improve initial loading + wait before eval

packages/core/repl.mjs

@@ -41,7 +41,7 @@ export function repl({
       throw new Error('no code to evaluate');
     }
     try {
-      beforeEval?.({ code });
+      await beforeEval?.({ code });
       scheduler.setCps(1); // reset cps in case the code does not contain a setCps call
       // problem: when the code does contain a setCps after an awaited promise,
       // the cps will be 1 until the promise resolves

packages/react/src/hooks/useStrudel.mjs

@@ -46,9 +46,9 @@ function useStrudel({
         drawContext,
         transpiler,
         editPattern,
-        beforeEval: ({ code }) => {
+        beforeEval: async ({ code }) => {
           setCode(code);
-          beforeEval?.();
+          await beforeEval?.();
         },
         afterEval: (res) => {
           const { pattern: _pattern, code } = res;