export

export #

The export statement is used to export functions, objects, or primitive values from a JavaScript module. The exported values can be imported and used by other programs with the import statement.

// 하나씩 내보내기
export let name1, name2, …, nameN; // var, const도 동일
export let name1 = …, name2 = …, …, nameN; // var, const도 동일
export function functionName(){...}
export class ClassName {...}

// 목록으로 내보내기
export { name1, name2, …, nameN };

// 내보내면서 이름 바꾸기
export { variable1 as name1, variable2 as name2, …, nameN };

// 비구조화로 내보내기
export const { name1, name2: bar } = o;

// 기본 내보내기
export default expression;
export default function (…) { … } // also class, function*
export default function name1(…) { … } // also class, function*
export { name1 as default, … };

// 모듈 조합
export * from …; // does not set the default export
export * as name1 from …;
export { name1, name2, …, nameN } from …;
export { import1 as name1, import2 as name2, …, nameN } from …;
export { default } from …;

Default Exports and Re-exports #

Default Exports
Named Exports

Named exports are useful when exporting multiple values. When importing, you must use the same name as the exported value. In contrast, default exports can be imported with any name.
To avoid identifier conflicts, you can also rename named exports.

Named Exports

// 먼저 선언한 식별자 내보내기
export { myFunction, myVariable };

// 각각의 식별자 내보내기
// (변수, 상수, 함수, 클래스)
export let myVariable = Math.sqrt(2);
export function myFunction() { ... };

Default Exports

// 먼저 선언한 식별자 내보내기
export { myFunction as default };

// 각각의 식별자 내보내기
export default function () { ... };
export default class { ... }