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import { EventEmitter } from 'node:events';
import * as fs from 'node:fs/promises';
export class FileWatcher extends EventEmitter {
#path;
#hasWatcher = false;
#lastChange = new Date().getTime();
constructor({ path, ...rest }) {
super(rest);
this.#path = path;
}
async #setupWatcher() {
if (this.#hasWatcher)
return;
this.#hasWatcher = true;
const watcher = fs.watch(this.#path);
for await (const _ of watcher) {
if (new Date() - this.#lastChange > 50) {
this.emit('file-updated');
this.#lastChange = new Date().getTime();
}
}
}
read() {
this.#setupWatcher();
return fs.readFile(this.#path, 'utf8');
}
static fromFileProtocol(url_) {
const url = new URL(url_);
if (url.protocol !== 'file:') {
return;
}
const pathname = url.pathname === '/' ? '' : url.pathname;
const file_path = decodeURIComponent(url.host + pathname);
return new this({ path: file_path });
}
}
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