node.js module.exports & exports & module.export all in one

cjs

const log = console.log;

log(`exports`, exports);

log(`module`, module);

// TypeError: Cannot set property 'a' of undefined

// module.export.a = 1;

// module.export.b = 2;

// module.export.c = 3;

// module.export.d = 4;

// 自定义属性 umd

module.umd = {

  a: 1,

  b: 2,

  c: 3,

  d: 4,

};

// 自定义属性 export

module.export = {

  a: 1,

  b: 2,

  c: 3,

  d: 4,

};

exports.a = 11;

exports.b = 22;

exports.c = 33;

exports.d = 44;

// module.exports 覆盖 exports

module.exports = { c: 333 };

module.exports.d = 444;

log(`\nexports`, exports);

log(`module`, module);

/*

exports { a: 11, b: 22, c: 33, d: 44 }

module Module {

  id: '.',

  path: '/Users/xgqfrms-mbp/Documents/GitHub/umd-npm-package/src',

  exports: { c: 333, d: 444 },

  parent: null,

  filename: '/Users/xgqfrms-mbp/Documents/GitHub/umd-npm-package/src/export.js',

  loaded: false,

  children: [],

  paths: [

    '/Users/xgqfrms-mbp/Documents/GitHub/umd-npm-package/src/node_modules',

    '/Users/xgqfrms-mbp/Documents/GitHub/umd-npm-package/node_modules',

    '/Users/xgqfrms-mbp/Documents/GitHub/node_modules',

    '/Users/xgqfrms-mbp/Documents/node_modules',

    '/Users/xgqfrms-mbp/node_modules',

    '/Users/node_modules',

    '/node_modules'

  ],

  umd: { a: 1, b: 2, c: 3, d: 4 },

  export: { a: 1, b: 2, c: 3, d: 4 }

}

*/

module.exports vs exports

const log = console.log;

const app = (datas = [], debug = false) => {

  log(`args =`, datas);

};

const test = `abc`;

//  default export (const app = require(`./app`);)

module.exports = app;

module.exports.test = test;

//

// module.exports.app = app;

//

// module.exports = {

//   app,

// };

log(`exports =`, exports);

log(`module.exports =`, module.exports);

// exports = {}

// module.exports = [Function: app] { test: 'abc' }

// log(`module`, module);

const log = console.log;

//  import default module

const app = require(`./app`);

// const app, {test} = require(`./app`);

log(`\napp =`, app, app.app);

app();

// app = [Function: app] undefined

// args = []

log(`test =`, app.test);

// test = abc

const log = console.log;

const app = (datas = [], debug = false) => {

  log(`args =`, datas);

};

const test = `abc`;

//

// exports = app;

//  module export (const { app, } = require(`./app`);)

exports.app = app;

exports.test = test;

log(`exports =`, exports);

log(`module.exports =`, module.exports);

// exports = { app: [Function: app], test: 'abc' }

// module.exports = { app: [Function: app], test: 'abc' }

// log(`module`, module);

const log = console.log;

//  imports multi modules

const { app, test, } = require(`./app`);

log(`\napp =`, app);

app();

// app = [Function: app]

// args = []

log(`test =`, test);

// test = abc

exports = module.exports

module.exports 与 exports 指向同一个Object 引用

https://blog.tableflip.io/the-difference-between-module-exports-and-exports

"use strict";

/**

 *

 * @author xgqfrms

 * @license MIT

 * @copyright xgqfrms

 * @created 2020-10-01

 * @modified

 *

 * @description

 * @difficulty Easy Medium Hard

 * @complexity O(n)

 * @augments

 * @example

 * @link

 * @solutions

 *

 * @best_solutions

 *

 */

const log = console.log;

//  module.exports 与 exports 指向同一个Object 引用

// SyntaxError: Identifier 'module' has already been declared

// module = {

//   exports: {},

//   //others

// };

// // {exports: {…}}

// module.exports;

// // {}

// exports = module.exports;

// // {}

// exports.a = `a`;

// module.exports.a = `aa`;

// module.exports.b = `b`;

// log(`exports =`, exports);

// log(`module.exports =`, module.exports);

/*

exports = { a: 'aa', b: 'b' }

module.exports = { a: 'aa', b: 'b' }

*/

const test = () => {

  const module = {

    exports: {},

    //others

  };

  // {exports: {…}}

  module.exports;

  // {}

  const exports = module.exports;

  // {}

  exports.a = `a`;

  module.exports.a = `aa`;

  module.exports.b = `b`;

  log(`exports =`, exports);

  log(`module.exports =`, module.exports);

}

test();

/*

exports = { a: 'aa', b: 'b' }

module.exports = { a: 'aa', b: 'b' }

*/

refs

https://gist.github.com/xgqfrms/b69677e524d4c4e154fef6342914eb00

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