Projects/Modules with Esprunio CLI

Should be, yes. I believe it looks in a 'modules' directory for any modules.

eg.

$ cat modules/bar.js 
exports = 42;

$ cat foo.js 
var a = require("bar");
print(a);

$ espruino -d Pixl foo.js
# writes it to RAM

$ espruino -d Pixl --minify foo.js
# writes it to RAM with minification

$ espruino -d Pixl --minify --config MODULE_AS_FUNCTION=true --config SAVE_ON_SEND=1 foo.js
# writes to flash with minified code

You may also have some success with --config PRETOKENISE=true, which will pretokenise code before upload, saving a bit of flash