Why Tree shaking and dead code removal in Angular? - Purpose & Use Cases

The Big Idea

Discover how Angular can magically shrink your app by cutting out code you never use!

The Scenario

Imagine building a large Angular app and manually trying to remove unused functions and components before deployment to keep the app small.

The Problem

Manually tracking and removing unused code is tedious, error-prone, and easy to miss parts, leading to bigger app sizes and slower load times.

The Solution

Tree shaking automatically detects and removes unused code during build, making your Angular app smaller and faster without extra effort.

Before vs After

✗ Before

import { unusedFunction } from './utils'; // but never call it
// unusedFunction stays in the bundle

✓ After

import { usedFunction } from './utils'; // only used code included in final bundle

What It Enables

It enables delivering lean, fast-loading Angular apps by automatically cutting out code you don't use.

Real Life Example

When you add a big library but only use one feature, tree shaking removes the rest so users don't download unnecessary code.

Key Takeaways

Manually removing unused code is hard and risky.

Tree shaking automates dead code removal during build.

This results in smaller, faster Angular applications.