readme.md

בדיקת טעינה מחדש של מודולים

class-to-reload.js

const { writeFile, readFile } = require("fs").promises;

module.exports = {
	Class,
	sleep,
	change_file
};

function Class() {

	let interval;

	this.start = () => {

		let i = 1;

		const text = "first text"; // "last text"

		interval = setInterval(() => {
			console.log(i + " " + text);
			i++;
		}, 500);
	};

	this.stop = () => {
		clearInterval(interval);
	};
}


function sleep(ms) {
	return new Promise((resolve) => setTimeout(resolve, ms));
}

async function change_file(path, fn) {

	const script_text = await readFile(path, "utf-8");

	const new_script_text = fn(script_text);

	await writeFile(path, new_script_text, "utf-8");
}

index.js

const { join } = require("path");

const script = join(__dirname, "class-to-reload.js");

(async function main() {

	let { Class, sleep, change_file } = require(script);

	console.log("start...");

	let the_class = new Class();

	the_class.start();

	await sleep(1000 * 2);

	console.log("change script file...");

	await change_file(script, (script_text) =>
		script_text.replace("\"first text\"", "\"last text\"")
	);
	
	// https://stackoverflow.com/a/11477602/12054906
	delete require.cache[require.resolve(script)];

	Class = require(script).Class;

	await sleep(1000 * 2);

	console.log("stop!");

	the_class.stop();

	the_class = new Class();

	the_class.start();

	await sleep(1000 * 5);

	console.log("stop!");

	the_class.stop();

	console.log("re change script file...");

	await change_file(script, (script_text) =>
		script_text.replace("\"last text\"", "\"first text\"")
	);

})();