move app to app/ subdir

app/src/promptConstructor/format.ts

@@ -0,0 +1,31 @@
+import prettier from "prettier/standalone";
+import parserTypescript from "prettier/plugins/typescript";
+
+// @ts-expect-error for some reason missing from types
+import parserEstree from "prettier/plugins/estree";
+
+import * as babel from "@babel/standalone";
+
+export function stripTypes(tsCode: string): string {
+  const options = {
+    presets: ["typescript"],
+    filename: "file.ts",
+  };
+
+  try {
+    const result = babel.transform(tsCode, options);
+    return result.code ?? tsCode;
+  } catch (error) {
+    // console.error("Error stripping types", error);
+    return tsCode;
+  }
+}
+
+export default async function formatPromptConstructor(code: string): Promise<string> {
+  return await prettier.format(stripTypes(code), {
+    parser: "typescript",
+    plugins: [parserTypescript, parserEstree],
+    // We're showing these in pretty narrow panes so let's keep the print width low
+    printWidth: 60,
+  });
+}