Angular 2 is not updating the UI when making changes to a variable/model in Node

That's probably caused by fs.readdir. It seems it is using an API that is not patched by Angulars zone. To work around you can use

export class FilesComponent {
   constructor(private cdRef:ChangeDetectorRef) {}

   loadFiles() {
     fs.readdir(this.cwd, (err, dir) => {
        for (let filePath of dir) {
            console.log(filePath);
            this.files.push(filePath);
        }
        this.cdRef.detectChanges();
     });
   }
}