Node.js & module.exports & exports

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

exports & module.exports

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

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 }

结论

exports just shorthand of module.exports
if exist both exports & module.exports, module.exports will be overwritten exports ️
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);