Avoid Cross Module Dependencies with Dependency Cruiser

Avoid Cross Module Dependencies with Dependency Cruiser

Tópico: Avoid Cross Module Dependencies with Dependency Cruiser
Categoria: Tutoriais | Programação & Tecnologia
Idioma Principal: Português (Conteúdo de Tecnologia)

Descrição do Conteúdo / Informações:
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As applications grow, maintaining a clean architecture becomes increasingly difficult.

At first, everything feels manageable but after a few months (or years), projects often become full of:

• circular dependencies

• deeply coupled modules

• messy import paths

• forbidden cross-layer imports

• architectural chaos

The worst part is that these problems usually grow silently over time.

This is where dependency-cruiser becomes incredibly useful. It helps you visualize and enforce rules for your project dependencies before things become unmaintainable.

In this article, we'll explore:

• What dependency-cruiser is

• What problems it solves

• How to set it up

• Practical examples

• How to enforce architectural boundaries

Let's dive in.

🤔 What Is dependency-cruiser?

dependency-cruiser is a powerful tool for analyzing and validating dependencies in JavaScript and TypeScript projects.

It scans your project imports and helps you:

• detect circular dependencies

• enforce architecture rules

• visualize dependency graphs

• identify unused modules

• prevent bad import patterns

Think of it like:

👉 "ESLint for your project architecture."

🟢 What Problem Does dependency-cruiser Solve?

In large applications, dependencies can quickly become messy.

Example problems:

❌ Circular dependencies

A → B → C → A

These can cause:

• runtime issues

• undefined values

• difficult debugging

• unpredictable behavior

❌ Layer violations

Example:

components → api → components

Or:

ui → backend → ui

This breaks separation of concerns.

❌ Shared modules becoming dumping grounds

You often end up with:

/utils
/shared
/helpers

containing everything.

Over time:

• dependencies become tangled

• architecture loses structure

✅ dependency-cruiser helps enforce boundaries

You can define rules like:

• "UI cannot import backend"

• "Feature modules cannot depend on each other"

• "No circular dependencies allowed"

And automatically validate them in CI.

🟢 Installing dependency-cruiser

Setup is very simple.

Install it:

npm install --save-dev dependency-cruiser

🟢 Generating Your First Dependency Graph

One of the coolest features is visualization.

Example:

npx depcruise src --include-only "^src" --output-type dot | dot -T svg > dependency-graph.svg

This generates a visual graph of your project dependencies.

You can quickly spot:

• circular dependencies

• overly connected modules

• problematic architecture

In large projects, this is incredibly eye-opening.

🟢 Creating Rules

The real power comes from architecture validation.

Example config:

module.exports = {
forbidden: [
{
name: 'no-circular',
severity: 'error',
from: {},
to: {
circular: true
}
}
]
}

Now dependency-cruiser will fail whenever circular dependencies appear.

🟢 Real-World Example: Enforcing Layered Architecture

Imagine this structure:

src/
├── components/
├── features/
├── api/
├── utils/

You may want:

👉 components should never import from api

Rule example:

module.exports = {
forbidden: [
{
name: 'no-components-to-api',
from: {
path: '^src/components'
},
to: {
path: '^src/api'
}
}
]
}

Now architecture rules become automated.

This is extremely valuable for:

• large teams

• enterprise projects

• monorepos

• long-term maintainability

🟢 Using dependency-cruiser with Vue Projects

dependency-cruiser works great with:

• Vue

• Nuxt

• React

• Angular

• Node.js

• TypeScript monorepos

For Vue apps, it's especially useful when managing:

• composables

• feature modules

• shared UI components

• store architecture

• layered frontend structure

Example issue it can prevent:

components → composables → components

Which can become very difficult to maintain later.

🟢 CI Integration

One of the best things about dependency-cruiser:

👉 It can run automatically in CI/CD pipelines.

Example:

npx depcruise src --validate .dependency-cruiser.js

Now pull requests fail when architecture rules are violated.

This prevents technical debt from growing silently.

🟢 Common Mistakes

❌ Creating overly strict rules too early

Start simple.

Too many restrictions can frustrate teams.

❌ Ignoring the reports

The tool is only useful if rules are actually enforced.

❌ Not visualizing dependencies

Graphs often reveal architecture problems immediately.

❌ Allowing shared folders to grow uncontrollably

dependency-cruiser helps expose this early.

🧪 Best Practices

• Start with circular dependency detection

• Gradually add architectural rules

• Integrate validation into CI

• Use dependency graphs regularly

• Keep rules aligned with real architecture decisions

• Avoid massive shared utility folders

• Use the tool proactively — not only after problems appear

📖 Learn more

If you would like to learn more about Vue, Nuxt, JavaScript or other useful technologies, checkout VueSchool by clicking this link or by clicking the image below:

It covers most important concepts while building modern Vue or Nuxt applications that can help you in your daily work or side projects 😉

🧪 Advance skills

A certification boosts your skills, builds credibility, and opens doors to new opportunities. Whether you're advancing your career or switching paths, it's a smart step toward success.

Check out Certificates.dev by clicking this link or by clicking the image below:

Invest in yourself—get certified in Vue.js, JavaScript, Nuxt, Angular, React, and more!

✅ Summary

dependency-cruiser is an incredibly valuable tool for keeping project architecture healthy as applications grow.

Good architecture rarely happens accidentally.

Tools like dependency-cruiser help teams maintain structure, reduce technical debt, and prevent dependency chaos before it becomes a serious problem.

Take care!

And happy coding as always 🖥️