code snippet 1 : displaying text

import display display.show( display.Text( "Hi from JS", 100, 100, display.GREEN) )
send

output

clear

code snippet 2 : turning on green LED

import led led.on( led.GREEN)
send

code snippet 3 : filesystem

for i in uos.listdir(): print(i) uos.chdir(i) print(uos.listdir()) uos.chdir('..')
Anything before iterations fails, blocks the rest. Seems import uos isn't required.
send

Once connected see myMonocle and to send microPython code use myMonocle.repl('your code')

You can directly use https://monocolejs.glitch.me/monoclejs as a no-build solution.

Based on monocle.ts transformed with Babel and exposing myMonocle.

import device; print(device.battery_level())