🈯import

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JS ⟩ module ⟩ ES ⟩ import
JS ⟩ grammar ⟩ declaration ⟩ import

(directive or declaration❓)

4 forms of import declarations:

Named import: import {a, b} from "module";
Default import: import A from "module";
Namespace import: import * as B from "module";
Side effect import: import "module";

import Tools from './module.js';         // import default
import { f, g } from './module.js'; 
import { f as g } from './module.js';    // rename

importing a CommonJS module from npm may cause

⛔ SyntaxError：Named export 'xxx' not found❗