Add nodes with render and transform

src/nodes/EnumNode.ts

@@ -0,0 +1,17 @@
+import { AbstractNode, NodeMods } from './AbstractNode'
+
+export class EnumNode extends AbstractNode<string> {
+  private options: string[]
+
+  constructor(options: string[], mods?: NodeMods<string>) {
+    super(mods)
+    this.options = options
+  }
+
+  render (field: string, value: string) {
+    return `<span>${field}</span>
+    <select value="${value}">
+      ${this.options.map(o => `<option>${o}</option>`)}
+    </select>`
+  }
+}