From 4e3ec478573ede7247fd306cad1ea5bf2d5c9565 Mon Sep 17 00:00:00 2001
From: Yoshiya Hinosawa <stibium121@gmail.com>
Date: Tue, 22 Jun 2021 15:17:44 +0900
Subject: fix(runtime): fix signal promise API (#11069)

---
 runtime/js/40_signals.js | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

(limited to 'runtime/js')

diff --git a/runtime/js/40_signals.js b/runtime/js/40_signals.js
index dfc604759..bf6be1263 100644
--- a/runtime/js/40_signals.js
+++ b/runtime/js/40_signals.js
@@ -236,7 +236,15 @@
       f,
       g,
     ) {
-      return this.#pollingPromise.then(() => {}).then(f, g);
+      return this.#pollingPromise.then((done) => {
+        if (done) {
+          // If pollingPromise returns true, then
+          // this signal stream is finished and the promise API
+          // should never be resolved.
+          return new Promise(() => {});
+        }
+        return;
+      }).then(f, g);
     }
 
     async next() {
-- 
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