From c0809f46e0ad104adb5157ee869babd97427dec4 Mon Sep 17 00:00:00 2001
From: Ethan Niser <whatplan00@gmail.com>
Date: Mon, 18 Sep 2023 10:29:37 -0500
Subject: [PATCH] make decorates readonly when accessed through context

---
 src/context.ts      |  4 ++--
 test/types/index.ts | 34 ++++++++++++++++++++++++++++++++++
 2 files changed, 36 insertions(+), 2 deletions(-)

diff --git a/src/context.ts b/src/context.ts
index 9762355f..98762e04 100644
--- a/src/context.ts
+++ b/src/context.ts
@@ -65,7 +65,7 @@ export type Context<
 		path: string
 		request: Request
 		store: Decorators['store']
-	} & Decorators['request']
+	} & Readonly<Decorators['request']>
 >
 
 // Use to mimic request before mapping route
@@ -92,5 +92,5 @@ export type PreContext<
 		path: string
 		request: Request
 		store: Decorators['store']
-	} & Decorators['request']
+	} & Readonly<Decorators['request']>
 >
diff --git a/test/types/index.ts b/test/types/index.ts
index b67a5abd..7bbb725a 100644
--- a/test/types/index.ts
+++ b/test/types/index.ts
@@ -854,3 +854,37 @@ app.group(
 				)
 	)
 }
+
+// ? Decorators are Read-Only in context
+{
+	const app = new Elysia()
+		.decorate('a', {
+			b: 'c',
+			d: 54
+		})
+		.decorate('pi', 3.14)
+
+	app.get('/', (ctx) => {
+		type OnlyDecorators = Omit<
+			typeof ctx,
+			| 'params'
+			| 'request'
+			| 'body'
+			| 'headers'
+			| 'query'
+			| 'cookie'
+			| 'set'
+			| 'path'
+			| 'r'
+			| 'store'
+		>
+
+		expectTypeOf<OnlyDecorators>().toEqualTypeOf<{
+			readonly a: {
+				readonly b: 'c'
+				readonly d: 54
+			}
+			readonly pi: 3.14
+		}>()
+	})
+}