How do I set up typescript environment?

# Install Node.js and TypeScript 1. Download and install Node.js from [nodejs.org](https://nodejs.org/) (LTS version). 2. Verify installation: ``` npm --version node --version ``` 3. Create a project folder and initialize: ``` mkdir ts-learn cd ts-learn npm init -y npm install -D typescript@latest ``` 4. Create `greeter.ts`: ```ts function greeter(person: string) { return `Hello, ${person}`; } const user = "Jane User"; console.log(greeter(user)); ``` 5. Compile: ``` npx tsc greeter.ts node greeter.js ``` 6. Add `tsconfig.json`: ``` npx tsc --init ``` Edit to include `"strict": true`.

How do I master basic types and syntax?

# Explore Basic Types Read [TypeScript Basics](https://www.typescriptlang.org/docs/handbook/2/basic-types.html). **Practice:** 1. In VS Code, create `basics.ts`: ```ts let isDone: boolean = false; let age: number = 26; let name: string = "Daniel"; let list: number[] = [1, 2, 3]; let tuple: [string, number] = ["hello", 10]; enum Color { Red, Green, Blue } let c: Color = Color.Green; ``` 2. Compile and fix errors: `npx tsc basics.ts`. 3. Experiment with `any` vs `unknown`: ```ts let value: unknown = 4; if (typeof value === "number") { value.toFixed(); } ``` Use the [Playground](https://www.typescriptlang.org/play) for quick tests.

How do I work with functions and objects?

# Everyday Types Read [Everyday Types](https://www.typescriptlang.org/docs/handbook/2/everyday-types.html). **Practice:** 1. `functions.ts`: ```ts function greet(name: string): string { return `Hello, ${name.toUpperCase()}`; } function logPoint(pt: { x: number; y: number }): void { console.log(pt.x, pt.y); } ``` 2. Add optional props: ```ts type ID = number | string; function printId(id: ID) { console.log(id.toString()); } ``` 3. Compile and run: `npx tsc && node functions.js`.

How do I interfaces, unions, and generics?

# Advanced Everyday Patterns Continue Handbook: Interfaces, Unions. **Practice:** 1. `advanced.ts`: ```ts interface Point { x: number; y: number; } interface Animal { name: string; } interface Bear extends Animal { honey: boolean; } type Align = "left" | "right" | "center"; function alignText(text: string, align: Align) { } // Generics intro function identity (arg: T): T { return arg; } ``` 2. Test in Playground, compile locally.

How do I build a mini project?

# Apply Knowledge: Todo App 1. Create `todo.ts`: ```ts interface Todo { id: number; text: string; done: boolean; } type Action = "add" | "toggle" | "delete"; function manageTodo(todos: Todo[], action: Action, payload?: any): Todo[] { // Implement logic return todos; } let todos: Todo[] = []; console.log(manageTodo(todos, "add", {id:1, text:"Learn TS", done:false})); ``` 2. Implement functions, add modules if needed (`export/import`). 3. Compile, run, refactor JS code to TS. 4. Explore full Handbook for modules/classes.

Learn TypeScript Fundamentals in 5 Steps

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Step-by-Step Guide

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Install Node.js and TypeScript

Download and install Node.js from nodejs.org (LTS version).
Verify installation:

npm --version
node --version

Create a project folder and initialize:

mkdir ts-learn
cd ts-learn
npm init -y
npm install -D typescript@latest

Create greeter.ts:

function greeter(person: string) {
  return `Hello, ${person}`;
}

const user = "Jane User";
console.log(greeter(user));

Compile:

npx tsc greeter.ts
node greeter.js

Add tsconfig.json:

npx tsc --init

Edit to include "strict": true.

Why this step matters:

-Establishes a reliable workflow for writing and compiling TS code
-Prepares you for scalable projects mimicking real development setups

30-60 minutes

Node.js, npm, VS Code, Terminal

$0

Definition of Done

•tsc compiles .ts to .js without errors
•node runs the output JS successfully
•tsconfig.json is created and configured

Common Mistakes to Avoid

❌ Using global install for projects

→Install locally with `npm install -D typescript` for version control

❌ Skipping tsconfig.json

→Run `npx tsc --init` to enable strict mode

2

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🌐 Helpful Websites

TypeScript Handbook

documentation

Official comprehensive guide for beginners

TypeScript Playground

tool

Online editor to test code instantly

TypeScript Docs

documentation

Full reference and getting started guides

🛠️ Useful Tools

Visual Studio Code

IDE

Editor with built-in TS support

TypeScript Compiler (tsc)

Compiler

Compiles TS to JS

Node.js

Runtime

Runtime for executing compiled JS

Learn TypeScript Fundamentals in 5 Steps