TypeScript Compiler Engine

Run type-checking and translation entirely client-side using the browser compiler. Pure static outputs.

Loading TypeScript Compiler (JS Engine)...

main.ts (TypeScript)

// Welcome to the Fun Koding TypeScript Compiler!
// Compile and run TypeScript code entirely in your browser.

interface User {
    firstName: string;
    lastName: string;
    role: string;
}

class Developer implements User {
    constructor(
        public firstName: string, 
        public lastName: string,
        public role: string = "TypeScript Developer"
    ) {}

    greet(): string {
        return `Hello, I'm ${this.firstName} ${this.lastName}, a ${this.role}!`;
    }
}

const dev: User = new Developer("Fun", "Koder");
console.log(dev.greet());

// Let's test type safety
const logUserInfo = (u: User): void => {
    console.log(`User Info: ${u.firstName} (${u.role})`);
};

logUserInfo(dev);

How to Use the TypeScript Compiler

The TypeScript Compiler is a static playground built to write, type-check, and compile TypeScript code directly in the browser. TypeScript extends JavaScript by adding static types, helping developers detect interface errors, parameter mismatches, and structural bugs during code compilation. This utility runs the official TypeScript compiler engine client-side, transpiling your script into clean JavaScript instantly.

To use the playground, write your TypeScript code (including interfaces, classes, type definitions, and generics) in the `main.ts` editor panel on the left. The text area includes line numbering and custom tab indentations for code formatting. Click the 'Run Code' button to trigger type-checking and run the script. On the right panel, toggle between the 'Terminal Output' tab to read captured logs and console prints, and the 'Compiled JS' tab to inspect the exact JavaScript code emitted by the compiler. If type-checking fails, detailed compilation errors will print in the console.

This tool is highly beneficial for modern web developer workflows. Prototyping complex types, validating interfaces, and testing generic functions can be done instantly without configuring local tsconfig files or running build tools. It serves as an instant playground to learn typescript features, check compiler emissions, and verify script logic.