Angular CLI installation and setup - Performance & Optimization

Performance: Angular CLI installation and setup

MEDIUM IMPACT

This affects the initial project setup speed and the size of the development environment, impacting how quickly you can start coding and testing.

Setting up a new Angular project

Angular

npm install -g @angular/cli@latest && ng new my-app

Installs dependencies automatically during project creation, reducing total setup time.

📈 Performance GainSingle install step, saves 10-15 seconds in setup

Setting up a new Angular project

Angular

npm install -g @angular/cli@latest && ng new my-app --skip-install && cd my-app && npm install

Skipping install during project creation causes an extra npm install step, delaying setup and increasing wait time.

📉 Performance CostBlocks setup for extra 10-15 seconds due to redundant install step

Performance Comparison

Pattern	Setup Time	Build Time	Bundle Size Impact	Verdict
Skipping install during ng new	Longer due to extra npm install	No direct impact	No impact	[X] Bad
Default ng new with install	Faster single step	No direct impact	No impact	[OK] Good
Global install with --force	Normal install time	Potential rebuild delays	No impact	[X] Bad
Global install without --force	Normal install time	Smooth builds	No impact	[OK] Good

Rendering Pipeline

Angular CLI installation and setup do not directly affect browser rendering but impact developer productivity and build times, which indirectly influence how fast the app can be served and updated.

→Build Process

→Dependency Installation

⚠️ BottleneckDependency installation and build time

Optimization Tips

1Run 'ng new' without --skip-install to avoid extra install steps.

2Install Angular CLI globally without --force for stable builds.

3Avoid redundant installs to speed up project setup.

Performance Quiz - 3 Questions

What is the performance impact of skipping dependency installation during 'ng new' and running it separately?

A It improves bundle size by delaying install.

B It reduces setup time by splitting tasks.

C It causes an extra install step, increasing setup time.

D It has no impact on performance.

DevTools: Network

How to check: Open DevTools Network panel during first app load after build; check for large bundle sizes or slow asset loading.

What to look for: Look for large main.js or vendor.js files that delay LCP; smaller bundles mean faster load.

Practice

1. What is the main purpose of the Angular CLI tool?

easy

A. To create and manage Angular projects easily

B. To write Angular component code manually

C. To deploy Angular apps to the server automatically

D. To replace the need for Node.js in Angular development

Solution

1. Step 1: Understand Angular CLI role

   Angular CLI is a command-line tool that helps create and manage Angular projects quickly.

2. Step 2: Compare options

   Only To create and manage Angular projects easily correctly describes this purpose. Writing code manually or deployment are not CLI's main roles.

3. Final Answer:

   To create and manage Angular projects easily -> Option A

4. Quick Check:

   Angular CLI = project creation and management [OK]

Hint: Angular CLI helps start projects fast [OK]

Common Mistakes:

• Thinking CLI writes code for you
• Confusing CLI with deployment tools
• Assuming CLI replaces Node.js

2. Which command correctly installs Angular CLI globally using npm?

easy

A. npm install @angular/cli

B. npm install -g @angular/cli

C. ng install -g @angular/cli

D. npm global install angular-cli

Solution

1. Step 1: Recall npm global install syntax

   The correct syntax to install a package globally is npm install -g package-name.

2. Step 2: Match Angular CLI package name

   The official package name is @angular/cli, so the full command is npm install -g @angular/cli.

3. Final Answer:

   npm install -g @angular/cli -> Option B

4. Quick Check:

   Global install = npm install -g [OK]

Hint: Use npm install -g for global packages [OK]

Common Mistakes:

• Omitting the -g flag for global install
• Using ng install instead of npm install
• Wrong package name or missing @angular prefix

3. After installing Angular CLI globally, what command creates a new Angular project named my-app?

medium

A. ng create my-app

B. npm new my-app

C. ng generate project my-app

D. ng new my-app

Solution

1. Step 1: Identify Angular CLI command for new projects

   The Angular CLI uses ng new to create new projects.

2. Step 2: Check command syntax

   The correct syntax is ng new project-name, so ng new my-app is correct.

3. Final Answer:

   ng new my-app -> Option D

4. Quick Check:

   New project = ng new [OK]

Hint: Use ng new to create projects [OK]

Common Mistakes:

• Using ng create instead of ng new
• Trying npm new which doesn't exist
• Using ng generate project incorrectly

4. You run ng serve but get an error saying command not found. What is the most likely cause?

medium

A. Angular CLI is not installed globally

B. You forgot to create a new project first

C. You need to run npm start instead

D. Your Node.js version is too new

Solution

1. Step 1: Understand ng serve command

   ng serve runs the Angular development server and requires Angular CLI installed globally or locally.

2. Step 2: Analyze error cause

   If the command is not found, it usually means Angular CLI is not installed globally or not in PATH.

3. Final Answer:

   Angular CLI is not installed globally -> Option A

4. Quick Check:

   ng serve error = missing global CLI [OK]

Hint: Check if Angular CLI is installed globally [OK]

Common Mistakes:

• Assuming npm start replaces ng serve
• Ignoring CLI installation errors
• Blaming Node.js version without checking CLI

5. You want to create a new Angular project with routing enabled and SCSS styling using Angular CLI. Which command should you run?

hard

A. ng create my-app --routing --style=scss

B. ng new my-app -routing -style=scss

C. ng new my-app --routing --style=scss

D. ng generate project my-app --routing --style=scss

Solution

1. Step 1: Recall correct command for new project with options

   The Angular CLI uses ng new with flags like --routing and --style=scss to enable routing and SCSS styling.

2. Step 2: Verify option syntax

   Options must use double dashes and equal sign for style. So ng new my-app --routing --style=scss is correct.

3. Final Answer:

   ng new my-app --routing --style=scss -> Option C

4. Quick Check:

   New project with routing and SCSS = ng new with flags [OK]

Hint: Use ng new with --routing and --style flags [OK]

Common Mistakes:

• Using ng create instead of ng new
• Using single dash for options
• Wrong option syntax like -routing