From 956fef182a621cc6c262b606b2cc0c76948e931c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ivan=20=E2=80=9CCLOVIS=E2=80=9D=20Canet?=
 <ivan.canet@gmail.com>
Date: Thu, 7 Aug 2025 21:39:58 +0200
Subject: [PATCH] feat(weak): Support WasmJS

---
 weak/build.gradle.kts                        |  5 ++
 weak/src/wasmJsMain/kotlin/WeakMap.wasmjs.kt | 38 +++++++++++++
 weak/src/wasmJsMain/kotlin/WeakRef.wasmjs.kt | 56 ++++++++++++++++++++
 3 files changed, 99 insertions(+)
 create mode 100644 weak/src/wasmJsMain/kotlin/WeakMap.wasmjs.kt
 create mode 100644 weak/src/wasmJsMain/kotlin/WeakRef.wasmjs.kt

diff --git a/weak/build.gradle.kts b/weak/build.gradle.kts
index 7d5c7c6..ac9b313 100644
--- a/weak/build.gradle.kts
+++ b/weak/build.gradle.kts
@@ -41,6 +41,11 @@ kotlin {
 	tvosArm64()
 	tvosSimulatorArm64()
 	mingwX64()
+	@Suppress("OPT_IN_USAGE")
+	wasmJs {
+		browser()
+		nodejs()
+	}
 
 	sourceSets.jsMain.dependencies {
 		implementation(libs.kotlinJs)
diff --git a/weak/src/wasmJsMain/kotlin/WeakMap.wasmjs.kt b/weak/src/wasmJsMain/kotlin/WeakMap.wasmjs.kt
new file mode 100644
index 0000000..e1251e4
--- /dev/null
+++ b/weak/src/wasmJsMain/kotlin/WeakMap.wasmjs.kt
@@ -0,0 +1,38 @@
+/*
+ * Copyright (c) 2025, OpenSavvy and contributors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package opensavvy.pedestal.weak
+
+import opensavvy.pedestal.weak.algorithms.WeakKeyArrayMap
+
+/**
+ * Instantiates a new, empty [WeakMap].
+ *
+ * This implementation uses [WeakKeyArrayMap].
+ */
+@ExperimentalWeakApi
+actual fun <K, V> WeakMap(): WeakMap<K, V> =
+	WeakKeyArrayMap()
+
+/**
+ * Instantiates a new [WeakMap] by copying [values].
+ *
+ * This implementation uses [WeakKeyArrayMap].
+ */
+@ExperimentalWeakApi
+actual fun <K, V> WeakMap(values: Map<K, V>): WeakMap<K, V> =
+	WeakKeyArrayMap<K, V>()
+		.also { it.setAll(values) }
diff --git a/weak/src/wasmJsMain/kotlin/WeakRef.wasmjs.kt b/weak/src/wasmJsMain/kotlin/WeakRef.wasmjs.kt
new file mode 100644
index 0000000..e7d95f8
--- /dev/null
+++ b/weak/src/wasmJsMain/kotlin/WeakRef.wasmjs.kt
@@ -0,0 +1,56 @@
+/*
+ * Copyright (c) 2025, OpenSavvy and contributors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package opensavvy.pedestal.weak
+
+import opensavvy.pedestal.weak.algorithms.EmptyWeakRef
+
+@JsName("WeakRef")
+private external class JsWeakRef {
+	constructor(target: JsAny)
+
+	fun deref(): JsAny?
+}
+
+private class WrappedWeakRef<T : Any>(
+	target: T,
+) : WeakRef<T> {
+	val js = JsWeakRef(target.toJsReference())
+
+	override fun read(): T? =
+		js.deref()?.unsafeCast<JsReference<T>>()?.get()
+
+	override fun toString() =
+		js.toString()
+}
+
+/**
+ * Implementation of [WeakRef] backed by a JS [WeakRef](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/WeakRef).
+ *
+ * JS doesn't make a difference between weak and soft references.
+ */
+actual fun <T> WeakRef(value: T): WeakRef<T> =
+	if (value == null) EmptyWeakRef()
+	else WrappedWeakRef(value)
+
+/**
+ * Implementation of [WeakRef] backed by a JS [WeakRef](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/WeakRef).
+ *
+ * JS doesn't make a difference between weak and soft references.
+ */
+@Suppress("FunctionName")
+actual fun <T> SoftRef(value: T): WeakRef<T> =
+	WeakRef(value)
-- 
2.51.2