Typescript all the parser things

app/imports/parser/map.ts

@@ -0,0 +1,15 @@
+import nodeTypeIndex from './parseTree';
+import ParseNode from '/imports/parser/parseTree/ParseNode';
+
+export default async function map(node: ParseNode, fn: (ParseNode) => Promise<any>): Promise<any> {
+  if (!node) return;
+  const type = nodeTypeIndex[node.parseType];
+  if (!type) {
+    console.error(node);
+    throw new Meteor.Error('Not valid parse node');
+  }
+  if ('map' in type) {
+    return type.map(node as any, fn, map);
+  }
+  return fn(node);
+}