fix(deps): make dependencies used only in feature-gated modules optional

- r402-svm: make `serde_json` and `tokio` optional; gate behind client/server/facilitator features; remove unused `solana-keypair` dev-dependency
- r402-evm: make `alloy-sol-types` optional; gate behind client and facilitator features
- r402-http: make `r402`, `serde_json`, and `thiserror` optional; gate behind client/server/telemetry features; add `use-as-underscore` for `tokio` and `wiremock` dev-dependencies

Resolves `unused-crate-dependencies` errors when `-D warnings` is enabled.

Author: gitctrlx

r402-evm/Cargo.toml

@@ -12,7 +12,7 @@ all-features = true
 [features]
 default = []
 telemetry = ["dep:tracing", "dep:tracing-core", "r402/telemetry"]
-client = ["dep:alloy-signer", "dep:alloy-signer-local", "dep:rand"]
+client = ["dep:alloy-signer", "dep:alloy-signer-local", "dep:alloy-sol-types", "dep:rand"]
 client-provider = ["client", "dep:alloy-provider", "dep:alloy-rpc-types-eth"]
 server = []
 facilitator = [
@@ -23,6 +23,7 @@ facilitator = [
     "dep:alloy-rpc-types-eth",
     "dep:alloy-signer",
     "dep:alloy-signer-local",
+    "dep:alloy-sol-types",
     "dep:alloy-transport",
     "dep:alloy-transport-http",
     "dep:async-trait",
@@ -35,7 +36,7 @@ full = ["telemetry", "client", "client-provider", "server", "facilitator"]
 
 [dependencies]
 alloy-primitives = { workspace = true }
-alloy-sol-types = { workspace = true }
+alloy-sol-types = { workspace = true, optional = true }
 r402 = { workspace = true }
 serde = { workspace = true }
 serde_json = { workspace = true }

r402-http/Cargo.toml

@@ -11,15 +11,15 @@ all-features = true
 
 [features]
 default = []
-client = ["dep:async-trait", "dep:http", "dep:reqwest", "dep:reqwest-middleware"]
-server = ["dep:axum-core", "dep:http", "dep:reqwest", "dep:serde", "dep:tokio", "dep:tower", "dep:url"]
-telemetry = ["dep:tracing", "r402/telemetry"]
+client = ["dep:async-trait", "dep:http", "dep:r402", "dep:reqwest", "dep:reqwest-middleware", "dep:serde_json"]
+server = ["dep:axum-core", "dep:http", "dep:r402", "dep:reqwest", "dep:serde", "dep:serde_json", "dep:thiserror", "dep:tokio", "dep:tower", "dep:url"]
+telemetry = ["dep:r402", "dep:tracing", "r402/telemetry"]
 full = ["client", "server", "telemetry"]
 
 [dependencies]
-r402 = { workspace = true }
-serde_json = { workspace = true }
-thiserror = { workspace = true }
+r402 = { workspace = true, optional = true }
+serde_json = { workspace = true, optional = true }
+thiserror = { workspace = true, optional = true }
 
 async-trait = { workspace = true, optional = true }
 axum-core = { workspace = true, optional = true }

r402-http/src/lib.rs

@@ -11,6 +11,11 @@
 //! - `client` — reqwest-middleware for automatic 402 handling
 //! - `telemetry` — Tracing instrumentation
 
+#[cfg(test)]
+use tokio as _;
+#[cfg(test)]
+use wiremock as _;
+
 #[cfg(feature = "server")]
 pub mod server;
 

r402-svm/Cargo.toml

@@ -14,6 +14,7 @@ default = []
 telemetry = ["dep:tracing", "dep:tracing-core", "r402/telemetry"]
 client = [
     "dep:bincode",
+    "dep:serde_json",
     "dep:solana-account",
     "dep:solana-client",
     "dep:solana-commitment-config",
@@ -25,10 +26,11 @@ client = [
     "dep:spl-token",
     "dep:spl-token-2022",
 ]
-server = []
+server = ["dep:serde_json"]
 facilitator = [
     "dep:bincode",
     "dep:futures-util",
+    "dep:serde_json",
     "dep:solana-account",
     "dep:solana-client",
     "dep:solana-commitment-config",
@@ -40,16 +42,17 @@ facilitator = [
     "dep:solana-transaction",
     "dep:spl-token",
     "dep:spl-token-2022",
+    "dep:tokio",
 ]
 full = ["telemetry", "client", "server", "facilitator"]
 
 [dependencies]
 r402 = { workspace = true }
 serde = { workspace = true }
-serde_json = { workspace = true }
+serde_json = { workspace = true, optional = true }
 solana-pubkey = { workspace = true }
 thiserror = { workspace = true }
-tokio = { workspace = true }
+tokio = { workspace = true, optional = true }
 
 bincode = { workspace = true, optional = true }
 futures-util = { workspace = true, optional = true }
@@ -67,8 +70,5 @@ spl-token-2022 = { workspace = true, optional = true }
 tracing = { workspace = true, optional = true }
 tracing-core = { workspace = true, optional = true }
 
-[dev-dependencies]
-solana-keypair = { workspace = true }
-
 [lints]
 workspace = true