ES6 Module Syntax Table

export-syntax.js

// default exports
export default 42;
export default {};
export default [];
export default foo;
export default function () {}
export default class {}
export default function foo () {}
export default class foo {}

// variables exports
export var foo = 1;
export var foo = function () {};
export var bar; // lazy initialization
export let foo = 2;
export let bar; // lazy initialization
export const foo = 3;
export function foo () {}
export class foo {}

// named exports
export {foo};
export {foo, bar};
export {foo as bar};
export {foo as default};
export {foo as default, bar};

// exports from
export * from "foo";
export {foo} from "foo";
export {foo, bar} from "foo";
export {foo as bar} from "foo";
export {foo as default} from "foo";
export {foo as default, bar} from "foo";
export {default} from "foo";
export {default as foo} from "foo";

import-syntax.js

// default imports
import foo from "foo";
import {default as foo} from "foo";

// named imports
import {bar} from "foo";
import {bar, baz} from "foo";
import {bar as baz} from "foo";
import {bar as baz, xyz} from "foo";

// glob imports
import * as foo from "foo";

// mixing imports
import foo, {baz as xyz} from "foo";
import * as bar, {baz as xyz} from "foo";
import foo, * as bar, {baz as xyz} from "foo";

invalid-syntax.js

export const bar;
// const variables must have an initializer

export foo;
// Unexpected token identifier, invalid named export syntax

export function () {}
// Unexpected token (, use a function declaration instead

export function default () {}
// Unexpected token default

import foo;
// Missing from after import

import { foo, bar };
// Missing from after import

import foo from bar;
// Invalid module specifier

import default from "foo";
// Unexpected token default

export default from "foo";
// Unexpected token from

export {default};
// Missing from after export

export *;
// Missing from after export

import {default as foo};
// Missing from after import

import * from "foo";
// Missing as after import *'

export default = 42;
// Unexpected token =

import {bar as default} from "foo";
// Unexpected token default