From 0f417867fb439be95c9eea9885034be4cb2f146a Mon Sep 17 00:00:00 2001
From: Julian Schurhammer <julian.schurhammer@gmail.com>
Date: Mon, 13 Mar 2023 10:30:28 +1300
Subject: check that custom hashcode is a number

---
 src/persistent-hash-map.mjs | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

(limited to 'src')

diff --git a/src/persistent-hash-map.mjs b/src/persistent-hash-map.mjs
index bf5ef53..f454c7d 100644
--- a/src/persistent-hash-map.mjs
+++ b/src/persistent-hash-map.mjs
@@ -1,3 +1,8 @@
+/**
+ * This file uses jsdoc to annotate types.
+ * These types can be checked using the typescript compiler with "checkjs" option.
+ */
+
 import { isEqual } from "./gleam.mjs";
 
 const referenceMap = new WeakMap();
@@ -70,7 +75,10 @@ function hashObject(o) {
   const proto = Object.getPrototypeOf(o);
   if (proto !== null && typeof proto.hashCode === "function") {
     try {
-      return o.hashCode(o);
+      const code = o.hashCode(o);
+      if (typeof code === "number") {
+        return code
+      }
     } catch {}
   }
   if (o instanceof Promise || o instanceof WeakSet || o instanceof WeakMap) {
@@ -945,4 +953,3 @@ export default class PMap {
   }
 }
 
-export function __include_me() {}
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