nodemcu, esp8266, ds18s20

works for me with DS18B20 devices - had to add for the esp8266:
A1=NodeMCU.D1;

or my case change to D5: ( wired to different pin)

var t = require("https://raw.githubusercontent.com/espruino/EspruinoDocs/master/devices/DS18B20.js").connect(new OneWire(D5));
t.getTemp(console.log);

WARNING: the esp8266 port is in beta!
Flash map 4MB:512/512, manuf 0xe0 chip 0x4016
>echo(0);
=undefined
25.75
> 

I'll test the callback soon, and have some questions on how this will work multiple sensors.

Can we start a conversion on all sensors, and then have a callback with all temps?

I'm not sure if the current callback identifies the device, I'll set up some test cases.