Refactor FileService class to use event emitter module for better code organization and readability

src/services/file.js

@@ -1,24 +1,24 @@
-const EventEmitter = require('events');
 const csv = require('csv-parser');
 
 const File = require('../models/File');
+const emitter = require('./eventEmitter');
 
 // Create a class FileService that extends EventEmitter
-class FileService extends EventEmitter {
+class FileService {
 
 
   async parseFromUrl(url, columns) {
-    this.emit('parseFromUrl.start', { url, columns });
+    emitter.emit('parseFromUrl.start', { url, columns });
 
     // Check if url is valid
     if (!url) {
-      this.emit('parseFromUrl.error', { url, columns, error: 'Invalid url' });
+      emitter.emit('parseFromUrl.error', { url, columns, error: 'Invalid url' });
       return Promise.reject(new Error('Invalid url'));
     }
 
     // Check columns
     if (!columns || !Array.isArray(columns) || columns.length === 0) {
-      this.emit('parseFromUrl.error', { url, columns, error: 'Invalid columns' });
+      emitter.emit('parseFromUrl.error', { url, columns, error: 'Invalid columns' });
       return Promise.reject(new Error('Invalid columns'));
     }
 
@@ -28,11 +28,11 @@ class FileService extends EventEmitter {
 
     const stream = file.parse(columns);
     if ( !stream ) {
-      this.emit('parseFromUrl.error', { url, columns, error: 'Invalid stream' });
+      emitter.emit('parseFromUrl.error', { url, columns, error: 'Invalid stream' });
       return Promise.reject(new Error('Invalid stream'));
     }
 
-    this.emit('parseFromUrl.end', { url, columns, filepath });
+    emitter.emit('parseFromUrl.end', { url, columns, filepath });
     return Promise.resolve(stream);
   }
 }