async_hooks: fix Promises with later enabled hooks

Assign a `PromiseWrap` instance to Promises that do not have one
yet when the PromiseHook is being called.

Fixes: #13237

src/async-wrap.cc

@@ -293,13 +293,14 @@ static void PromiseHook(PromiseHookType type, Local<Promise> promise,
                         Local<Value> parent, void* arg) {
   Local<Context> context = promise->CreationContext();
   Environment* env = Environment::GetCurrent(context);
-  if (type == PromiseHookType::kInit) {
-    PromiseWrap* wrap = new PromiseWrap(env, promise);
+  PromiseWrap* wrap = Unwrap<PromiseWrap>(promise);
+  if (type == PromiseHookType::kInit ||
+      wrap == nullptr) {
+    wrap = new PromiseWrap(env, promise);
     wrap->MakeWeak(wrap);
   } else if (type == PromiseHookType::kResolve) {
     // TODO(matthewloring): need to expose this through the async hooks api.
   }
-  PromiseWrap* wrap = Unwrap<PromiseWrap>(promise);
   CHECK_NE(wrap, nullptr);
   if (type == PromiseHookType::kBefore) {
     PreCallbackExecution(wrap, false);

test/parallel/test-async-wrap-promise-after-enabled.js

@@ -0,0 +1,30 @@
+'use strict';
+
+// Regression test for https://github.com/nodejs/node/issues/13237
+
+const common = require('../common');
+const assert = require('assert');
+
+const async_hooks = require('async_hooks');
+
+const seenEvents = [];
+
+const p = new Promise((resolve) => resolve(1));
+p.then(() => seenEvents.push('then'));
+
+const hooks = async_hooks.createHook({
+  before: common.mustCall((id) => {
+    assert.ok(id > 1);
+    seenEvents.push('before');
+  }),
+
+  after: common.mustCall((id) => {
+    assert.ok(id > 1);
+    seenEvents.push('after');
+    hooks.disable();
+  })
+}).enable();
+
+setImmediate(() => {
+  assert.deepStrictEqual(seenEvents, ['before', 'then', 'after']);
+});