Driving WS2811, WS2812 and other NeoPixel devices from ESP8266

I'm running the following code on a string of 8 neopixels. It walks a rainbow of colors. Not seeing any oddity.

var array = [255,255,255, 255,0,0, 0,255,0, 0,0,255, 127,127,127, 0,255,255, 255,0,255, 255,255,0];
function walk() {
  esp.neopixelWrite(D5,array);
  array.push(array.shift());
  array.push(array.shift());
  array.push(array.shift());
}

var esp = require("ESP8266");
pinMode(D5,'output');

setInterval(walk, 500);