Add Serialize & Deserialize to umbrella crate derive module

prdoc/pr_7764.prdoc

@@ -0,0 +1,17 @@
+# Schema: Polkadot SDK PRDoc Schema (prdoc) v1.0.0
+# See doc at https://raw.githubusercontent.com/paritytech/polkadot-sdk/master/prdoc/schema_user.json
+
+title: Add Serialize & Deserialize to umbrella crate derive module
+
+doc:
+  - audience: Runtime Dev
+    description: |
+      This PR adds serde::Serialize and serde::Deserialize to the frame umbrella crate
+      `derive` and indirectly `prelude` modules. They can now be accessed through those.
+      Note: serde will still need to be added as a dependency in consuming crates. That or
+      you'll need to specify th `#[serde(crate = "PATH_TO_SERDE::serde")]` attribute at the
+      location where Serialize/Deserialize are used.
+
+crates:
+- name: polkadot-sdk-frame
+  bump: patch

substrate/frame/Cargo.toml

@@ -24,6 +24,7 @@ codec = { features = [
 scale-info = { features = [
 	"derive",
 ], workspace = true }
+serde = { workspace = true }
 
 # primitive deps, used for developing FRAME pallets.
 sp-arithmetic = { workspace = true }
@@ -95,6 +96,7 @@ std = [
 	"frame-try-runtime?/std",
 	"log/std",
 	"scale-info/std",
+	"serde/std",
 	"sp-api?/std",
 	"sp-arithmetic/std",
 	"sp-block-builder?/std",

substrate/frame/src/lib.rs

@@ -548,6 +548,13 @@ pub mod derive {
 		PartialOrdNoBound, RuntimeDebugNoBound,
 	};
 	pub use scale_info::TypeInfo;
+	pub use serde;
+	/// The `serde` `Serialize`/`Deserialize` derive macros and traits.
+	///
+	/// You will either need to add `serde` as a dependency in your crate's `Cargo.toml`
+	/// or specify the `#[serde(crate = "PATH_TO_THIS_CRATE::serde")]` attribute that points
+	/// to the path where serde can be found.
+	pub use serde::{Deserialize, Serialize};
 	pub use sp_runtime::RuntimeDebug;
 }