🈯export

🚧 under construction

• JS ⟩ module ⟩ ES ⟩ export

• JS ⟩ grammar ⟩ declaration ⟩ export

(directive or declaration❓)

Every module can have two different types of export, named export and default export. You can have multiple named exports per module but only one default export.

export { PI, TAU };                      // named exports
export default class SomeClass { ... }   // default export

⭐️ 重點

Export declarations are not subject to temporal dead zone rules. You can declare that the module exports X before the name X itself is declared.

export { x };    // export before declaration (it's OK)
const x = 1;

🔴 主題

• named export

• default export

👥 相關

• import

• module

• ⛔ SyntaxError：Named export 'xxx' not found❗

📗 參考

• JavaScript: The Definitive Guide ⟩

  • 5.7.4 import and export

  • 10.3

📘 手冊

• export