xlcyun / defer_require Goto Github PK

// File defer_require.js
class Deferrer {
	#file;
	#data;

	constructor(file) {
		this.#file = file;
	}

	get data() {
		if (!this.#data)
			this.#data = require(this.#file);

		return this.#data;
	}
}

function defer_require(file) {
	return new Proxy(new Deferrer(file), {
		get: (target, prop) => {
			return target.data[prop];
		},
		set: (target, prop, value) => {
			return target.data[prop] = value;
		},
		has: (target, prop) => {
			return prop in target.data;
		},
		// ... and so on
	});
}

module.exports = defer_require;

// File A.js
function add(a, b) {
	return a + b;
}

module.exports = { add };

const {add} = require('defer_require')('A.js');

add(1, 2) // 3