Function transform

test/node.js:58–65

(file, src, opts, done)

test('test function transform with post option', function(t) {
  var transform = function (file, src, opts, done) {
    src = src.toUpperCase();
    if (done) {
      done(null, src);
    } else {
      return src;
    }
  }
  var output = glx([
    '  #pragma glslify: noise = require("glsl-noise/simplex/3d")',
    '  precision mediump float;',