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// ace.js
function edit(el, options): Editor {
  // ...
  var editor = new Editor(new Renderer(el), doc, options);
  // env 可用于调试
  editor.container.env = editor.env = env;
}

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// vertual_renderer.js
var VirtualRenderer = function(container, theme) {
  this.container = container || dom.createElement("div");

  this.$gutter = dom.createElement("div");
  this.scroller = dom.createElement("div");
  this.content = dom.createElement("div");

  this.$gutterLayer = new GutterLayer(this.$gutter);
  this.$markerBack = new MarkerLayer(this.content);
  this.$textLayer = new TextLayer(this.content);
  this.$markerFront = new MarkerLayer(this.content);
  this.$cursorLayer = new CursorLayer(this.content);
}

(function() {
  // ...
}).call(VirtualRenderer.prototype);

config.defineOptions(VirtualRenderer.prototype, "renderer", {
  // ...
});