How to manage modules in NestJS?

by Maciej Sikorski

App

Users

App

Users

Notifications

App

Users

Notifications

App

Users

Notifications

Cats

App

Users

Notifications

Cats

App

Users

Notifications

Cats

Dogs

Permissions

@Module({
	imports: [
    	forwardRef(() => CatsModule),
        forwardRef(() => UsersModule),
    ],
    providers: [NotificationService],
    exports: [NotificationService],
})
export class NotificationModule {}

@Module({
	imports: [
    	forwardRef(() => CatsModule),
        forwardRef(() => UsersModule),
    ],
    providers: [NotificationService],
    exports: [NotificationService],
})
export class NotificationModule {}

What will you learn today?

Why do we fail at defining modules
How to find good module's boundaries
What is the purpose of a module

Chapter I

How do we define modules?

import { Injectable } from '@nestjs/common';
import { Cat } from './interfaces/cat.interface'

@Injectable()
class CatsService {
	private cats: Cat[] = [];
    
    create(cat: Cat) {
    	this.cats.push(cat);
    }
        
    findAll(): Cat[] {
    	return this.cats;
    }
}

import { Injectable } from '@nestjs/common';
import { Cat } from './interfaces/cat.interface'

@Injectable()
class CatsService {
	private cats: Cat[] = [];
    
    create(cat: Cat) {
    	//...
    }
    
    update(cat: Cat) {
    	//...
    }
    
    remove(catId: number) {
    	//...
    }
        
    findAll(): Cat[] {
    	//...
    }
    
    findOne(catId: number): Cat {
    	//...
    }
}

import { Injectable } from '@nestjs/common';
import { Cat } from './interfaces/cat.interface'

@Injectable()
class CatsService {
	private cats: Cat[] = [];
    
    create(cat: Cat) {
    	//...
    }
    
    update(cat: Cat) {
    	//...
    }
    
    remove(catId: number) {
    	//...
    }
        
    findAll(): Cat[] {
    	//...
    }
    
    findOne(catId: number): Cat {
    	//...
    }
}

import { Injectable } from '@nestjs/common';
import { Cat } from './interfaces/cat.interface'

@Injectable()
class CatsService {
//...
    
    adopt(catId: number, clientId: number) {
    }
    
    returnCat(catId: number) {
    }
}

import { Injectable } from '@nestjs/common';
import { Cat } from './interfaces/cat.interface'

@Injectable()
class CatsService {
//...
    
    adopt(catId: number, clientId: number) {
    }
    
    returnCat(catId: number) {
    }
    
    feed(catId: number) {
    }
    
    clean(catId: number) {
    }
    
    physicalExamination(catId: number, data: ExaminationData) {
    }
    
    changePlace(catId: number, placeId: number) {
    }
}

import { Injectable } from '@nestjs/common';
import { Cat } from './interfaces/cat.interface'

@Injectable()
class CatsService {
    adopt(catId: number, clientId: number) {
    }
    
    returnCat(catId: number) {
    }
}

import { Injectable } from '@nestjs/common';
import { Cat } from './interfaces/cat.interface'

@Injectable()
class CatsService {
	constructor(private clientService: ClientService) {}
    
    adopt(catId: number, clientId: number) {
    	if(!this.clientService.canAdopt(clientId)) {
        	throw new Error(`Client ${clientId} can't adopt a cat`);
        }
    }
    
    returnCat(catId: number) {
    }
}

import { Injectable } from '@nestjs/common';
import { Cat } from './interfaces/cat.interface'

@Injectable()
class CatsService {
	constructor(private clientService: ClientService) {}
    
    adopt(catId: number, clientId: number) {
    	if(!this.clientService.canAdopt(clientId)) {
        	throw new Error(`Client ${clientId} can't adopt a cat`);
        }
        
        
        // The rest of process
    }
    
    returnCat(catId: number) {
    }
}

import { Injectable } from '@nestjs/common';
import { Cat } from './interfaces/cat.interface'

@Injectable()
class CatsService {
	constructor(private clientService: ClientService) {}
    
    adopt(catId: number, clientId: number) {
    	if(!this.clientService.canAdopt(clientId)) {
        	throw new Error(`Client ${clientId} can't adopt a cat`);
        }
        
        
        // The rest of process
    }
    
    returnCat(catId: number) {
    	const cat = this.catsRepository.findOne(cat);
        this.clientService.banNextAdoption(cat.ownerId);
        
        // The rest of the process
    }
}

CatsModule

class CatsService {
	adopt(clientId, catId) {}
	returnCat(catId) {}
}

CatsModule

class CatsService {
	adopt(clientId, catId) {}
	returnCat(catId) {}
}

ClientsModule

class ClientService {
	canAdopt(clientId) {}
    banNextAdoption(clientId) {}
}

CatsModule

class CatsService {
	adopt(clientId, catId) {}
	returnCat(catId) {}
}

ClientsModule

class ClientService {
	canAdopt(clientId) {}
    banNextAdoption(clientId) {}
}

CatsModule

class CatsService {
	adopt(clientId, catId) {}
	returnCat(catId) {}
}

ClientsModule

class ClientService {
	canAdopt(clientId) {}
    banNextAdoption(clientId) {}
    sponsorFeed(clientId, catId, food) {}
}

CatsModule

class CatsService {
	adopt(clientId, catId) {}
	returnCat(catId) {}
}

ClientsModule

class ClientService {
	canAdopt(clientId) {}
    banNextAdoption(clientId) {}
    sponsorFeed(clientId, catId, food) {
    	// ...
        this.increaseAdoptionProbability(clientId);
        // ...
    }
    increaseAdoptionProbability(clientId) {}
}

CatsModule

class CatsService {
	adopt(clientId, catId) {}
	returnCat(catId) {}
}

ClientsModule

class ClientService {
	canAdopt(clientId) {}
    banNextAdoption(clientId) {}
    sponsorFeed(clientId, catId, food) {
    	// ...
        this.increaseAdoptionProbability(clientId);
        this.catsService.increaseCatBudget(catId, amount);
        // ...
    }
    increaseAdoptionProbability(clientId) {}
}

CatsModule

class CatsService {
	adopt(clientId, catId) {}
	returnCat(catId) {}
}

ClientsModule

class ClientService {
	constructor(private catsService: CatsService) {}

	canAdopt(clientId) {}
    banNextAdoption(clientId) {}
    sponsorFeed(clientId, catId, food) {
    	// ...
        this.increaseAdoptionProbability(clientId);
        this.catsService.increaseCatBudget(catId, amount);
        // ...
    }
    increaseAdoptionProbability(clientId) {}
}

ClientsModule

class ClientService {
	constructor(private catsService: CatsService) {}

	canAdopt(clientId) {}
    banNextAdoption(clientId) {}
    sponsorFeed(clientId, catId, food) {
    	// ...
        this.increaseAdoptionProbability(clientId);
        this.catsService.increaseCatBudget(catId, amount);
        // ...
    }
    increaseAdoptionProbability(clientId) {}
}

CatsModule

class CatsService {
	adopt(clientId, catId) {}
	returnCat(catId) {}
    increaseCatBudget(catId, amount) {}
}

ClientsModule

class ClientService {
	constructor(private catsService: CatsService) {}

	canAdopt(clientId) {}
    banNextAdoption(clientId) {}
    sponsorFeed(clientId, catId, food) {
    	// ...
        this.increaseAdoptionProbability(clientId);
        this.catsService.increaseCatBudget(catId, amount);
        // ...
    }
    increaseAdoptionProbability(clientId) {}
}

CatsModule

class CatsService {
	adopt(clientId, catId) {}
	returnCat(catId) {}
    increaseCatBudget(catId, amount) {}
}

ClientsModule

class ClientService {
	constructor(private catsService: CatsService) {}

	canAdopt(clientId) {}
    banNextAdoption(clientId) {}
    sponsorFeed(clientId, catId, food) {
    	// ...
        this.increaseAdoptionProbability(clientId);
        this.catsService.increaseCatBudget(catId, amount);
        // ...
    }
    increaseAdoptionProbability(clientId) {}
}

CatsModule

class CatsService {
	adopt(clientId, catId) {}
	returnCat(catId) {}
    increaseCatBudget(catId, amount) {}
}

What we do wrong?

Logical cohesion

What we do wrong?

Logical cohesion

Functional cohesion

What we do wrong?

Logical cohesion
Focusing on nouns

Functional cohesion

What we do wrong?

Logical cohesion
Focusing on nouns

Functional cohesion
Focusing on verbs

What we do wrong?

Logical cohesion
Focusing on nouns
Building modules around entities & data structure

Functional cohesion
Focusing on verbs

What we do wrong?

Logical cohesion
Focusing on nouns
Building modules around entities & data structure

Functional cohesion
Focusing on verbs
Building modules & entities around a problem & processes

Chapter II

Let's apply it to our app

ClientsModule

class ClientService {
	constructor(private catsService: CatsService) {}

	canAdopt(clientId) {}
    banNextAdoption(clientId) {}
    sponsorFeed(clientId, catId, food) {
    	// ...
        this.increaseAdoptionProbability(clientId);
        this.catsService.increaseCatBudget(catId, amount);
        // ...
    }
    increaseAdoptionProbability(clientId) {}
}

CatsModule

class CatsService {
	adopt(clientId, catId) {}
	returnCat(catId) {}
    increaseCatBudget(catId, amount) {}
}

ClientsModule

class ClientService {
	canAdopt(clientId) {}
    banNextAdoption(clientId) {}
    sponsorFeed(clientId, catId, food) {}
    increaseAdoptionProbability(clientId) {}
}

CatsModule

class CatsService {
	adopt(clientId, catId) {}
	returnCat(catId) {}
    increaseCatBudget(catId, amount) {}
}

ClientsModule

class ClientService {
	canAdopt(clientId) {}
    banNextAdoption(clientId) {}
    sponsorFeed(clientId, catId, food) {}
    increaseAdoptionProbability(clientId) {}
}

CatsModule

class CatsService {
	adopt(clientId, catId) {}
	returnCat(catId) {}
    increaseCatBudget(catId, amount) {}
}

AdoptionModule

class AdoptionService {

}

ClientsModule

class ClientService {
	canAdopt(clientId) {}
    banNextAdoption(clientId) {}
    sponsorFeed(clientId, catId, food) {}
    increaseAdoptionProbability(clientId) {}
}

CatsModule

class CatsService {
    increaseCatBudget(catId, amount) {}
}

AdoptionModule

class AdoptionService {
	adopt(clientId, catId) {}
	returnCat(catId) {}
}

ClientsModule

class ClientService {
	canAdopt(clientId) {}
    banNextAdoption(clientId) {}
    sponsorFeed(clientId, catId, food) {}
    increaseAdoptionProbability(clientId) {}
}

CatsModule

class CatsService {
    increaseCatBudget(catId, amount) {}
}

AdoptionModule

class AdoptionService {
	adopt(clientId, catId) {}
	returnCat(catId) {}
}

ClientsModule

class ClientService {
	canAdopt(clientId) {}
    banNextAdoption(clientId) {}
    sponsorFeed(clientId, catId, food) {}
    increaseAdoptionProbability(clientId) {}
}

CatsModule

class CatsService {
    increaseCatBudget(catId, amount) {}
}

AdoptionModule

class AdoptionService {
	adopt(clientId, catId) {}
	returnCat(catId) {}
}

ClientsModule

class ClientService {
	canAdopt(clientId) {}
    banNextAdoption(clientId) {}
    sponsorFeed(clientId, catId, food) {}
    increaseAdoptionProbability(clientId) {}
}

CatsModule

class CatsService {
    increaseCatBudget(catId, amount) {}
}

AdoptionModule

class AdoptionService {
	adopt(clientId, catId) {}
	returnCat(catId) {}
}

VerificationModule

class VerificationService {

}

ClientsModule

class ClientService {
    sponsorFeed(clientId, catId, food) {}
    increaseAdoptionProbability(clientId) {}
}

CatsModule

class CatsService {
    increaseCatBudget(catId, amount) {}
}

AdoptionModule

class AdoptionService {
	adopt(clientId, catId) {}
	returnCat(catId) {}
}

VerificationModule

class VerificationService {
	canAdopt(clientId) {}
    banNextAdoption(clientId) {}
}

ClientsModule

class ClientService {
    sponsorFeed(clientId, catId, food) {}
    increaseAdoptionProbability(clientId) {}
}

CatsModule

class CatsService {
    increaseCatBudget(catId, amount) {}
}

AdoptionModule

class AdoptionService {
	adopt(clientId, catId) {}
	returnCat(catId) {}
}

VerificationModule

class VerificationService {
	canAdopt(clientId) {}
    banNextAdoption(clientId) {}
}

ClientsModule

class ClientService {
    sponsorFeed(clientId, catId, food) {}
}

CatsModule

class CatsService {
    increaseCatBudget(catId, amount) {}
}

AdoptionModule

class AdoptionService {
	adopt(clientId, catId) {}
	returnCat(catId) {}
}

VerificationModule

class VerificationService {
	canAdopt(clientId) {}
    banNextAdoption(clientId) {}
    increaseAdoptionProbability(clientId) {}
}

ClientsModule

class ClientService {
    sponsorFeed(clientId, catId, food) {}
}

CatsModule

class CatsService {
    increaseCatBudget(catId, amount) {}
}

AdoptionModule

class AdoptionService {
	adopt(clientId, catId) {}
	returnCat(catId) {}
}

VerificationModule

class VerificationService {
	canAdopt(clientId) {}
    banNextAdoption(clientId) {}
    increaseAdoptionProbability(clientId) {}
}

ClientsModule

class ClientService {
    sponsorFeed(clientId, catId, food) {}
}

CatsModule

class CatsService {
    increaseCatBudget(catId, amount) {}
}

AdoptionModule

class AdoptionService {
	adopt(clientId, catId) {}
	returnCat(catId) {}
}

VerificationModule

class VerificationService {
	canAdopt(clientId) {}
    banNextAdoption(clientId) {}
    increaseAdoptionProbability(clientId) {}
}

ClientsModule

class ClientService {
    sponsorFeed(clientId, catId, food) {}
}

CatsModule

class CatsService {
    increaseCatBudget(catId, amount) {}
}

AdoptionModule

class AdoptionService {
	adopt(clientId, catId) {}
	returnCat(catId) {}
}

VerificationModule

class VerificationService {
	canAdopt(clientId) {}
    banNextAdoption(clientId) {}
    increaseAdoptionProbability(clientId) {}
}

CharityWorkModule

class CharityWorkService {
}

ClientsModule

class ClientService {
}

CatsModule

class CatsService {
    increaseCatBudget(catId, amount) {}
}

AdoptionModule

class AdoptionService {
	adopt(clientId, catId) {}
	returnCat(catId) {}
}

VerificationModule

class VerificationService {
	canAdopt(clientId) {}
    banNextAdoption(clientId) {}
    increaseAdoptionProbability(clientId) {}
}

CharityWorkModule

class CharityWorkService {
    sponsorFeed(clientId, catId, food) {}
}

ClientsModule

class ClientService {
}

CatsModule

class CatsService {
    increaseCatBudget(catId, amount) {}
}

AdoptionModule

class AdoptionService {
	adopt(clientId, catId) {}
	returnCat(catId) {}
}

VerificationModule

class VerificationService {
	canAdopt(clientId) {}
    banNextAdoption(clientId) {}
    increaseAdoptionProbability(clientId) {}
}

CharityWorkModule

class CharityWorkService {
    sponsorFeed(clientId, catId, food) {}
}

BudgetModule

class BudgetService {
}

ClientsModule

class ClientService {
}

CatsModule

class CatsService {
}

AdoptionModule

class AdoptionService {
	adopt(clientId, catId) {}
	returnCat(catId) {}
}

VerificationModule

class VerificationService {
	canAdopt(clientId) {}
    banNextAdoption(clientId) {}
    increaseAdoptionProbability(clientId) {}
}

CharityWorkModule

class CharityWorkService {
    sponsorFeed(clientId, catId, food) {}
}

BudgetModule

class BudgetService {
    increaseCatBudget(catId, amount) {}
}

ClientsModule

class ClientService {
}

CatsModule

class CatsService {
	create(cat) {}
    update(cat) {}
    delete(catId) {}
    read(catId) {}
}

AdoptionModule

class AdoptionService {
	adopt(clientId, catId) {}
	returnCat(catId) {}
}

VerificationModule

class VerificationService {
	canAdopt(clientId) {}
    banNextAdoption(clientId) {}
    increaseAdoptionProbability(clientId) {}
}

CharityWorkModule

class CharityWorkService {
    sponsorFeed(clientId, catId, food) {}
}

BudgetModule

class BudgetService {
    increaseCatBudget(catId, amount) {}
}

ClientsModule

class ClientService {
	create(client) {}
    update(client) {}
    delete(clientId) {}
    read(clientId) {}
}

CatsModule

class CatsService {
	create(cat) {}
    update(cat) {}
    delete(catId) {}
    read(catId) {}
}

AdoptionModule

class AdoptionService {
	adopt(clientId, catId) {}
	returnCat(catId) {}
}

VerificationModule

class VerificationService {
	canAdopt(clientId) {}
    banNextAdoption(clientId) {}
    increaseAdoptionProbability(clientId) {}
}

CharityWorkModule

class CharityWorkService {
    sponsorFeed(clientId, catId, food) {}
}

BudgetModule

class BudgetService {
    increaseCatBudget(catId, amount) {}
}

Chapter III

Too bad it's not that simple

ClientsModule

class ClientService {
	create(client) {}
    update(client) {}
    delete(clientId) {}
    read(clientId) {}
}

CatsModule

class CatsService {
	create(cat) {}
    update(cat) {}
    delete(catId) {}
    read(catId) {}
}

AdoptionModule

class AdoptionService {
	adopt(clientId, catId) {}
	returnCat(catId) {}
}

VerificationModule

class VerificationService {
	canAdopt(clientId) {}
    banNextAdoption(clientId) {}
    increaseAdoptionProbability(clientId) {}
}

CharityWorkModule

class CharityWorkService {
    sponsorFeed(clientId, catId, food) {}
}

BudgetModule

class BudgetService {
    increaseCatBudget(catId, amount) {}
}

ClientsModule

class ClientService {
	create(client) {}
    update(client) {}
    delete(clientId) {}
    read(clientId) {}
}

CatsModule

class CatsService {
	create(cat) {}
    update(cat) {}
    delete(catId) {}
    read(catId) {}
}

AdoptionModule

class AdoptionService {
	adopt(clientId, catId) {}
	returnCat(catId) {}
}

VerificationModule

class VerificationService {
	canAdopt(clientId) {}
    banNextAdoption(clientId) {}
    increaseAdoptionProbability(clientId) {}
}

CharityWorkModule

class CharityWorkService {
    sponsorFeed(clientId, catId, food) {}
}

BudgetModule

class BudgetService {
    increaseCatBudget(catId, amount) {}
}

ClientsModule

class ClientService {
	create(client) {}
    update(client) {}
    delete(clientId) {}
    read(clientId) {}
}

CatsModule

class CatsService {
	create(cat) {}
    update(cat) {}
    delete(catId) {}
    read(catId) {}
}

AdoptionModule

class AdoptionService {
	adopt(clientId, catId) {}
	returnCat(catId) {}
}

VerificationModule

class VerificationService {
	canAdopt(clientId) {}
    banNextAdoption(clientId) {}
    increaseAdoptionProbability(clientId) {}
}

CharityWorkModule

class CharityWorkService {
    sponsorFeed(clientId, catId, food) {}
}

BudgetModule

class BudgetService {
    increaseCatBudget(catId, amount) {}
}

ClientsModule

class ClientService {
	create(client) {}
    update(client) {}
    delete(clientId) {}
    read(clientId) {}
}

CatsModule

class CatsService {
	create(cat) {}
    update(cat) {}
    delete(catId) {}
    read(catId) {}
}

AdoptionModule

class AdoptionService {
	adopt(clientId, catId) {}
	returnCat(catId) {}
}

VerificationModule

class VerificationService {
	canAdopt(clientId) {}
    banNextAdoption(clientId) {}
    increaseAdoptionProbability(clientId) {}
}

CharityWorkModule

class CharityWorkService {
    sponsorFeed(clientId, catId, food) {}
}

BudgetModule

class BudgetService {
    increaseCatBudget(catId, amount) {}
}

ClientsModule

class ClientService {
	create(client) {}
    update(client) {}
    delete(clientId) {}
    read(clientId) {}
}

CatsModule

class CatsService {
	create(cat) {}
    update(cat) {}
    delete(catId) {}
    read(catId) {}
}

AdoptionModule

class AdoptionService {
	adopt(clientId, catId) {}
	returnCat(catId) {}
}

ClientsModule

class ClientService {
	create(client) {}
    update(client) {}
    delete(clientId) {}
    read(clientId) {}
}

CatsModule

class CatsService {
	create(cat) {}
    update(cat) {}
    delete(catId) {}
    read(catId) {}
}

AdoptionModule

class AdoptionService {
	adopt(clientId, catId) {}
	returnCat(catId) {}
}

ClientsModule

class ClientService {
	create(client) {}
    update(client) {}
    delete(clientId) {}
    read(clientId) {}
}

CatsModule

class CatsService {
	create(cat) {}
    update(cat) {}
    delete(catId) {}
    read(catId) {}
}

AdoptionModule

class AdoptionService {
	adopt(clientId, catId) {}
	returnCat(catId) {}
}

CatPreview

class CatPreview {
	preview(catId) {}
}

CatsModule

class CatsService {
	create(cat) {}
    update(cat) {}
    delete(catId) {}
    read(catId) {}
}

AdoptionModule

class AdoptionService {
	adopt(clientId, catId) {}
	returnCat(catId) {}
}

BudgetModule

class BudgetService {
    increaseCatBudget(catId, amount) {}
}

CatsModule

class CatsService {
	create(cat) {}
    update(cat) {}
    delete(catId) {}
    read(catId) {}
}

AdoptionModule

class AdoptionService {
	adopt(clientId, catId) {}
	returnCat(catId) {}
}

AddCatModule

class AddCatService {
	add(catData) {}
}

BudgetModule

class BudgetService {
    increaseCatBudget(catId, amount) {}
}

Integration patterns

fetching/calling another module synchronously
data layer integration
async events exchange
etc.

Chapter IV

Plot twist

ClientsModule

class ClientService {
	create(client) {}
    update(client) {}
    delete(clientId) {}
    read(clientId) {}
}

CatsModule

class CatsService {
	create(cat) {}
    update(cat) {}
    delete(catId) {}
    read(catId) {}
}

AdoptionModule

class AdoptionService {
	adopt(clientId, catId) {}
	returnCat(catId) {}
}

VerificationModule

class VerificationService {
	canAdopt(clientId) {}
    banNextAdoption(clientId) {}
    increaseAdoptionProbability(clientId) {}
}

CharityWorkModule

class CharityWorkService {
    sponsorFeed(clientId, catId, food) {}
}

BudgetModule

class BudgetService {
    increaseCatBudget(catId, amount) {}
}

ClientsModule

class ClientService {
	create(client) {}
    update(client) {}
    delete(clientId) {}
    read(clientId) {}
}

CatsModule

class CatsService {
	create(cat) {}
    update(cat) {}
    delete(catId) {}
    read(catId) {}
}

AdoptionModule

class AdoptionService {
	adopt(clientId, catId) {}
	returnCat(catId) {}
}

VerificationModule

class VerificationService {
	canAdopt(clientId) {}
    banNextAdoption(clientId) {}
    increaseAdoptionProbability(clientId) {}
}

CharityWorkModule

class CharityWorkService {
    sponsorFeed(clientId, catId, food) {}
}

BudgetModule

class BudgetService {
    increaseCatBudget(catId, amount) {}
}

class ClientService {
	create(client) {}
    update(client) {}
    delete(clientId) {}
    read(clientId) {}
}

AppModule

class CatsService {
	create(cat) {}
    update(cat) {}
    delete(catId) {}
    read(catId) {}
}

class AdoptionService {
	adopt(clientId, catId) {}
	returnCat(catId) {}
}

class VerificationService {
	canAdopt(clientId) {}
    banNextAdoption(clientId) {}
    increaseAdoptionProbability(clientId) {}
}

class CharityWorkService {
    sponsorFeed(clientId, catId, food) {}
}

class BudgetService {
    increaseCatBudget(catId, amount) {}
}

class Clients {
	create(client) {}
    update(client) {}
    delete(clientId) {}
    read(clientId) {}
}

class Cats {
	create(cat) {}
    update(cat) {}
    delete(catId) {}
    read(catId) {}
}

class Adoption {
	start(clientId, catId) {}
	returnCat(catId) {}
}

class Verification {
	canAdopt(clientId) {}
    banNextAdoption(clientId) {}
    increaseAdoptionProbability(clientId) {}
}

class CharityWork {
    sponsorFeed(clientId, catId, food) {}
}

class Budget {
    increase(budgetId, amount) {}
}

Why do we even need modules?

To specify the public interface and hide the internals
To configure what is a part of an application
For testing, to use only what necessary or modify the setup

Next time - Pragmatic NestJS

Thank you!

maciej-sikorski-a01b26149

@_MaciejSikorski

Sikora00

nestjs-talks.com

How to manage modules in NestJS?

By Maciej Sikorski

How to manage modules in NestJS?

2 months ago
177

How to manage modules in NestJS?

How to manage modules in NestJS?

What will you learn today?

Chapter I

How do we define modules?

What we do wrong?

What we do wrong?

What we do wrong?

What we do wrong?

What we do wrong?

What we do wrong?

What we do wrong?

Chapter II

Let's apply it to our app

Chapter III

Too bad it's not that simple

Integration patterns

Chapter IV

Plot twist

Why do we even need modules?

Why do we even need modules?

Next time - Pragmatic NestJS

Thank you!

How to manage modules in NestJS?

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