From a137a0e9860d2b58af86a690b91119377dbc9d54 Mon Sep 17 00:00:00 2001
From: Meghan Denny <meghan@bun.sh>
Date: Wed, 16 Apr 2025 18:34:31 -0800
Subject: [PATCH] types: add bun:jsc HeapStats and MemoryUsage interfaces
 (#19071)

---
 packages/bun-types/jsc.d.ts | 40 ++++++++++++++++++++-----------------
 1 file changed, 22 insertions(+), 18 deletions(-)

diff --git a/packages/bun-types/jsc.d.ts b/packages/bun-types/jsc.d.ts
index 2a07534586..56128914e4 100644
--- a/packages/bun-types/jsc.d.ts
+++ b/packages/bun-types/jsc.d.ts
@@ -8,24 +8,8 @@ declare module "bun:jsc" {
   function fullGC(): number;
   function edenGC(): number;
   function heapSize(): number;
-  function heapStats(): {
-    heapSize: number;
-    heapCapacity: number;
-    extraMemorySize: number;
-    objectCount: number;
-    protectedObjectCount: number;
-    globalObjectCount: number;
-    protectedGlobalObjectCount: number;
-    objectTypeCounts: Record<string, number>;
-    protectedObjectTypeCounts: Record<string, number>;
-  };
-  function memoryUsage(): {
-    current: number;
-    peak: number;
-    currentCommit: number;
-    peakCommit: number;
-    pageFaults: number;
-  };
+  function heapStats(): HeapStats;
+  function memoryUsage(): MemoryUsage;
   function getRandomSeed(): number;
   function setRandomSeed(value: number): void;
   function isRope(input: string): boolean;
@@ -78,6 +62,26 @@ declare module "bun:jsc" {
    */
   function setTimeZone(timeZone: string): string;
 
+  interface HeapStats {
+    heapSize: number;
+    heapCapacity: number;
+    extraMemorySize: number;
+    objectCount: number;
+    protectedObjectCount: number;
+    globalObjectCount: number;
+    protectedGlobalObjectCount: number;
+    objectTypeCounts: Record<string, number>;
+    protectedObjectTypeCounts: Record<string, number>;
+  }
+
+  interface MemoryUsage {
+    current: number;
+    peak: number;
+    currentCommit: number;
+    peakCommit: number;
+    pageFaults: number;
+  }
+
   interface SamplingProfile {
     /**
      * A formatted summary of the top functions