From c7c7b6c05e1b156a76fa69042fdfb498981d632b Mon Sep 17 00:00:00 2001
From: Tim Smart <hello@timsmart.co>
Date: Wed, 29 Jul 2026 09:39:24 +1200
Subject: [PATCH 1/2] Add Deno services aggregate

---
 .changeset/eff-145-deno-services.md        |  5 +++
 packages/platform-deno/src/DenoServices.ts | 49 ++++++++++++++++++++++
 packages/platform-deno/src/index.ts        |  5 +++
 3 files changed, 59 insertions(+)
 create mode 100644 .changeset/eff-145-deno-services.md
 create mode 100644 packages/platform-deno/src/DenoServices.ts

diff --git a/.changeset/eff-145-deno-services.md b/.changeset/eff-145-deno-services.md
new file mode 100644
index 00000000000..c9ef160845e
--- /dev/null
+++ b/.changeset/eff-145-deno-services.md
@@ -0,0 +1,5 @@
+---
+"@effect/platform-deno": patch
+---
+
+Add the aggregate Deno platform services layer.
diff --git a/packages/platform-deno/src/DenoServices.ts b/packages/platform-deno/src/DenoServices.ts
new file mode 100644
index 00000000000..2539b44bfbc
--- /dev/null
+++ b/packages/platform-deno/src/DenoServices.ts
@@ -0,0 +1,49 @@
+/**
+ * Aggregate Deno platform services layer.
+ *
+ * This module defines the `DenoServices` union and a single `layer` that
+ * provides Deno-backed child process spawning, crypto, filesystem, path, stdio,
+ * and terminal services. Use the layer when a Deno program wants the standard
+ * platform services from one place.
+ *
+ * @since 4.0.0
+ */
+import type { Crypto } from "effect/Crypto"
+import type { FileSystem } from "effect/FileSystem"
+import * as Layer from "effect/Layer"
+import type { Path } from "effect/Path"
+import type { Stdio } from "effect/Stdio"
+import type { Terminal } from "effect/Terminal"
+import type { ChildProcessSpawner } from "effect/unstable/process/ChildProcessSpawner"
+import * as DenoChildProcessSpawner from "./DenoChildProcessSpawner.ts"
+import * as DenoCrypto from "./DenoCrypto.ts"
+import * as DenoFileSystem from "./DenoFileSystem.ts"
+import * as DenoPath from "./DenoPath.ts"
+import * as DenoStdio from "./DenoStdio.ts"
+import * as DenoTerminal from "./DenoTerminal.ts"
+
+/**
+ * The union of core services provided by the Deno platform layer, including
+ * child process spawning, filesystem, path, stdio, and terminal services.
+ *
+ * @category models
+ * @since 4.0.0
+ */
+export type DenoServices = ChildProcessSpawner | Crypto | FileSystem | Path | Terminal | Stdio
+
+/**
+ * Provides the default Deno implementations for child process spawning,
+ * filesystem, path, stdio, and terminal services.
+ *
+ * @category layers
+ * @since 4.0.0
+ */
+export const layer: Layer.Layer<DenoServices> = DenoChildProcessSpawner.layer.pipe(
+  Layer.provideMerge(Layer.mergeAll(
+    DenoFileSystem.layer,
+    DenoCrypto.layer,
+    DenoPath.layer,
+    DenoStdio.layer,
+    DenoTerminal.layer
+  ))
+)
diff --git a/packages/platform-deno/src/index.ts b/packages/platform-deno/src/index.ts
index 58c78532687..9d15c961a4e 100644
--- a/packages/platform-deno/src/index.ts
+++ b/packages/platform-deno/src/index.ts
@@ -44,6 +44,11 @@ export * as DenoRedis from "./DenoRedis.ts"
  */
 export * as DenoRuntime from "./DenoRuntime.ts"
 
+/**
+ * @since 4.0.0
+ */
+export * as DenoServices from "./DenoServices.ts"
+
 /**
  * @since 4.0.0
  */

From 1086e78cf2337a1a06b7ba32ff5b8d984c2293e4 Mon Sep 17 00:00:00 2001
From: Tim Smart <hello@timsmart.co>
Date: Wed, 29 Jul 2026 09:45:38 +1200
Subject: [PATCH 2/2] Document Deno crypto service

---
 packages/platform-deno/src/DenoServices.ts | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/packages/platform-deno/src/DenoServices.ts b/packages/platform-deno/src/DenoServices.ts
index 2539b44bfbc..17cd7dbefcc 100644
--- a/packages/platform-deno/src/DenoServices.ts
+++ b/packages/platform-deno/src/DenoServices.ts
@@ -24,7 +24,7 @@ import * as DenoTerminal from "./DenoTerminal.ts"
 
 /**
  * The union of core services provided by the Deno platform layer, including
- * child process spawning, filesystem, path, stdio, and terminal services.
+ * child process spawning, crypto, filesystem, path, stdio, and terminal services.
  *
  * @category models
  * @since 4.0.0
@@ -33,7 +33,7 @@ export type DenoServices = ChildProcessSpawner | Crypto | FileSystem | Path | Te
 
 /**
  * Provides the default Deno implementations for child process spawning,
- * filesystem, path, stdio, and terminal services.
+ * crypto, filesystem, path, stdio, and terminal services.
  *
  * @category layers
  * @since 4.0.0