export

export { name1, name2, , nameN };
export { variable1 as name1, variable2 as name2, , nameN };
export let name1, name2, , nameN; // tambin var
export let name1 = , name2 = , , nameN; // tambin var, const
export function FunctionName(){...}
export class ClassName {...}

export default expression;
export default function () {  } // tambin class, function*
export default function name1() {  } // tambin class, function*
export { name1 as default,  };

export * from ;
export { name1, name2, , nameN } from ;
export { import1 as name1, import2 as name2, , nameN } from ;
export { default } from ;

export default (k = 12); // en el archivo test.js

import m from "./test"; // notese que tenemos la libertad de usar import m en lugar de import k, porque k era el export por defecto

console.log(m); // escribir 12

export * from ;

import mod from "mod";
export default mod;

// module "my-module.js"
function cube(x) {
  return x * x * x;
}
const foo = Math.PI + Math.SQRT2;
var graph = {
  options: {
    color: "white",
    thickness: "2px",
  },
  draw: function () {
    console.log("From graph draw function");
  },
};
export { cube, foo, graph };

//You should use this script in html with the type module ,
//eg ''<script type="module" src="demo.js"></script>",
//open the page in a httpserver,otherwise there will be a CORS policy error.
//script demo.js

import { cube, foo, graph } from "my-module";
graph.options = {
  color: "blue",
  thickness: "3px",
};
graph.draw();
console.log(cube(3)); // 27
console.log(foo); // 4.555806215962888

// module "my-module.js"
export default function cube(x) {
  return x * x * x;
}

import cube from "my-module";
console.log(cube(3)); // 27