3 files changed, 14 insertions, 5 deletions
diff --git a/cli/dts/lib.deno.unstable.d.ts b/cli/dts/lib.deno.unstable.d.ts
index 3fbf3d94d..612ebeccc 100644
--- a/cli/dts/lib.deno.unstable.d.ts
+++ b/cli/dts/lib.deno.unstable.d.ts
@@ -1166,6 +1166,15 @@ declare namespace Deno {
     bytesReceived: number;
   }
 
+  export interface MemoryUsage {
+    rss: number;
+    heapTotal: number;
+    heapUsed: number;
+    external: number;
+  }
+
+  export function memoryUsage(): MemoryUsage;
+
   export interface RequestEvent {
     readonly request: Request;
     respondWith(r: Response | Promise<Response>): void;
diff --git a/cli/tests/heapstats.js b/cli/tests/heapstats.js
index 0ed623e56..fba9e66d9 100644
--- a/cli/tests/heapstats.js
+++ b/cli/tests/heapstats.js
@@ -2,15 +2,15 @@
 "use strict";
 
 function allocTest(alloc, allocAssert, deallocAssert) {
-  // Helper func that GCs then returns heapStats
+  // Helper func that GCs then returns memory usage
   const sample = () => {
     // deno-lint-ignore no-undef
     gc();
-    return Deno.core.heapStats();
+    return Deno.memoryUsage();
   };
-  const delta = (t1, t2) => t2.usedHeapSize - t1.usedHeapSize;
+  const delta = (t1, t2) => t2.heapUsed - t1.heapUsed;
 
-  // Sample "clean" heapStats
+  // Sample "clean" heap usage
   const t1 = sample();
 
   // Alloc
diff --git a/cli/tests/integration_tests.rs b/cli/tests/integration_tests.rs
index 5067b8163..f856b90b8 100644
--- a/cli/tests/integration_tests.rs
+++ b/cli/tests/integration_tests.rs
@@ -3250,7 +3250,7 @@ console.log("finish");
   });
 
   itest!(heapstats {
-    args: "run --quiet --v8-flags=--expose-gc heapstats.js",
+    args: "run --quiet --unstable --v8-flags=--expose-gc heapstats.js",
     output: "heapstats.js.out",
   });