fix pipe issue in REPL, add ability to dump top in repl

playground/src/emul.ts

@@ -47,6 +47,9 @@ export let shim: NodeShim = {
     writeFileSync(name: string, data: string, enc?: string) {
       shim.files[name] = new TextEncoder().encode(data)
     },
+    writeSync(fd: number, data: string) {
+      shim.stdout += data;
+    }
   },
   process: {
     argv: ["", ""],

playground/src/main.ts

@@ -484,6 +484,7 @@ const processOutput = (
       let endLineNumber = +eline;
       let endColumn = +ecol
       // FIXME - pass the real path in
+      if (file.startsWith("./")) file = file.slice(2);
       if (fn && fn !== file) {
         startLineNumber = startColumn = 0;
       }