Node.js & module.exports & exports All In One

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收起

Node.js & module.exports & exports All In One

exports & module.exports

1. Functions and objects are added to the root of a module by specifying additional properties on the special exports object.

module.exports & exports

CJS Modules

// CJS Modules

/*
exports.a = 1;
exports.b = 2;
exports.c = 3;
exports.d = 4;

// exports = { a: 1, b: 2, c: 3, d: 4 }

 */


exports.a = 1;
exports.b = 2;
module.exports = { c: 3 };
module.exports.d = 4;

// module.exports = { c: 3, d: 4 }

conclusion

module.exports 🚀

1. exports just shorthand of module.exports 👻

2. if exist both exports & module.exports, module.exports will be overwritten exports ⚠️

3. best practice, just using module.exports as possible as you can ✅

exports.a = 1;
exports.b = 2;
module.exports = { c: 3 };
module.exports.d = 4;

// module.exports = { c: 3, d: 4 }

console.log(module);

exports.a = 1;
exports.b = 2;
module.exports = { c: 3 };
module.exports.d = 4;

// module.exports = { c: 3, d: 4 }

module.exports.hello = true; // Exported from require of module
exports = { hello: false };  // Not exported, only available in the module

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

结论

Exports 只是 module.exports 的简写 👻

如果同时存在exports和module.exports，则module.exports将被覆盖exports⚠️

最佳实践，尽可能使用 module.exports

demos

refs

https://www.cnblogs.com/xgqfrms/p/9493550.html

https://www.sitepoint.com/understanding-module-exports-exports-node-js#whatsthedifferencebetweenmoduleexportsandexports

https://www.hacksparrow.com/nodejs/exports-vs-module-exports.html

https://www.freecodecamp.org/news/node-js-module-exports-vs-exports-ec7e254d63ac/

https://www.w3schools.com/nodejs/nodejs_modules.asp

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