a bit confused

[sonnyp]

you should be able to run './src/my-js-app' and stuff should just work
-- https://github.com/gcampax/gtk-js-app/blob/master/README

% ./src/my-js-app                                                                                                                                                                 
no such file or directory: ./src/my-js-app

Ok let's try gjs.

 % gjs ./src/main.js                                                                                                                                                               
(gjs:1281): Gjs-WARNING **: 15:27:19.845: JS ERROR: ReferenceError: pkg is not defined
@./src/main.js:27:1
Script ./src/main.js threw an exception

Ok let's build this

% meson build
[....]

% ./build/src/com.example.Gtk.JSApplication 
permission denied: ./build/src/com.example.Gtk.JSApplication

% chmod +x ./build/src/com.example.Gtk.JSApplication
                                                                                                                        
% ./build/src/com.example.Gtk.JSApplication
(com.example.Gtk.JSApplication:1424): Gjs-WARNING **: 15:28:32.957: JS ERROR: ImportError: No JS module 'main' found in search path
@./build/src/com.example.Gtk.JSApplication:6:1
Script ./build/src/com.example.Gtk.JSApplication threw an exception

Ok let's install this

% cd build
% DESTDIR=./install ninja install
% ./install/usr/local/bin/com.example.Gtk.JSApplication
(com.example.Gtk.JSApplication:2282): Gjs-WARNING **: 15:35:38.003: JS ERROR: ImportError: No JS module 'main' found in search path
@./install/usr/local/bin/com.example.Gtk.JSApplication:6:1

Script ./install/usr/local/bin/com.example.Gtk.JSApplication threw an exception

[sonnyp]

ok I was able to build/install/run using

cd gtk-js-app
meson --prefix $PWD/install build
ninja -C build install
./install/bin/com.example.Gtk.JSApplication

But I was under the impression there was no need for building to hack this, am I missing something?