'use strict';

const fs = require('node:fs/promises');

class Logger {

#file = null;

constructor(path) {

return this.#init(path);

}

async #init(path) {

this.#file = await fs.open(path, 'a');

return this;

}

async log(message) {

const timestamp = new Date().toISOString();

const msg = `[${timestamp}] ${message}`;

console.log(msg);

await this.#file.write(`${msg}\n`);

}

async close() {

return this.#file.close();

}

}

const main = async () => {

let logger = null;

try {

// Critical code, exceptions expected

logger = await new Logger('output.log');

await logger.log('Open');

await logger.log('Do something');

} finally {

if (logger !== null) await logger.close();

console.log('File closed (finalized)');

}

};

main();