Espruino on ESP8266 ESP-09 - 1 powerful cm2

...long story short - after digging up the versatile USB-to-Serial: Hurray, it just woks: Espruino 2v00 on the mini ESP8266 ESP-09 - 10x10mm (~3/8..0.393..7/16").

See also sister conversation WebServer and Chirp Sensor (moisture, temperature, light) on ESP-09.

// EspruinoOnESP09Test.js
// after flashing w/ Espruino 2v00 via pico

var wifiCreds = require("wifiCreds");

var wifi = require("Wifi");

function onInit() {
  console.log("Connecting to wifi...");
  wifi.connect(wifiCreds.ssid
      , {password:wifiCreds.pw}, function(err) {
    if (err) {
      console.log('error during connect:',err);
      wifi.disconnect();
    } else {
      console.log('Connected to wifi.');
      wifi.stopAP();
      //wifi.save();
    }
  });
}

setTimeout(onInit,1000);

And console output:

`
>
 ____                 _
|  __|___ ___ ___ _ _|_|___ ___
|  __|_ -| . |  _| | | |   | . |
|____|___|  _|_| |___|_|_|_|___|
         |_| espruino.com
 2v00 (c) 2018 G.Williams
Espruino is Open Source. Our work is supported
only by sales of official boards and donations:
http://espruino.com/Donate
Flash map 1MB:512/512, manuf 0xef chip 0x4014
>
Connecting to wifi...
Connected to wifi.
>process.env
={
  VERSION: "2v00",
  GIT_COMMIT: "ff35517",
  BOARD: "ESP8266_BOARD",
  FLASH: 0, RAM: 81920,
  SERIAL: "18fe349c-153b",
  CONSOLE: "Serial1",
  MODULES: "Flash,Storage,hea" ... "r,crypto,neopixel",
  EXPTR: 1073643636 }
>process.memory()
={ free: 1633, usage: 67, total: 1700, history: 52,
  gc: 0, gctime: 1.397 }
>
`

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