Import & Export

TypeScript uses ES modules for code organization.

Syntax

TYPESCRIPT

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// math.ts
export function add(a: number, b: number): number {
    return a + b;
}

// app.ts
import { add } from "./math";
console.log(add(1, 2));

Module Import/Export

TYPESCRIPT

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// math.ts
export function add(a: number, b: number): number {
    return a + b;
}

export function multiply(a: number, b: number): number {
    return a * b;
}

export default class Calculator {
    result = 0;
    add(n: number) { this.result += n; return this; }
}

// app.ts
import Calculator, { add, multiply } from "./math";
console.log(add(2, 3));
let calc = new Calculator();
calc.add(5);

Try It Yourself

Next Lesson

Type Assertions