Add a test

package.json

@@ -32,6 +32,7 @@
     "coveralls": "^3.0.9",
     "eslint-config-xo-overrides": "^1.4.0",
     "husky": "^7.0.4",
+    "mem": "^8",
     "nyc": "^15.0.0",
     "xo": "^0.47.0"
   },

src/index.test.ts

@@ -5,6 +5,7 @@ import v8 from 'v8';
 import type { ExecutionContext, Macro } from 'ava';
 import test from 'ava';
 
+import mem from 'mem';
 import DeepWeakMap from '.';
 
 const iterations = 2 ** 21;
@@ -182,3 +183,26 @@ test.serial('DeepWeakMap types', t => {
 		name: 'TypeError',
 	});
 });
+
+test.serial('Integration with mem', t => {
+	type A = { a: number };
+	type B = { b: number };
+
+	type Value = { value: number };
+
+	let callCount = 0;
+	const f = mem((a: A, b: B): Value => ({
+		value: a.a + b.b + callCount++,
+	}), {
+		cacheKey: arguments_ => arguments_,
+		cache: new DeepWeakMap(),
+	});
+
+	const a0 = { a: 0 };
+	const b0 = { b: 0 };
+
+	t.is(f(a0, b0).value, 0);
+	t.is(f(a0, b0).value, 0);
+
+	t.is(callCount, 1);
+});

yarn.lock

@@ -2905,7 +2905,7 @@ md5-hex@^3.0.1:
   dependencies:
     blueimp-md5 "^2.10.0"
 
-mem@^8.0.0:
+mem@^8, mem@^8.0.0:
   version "8.1.1"
   resolved "https://registry.yarnpkg.com/mem/-/mem-8.1.1.tgz#cf118b357c65ab7b7e0817bdf00c8062297c0122"
   integrity sha512-qFCFUDs7U3b8mBDPyz5EToEKoAkgCzqquIgi9nkkR9bixxOVOre+09lbuH7+9Kn2NFpm56M3GUWVbU2hQgdACA==