@sammwy/milkshake/src/utils/watcher.js

<p align="center"> <img src="https://raw.githubusercontent.com/sammwyy/milkshake/master/docs/milkshake.png" height="64px"> <h1 align="center">MilkShake</h1> <p align="center"> <b>Automatize Tasks, Compile, concatenate and minify automaticall

const fs = require("fs");
const path = require("path");

class Watcher {
    constructor () {
        this.events = new Map();
        this.directories = [];
        this.timeouts = new Set();
    }

    emit (eventName, ...args) {
        if (this.timeouts.has(args[0])) {
            return;
        } else {
            this.timeouts.add(args[0]);
            setTimeout(() => {
                this.timeouts.delete(args[0]);
            }, 100 );
        }

        let callbacks = this.events.get(eventName) || [];
        for (let callback of callbacks) {
            callback(...args);
        }
    }

    on (eventName, callback){
        let callbacks = this.events.get(eventName) || [];
        callbacks.push(callback);
        this.events.set(eventName, callbacks);
    }

    watch (directory) {
        if (this.directories.includes(directory)) {
            return;
        } else {
            this.directories.push(directory);
        }

        fs.watch(directory, (eventType, fileName) => {
            setTimeout(() => {
                this.emit("*", directory, fileName);
                this.emit(eventType, directory, fileName)
            }, 100);
        });
    }
}

module.exports = Watcher;