Change terminology. Sketch out Draft Function

src/ui/Digith.tsx

@@ -0,0 +1,29 @@
+import { FunctionName } from "src/lang/expr"
+
+export type Digith =
+  | Digith.Repl
+  | Digith.NewFunctionDraft
+  | Digith.Function
+  
+export namespace Digith {
+  export type Repl = {
+    tag: "repl",
+  }
+
+  export type NewFunctionDraft = {
+    tag: "new-fn-draft",
+    raw_name: string,
+    raw_parameters: string,
+    raw_body: string,
+  }
+
+  export type Function = {
+    tag: "fn",
+    name: FunctionName,
+    raw_parameters: string,
+    raw_body: string,
+    is_loaded: boolean
+  }
+
+}
+