IsInt, IsString } from 'class-validator';

export class CreateCatDto {
@IsString()
readonly name: string;

@IsInt()
readonly age: number;

@IsString()
readonly breed: string;
}
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