Remove unused deps (#2455)

# Objective

Reduce compilation time

# Solution

Remove unused dependencies. While this PR doesn't remove any crates from `Cargo.lock`, it may unlock more build parallelism.

crates/bevy_app/Cargo.toml

@@ -14,7 +14,7 @@ keywords = ["bevy"]
 
 [features]
 trace = []
-bevy_ci_testing = ["ron"]
+bevy_ci_testing = ["serde", "ron"]
 default = ["bevy_reflect"]
 
 [dependencies]
@@ -25,7 +25,7 @@ bevy_reflect = { path = "../bevy_reflect", version = "0.5.0", optional = true }
 bevy_utils = { path = "../bevy_utils", version = "0.5.0" }
 
 # other
-serde = { version = "1.0", features = ["derive"] }
+serde = { version = "1.0", features = ["derive"], optional = true }
 ron = { version = "0.6.2", optional = true }
 
 

crates/bevy_asset/Cargo.toml

@@ -28,7 +28,6 @@ bevy_utils = { path = "../bevy_utils", version = "0.5.0" }
 
 # other
 serde = { version = "1", features = ["derive"] }
-ron = "0.6.2"
 crossbeam-channel = "0.5.0"
 anyhow = "1.0"
 thiserror = "1.0"

crates/bevy_derive/Cargo.toml

@@ -19,6 +19,5 @@ proc-macro = true
 bevy_macro_utils = { path = "../bevy_macro_utils", version = "0.5.0" }
 
 Inflector = { version = "0.11.4", default-features = false }
-proc-macro2 = "1.0"
 quote = "1.0"
 syn = "1.0"

crates/bevy_derive/src/shader_defs.rs

@@ -1,7 +1,6 @@
 use bevy_macro_utils::BevyManifest;
 use inflector::Inflector;
 use proc_macro::TokenStream;
-use proc_macro2::Ident;
 use quote::quote;
 use syn::{parse_macro_input, Data, DataStruct, DeriveInput, Fields, Path};
 
@@ -27,7 +26,7 @@ pub fn derive_shader_defs(input: TokenStream) -> TokenStream {
                 .any(|a| *a.path.get_ident().as_ref().unwrap() == SHADER_DEF_ATTRIBUTE_NAME)
         })
         .map(|f| f.ident.as_ref().unwrap())
-        .collect::<Vec<&Ident>>();
+        .collect::<Vec<&syn::Ident>>();
     let struct_name = &ast.ident;
     let struct_name_pascal_case = ast.ident.to_string().to_pascal_case();
     let shader_defs = shader_def_idents

crates/bevy_diagnostic/Cargo.toml

@@ -20,6 +20,3 @@ bevy_core = { path = "../bevy_core", version = "0.5.0" }
 bevy_ecs = { path = "../bevy_ecs", version = "0.5.0" }
 bevy_log = { path = "../bevy_log", version = "0.5.0" }
 bevy_utils = { path = "../bevy_utils", version = "0.5.0" }
-
-# other
-parking_lot = "0.11.0"

crates/bevy_ecs/Cargo.toml

@@ -24,15 +24,16 @@ bevy_utils = { path = "../bevy_utils", version = "0.5.0" }
 bevy_ecs_macros = { path = "macros", version = "0.5.0" }
 
 async-channel = "1.4"
-bitflags = "1.2"
 fixedbitset = "0.4"
 fxhash = "0.2"
 thiserror = "1.0"
 downcast-rs = "1.2"
-parking_lot = "0.11"
 rand = "0.8"
 serde = "1"
 
+[dev-dependencies]
+parking_lot = "0.11"
+
 [[example]]
 name = "events"
 path = "examples/events.rs"

crates/bevy_macro_utils/Cargo.toml

@@ -14,5 +14,4 @@ keywords = ["bevy"]
 
 [dependencies]
 cargo-manifest = "0.2.3"
-proc-macro2 = "1.0"
 syn = "1.0"

crates/bevy_pbr/Cargo.toml

@@ -17,13 +17,11 @@ keywords = ["bevy"]
 bevy_app = { path = "../bevy_app", version = "0.5.0" }
 bevy_asset = { path = "../bevy_asset", version = "0.5.0" }
 bevy_core = { path = "../bevy_core", version = "0.5.0" }
-bevy_derive = { path = "../bevy_derive", version = "0.5.0" }
 bevy_ecs = { path = "../bevy_ecs", version = "0.5.0" }
 bevy_math = { path = "../bevy_math", version = "0.5.0" }
 bevy_reflect = { path = "../bevy_reflect", version = "0.5.0", features = ["bevy"] }
 bevy_render = { path = "../bevy_render", version = "0.5.0" }
 bevy_transform = { path = "../bevy_transform", version = "0.5.0" }
-bevy_window = { path = "../bevy_window", version = "0.5.0" }
 
 # other
 # direct dependency required for derive macro

crates/bevy_render/Cargo.toml

@@ -31,7 +31,6 @@ image = { version = "0.23.12", default-features = false }
 # misc
 serde = { version = "1", features = ["derive"] }
 bitflags = "1.2.1"
-smallvec = { version = "1.6", features = ["union", "const_generics"] }
 once_cell = "1.4.1" # TODO: replace once_cell with std equivalent if/when this lands: https://github.com/rust-lang/rfcs/pull/2788
 downcast-rs = "1.2.0"
 thiserror = "1.0"

crates/bevy_scene/Cargo.toml

@@ -27,4 +27,3 @@ ron = "0.6.2"
 uuid = { version = "0.8", features = ["v4", "serde"] }
 anyhow = "1.0"
 thiserror = "1.0"
-parking_lot = "0.11.0"

crates/bevy_tasks/Cargo.toml

@@ -20,7 +20,10 @@ futures-lite = "1.4.0"
 event-listener = "2.4.0"
 async-executor = "1.3.0"
 async-channel = "1.4.2"
-instant = { version = "0.1", features = ["wasm-bindgen"] }
 num_cpus = "1"
+
 [target.'cfg(target_arch = "wasm32")'.dependencies]
 wasm-bindgen-futures = "0.4"
+
+[dev-dependencies]
+instant = { version = "0.1", features = ["wasm-bindgen"] }

crates/bevy_winit/Cargo.toml

@@ -21,7 +21,6 @@ x11 = ["winit/x11"]
 bevy_app = { path = "../bevy_app", version = "0.5.0" }
 bevy_ecs = { path = "../bevy_ecs", version = "0.5.0" }
 bevy_input = { path = "../bevy_input", version = "0.5.0" }
-bevy_log = { path = "../bevy_log", version = "0.5.0" }
 bevy_math = { path = "../bevy_math", version = "0.5.0" }
 bevy_window = { path = "../bevy_window", version = "0.5.0" }
 bevy_utils = { path = "../bevy_utils", version = "0.5.0" }