Re-export

Learn to re-export modules.

Re-export

Re-export passes an item from a module directly through another module without importing it first. The syntax export { name } from "./mod" forwards the item. A barrel file gathers multiple modules behind a single entry point, simplifying import paths.

// index.ts
export { topla } from "./matematik";
export { cikar } from "./cikarma";

// app.ts
import { topla, cikar } from "./index";

Barrel files

A barrel file, usually named index.ts, exports all items from modules in a folder from a single point. The consumer imports only the barrel instead of listing each module. This shortens import paths and simplifies module organization.

Exercise Export with barrel pattern

Define topla with signature (a: number, b: number): number returning a + b. Define cikar with signature (a: number, b: number): number returning a - b. Export both using the barrel pattern with export { }. Print topla(10, 3) and cikar(10, 3) on separate lines.

Show example solution

function topla(a: number, b: number): number {
  return a + b;
}

function cikar(a: number, b: number): number {
  return a - b;
}

export { topla, cikar };

console.log(topla(10, 3));
console.log(cikar(10, 3));

Test yourself

Which of the following is the re-export syntax?
- export { topla } from "./matematik"
- import topla from "./matematik"
- import { topla } from "./matematik"
- export default topla
Show answer

export { topla } from "./matematik" — Re-export is the export { } from syntax; it forwards an item from a module directly. import { } from is an import; export default is a default export; import without braces is a default import.

Add from

export { topla } ____ "./matematik";

Show answer

export { topla } from "./matematik";

Re-export parts

export { } from

Re-export syntax
index.ts

Barrel file name
export { topla, cikar }

Multiple items re-exported
from "./matematik"

Source module path

Next lesson: Type-only import

We Are Enhancing Your Experience

Cookie Preferences

Strictly Necessary Cookies

Analytical Cookies