debugger: wait for V8 debugger to be enabled

Refs: nodejs#38273 (comment)

PR-URL: nodejs#38811
Backport-PR-URL: nodejs#39446
Reviewed-By: Antoine du Hamel <[email protected]>
Reviewed-By: Richard Lau <[email protected]>
Reviewed-By: Beth Griggs <[email protected]>
Reviewed-By: Gerhard Stöbich <[email protected]>
Reviewed-By: Rich Trott <[email protected]>

Author: targos

lib/internal/inspector/_inspect.js

@@ -203,8 +203,8 @@ class NodeInspector {
     process.once('SIGTERM', exitCodeZero);
     process.once('SIGHUP', exitCodeZero);
 
-    PromisePrototypeCatch(PromisePrototypeThen(this.run(), () => {
-      const repl = startRepl();
+    PromisePrototypeCatch(PromisePrototypeThen(this.run(), async () => {
+      const repl = await startRepl();
       this.repl = repl;
       this.repl.on('exit', exitCodeZero);
       this.paused = false;

lib/internal/inspector/inspect_repl.js

@@ -1077,14 +1077,17 @@ function createRepl(inspector) {
       .then(() => Runtime.runIfWaitingForDebugger());
   }
 
-  return function startRepl() {
+  return async function startRepl() {
     inspector.client.on('close', () => {
       resetOnStart();
     });
     inspector.client.on('ready', () => {
       initAfterStart();
     });
 
+    // Init once for the initial connection
+    await initAfterStart();
+
     const replOptions = {
       prompt: 'debug> ',
       input: inspector.stdin,
@@ -1103,9 +1106,6 @@ function createRepl(inspector) {
       repl.emit('SIGINT');
     });
 
-    // Init once for the initial connection
-    initAfterStart();
-
     return repl;
   };
 }