Compile serde_derive to wasm

wa-serde-derive/.gitignore

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+*.wasm

wa-serde-derive/Cargo.toml

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+[package]
+name = "wa-serde-derive"
+version = "0.1.137"
+authors = ["David Tolnay <dtolnay@gmail.com>"]
+license = "MIT OR Apache-2.0"
+description = "serde_derive compiled to wasm"
+repository = "https://github.com/dtolnay/watt"
+include = ["src"]
+
+[lib]
+proc-macro = true
+
+[dependencies]
+watt = "0.4"
+
+[workspace]

wa-serde-derive/src/lib.rs

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+extern crate proc_macro;
+extern crate watt;
+
+use proc_macro::TokenStream;
+use watt::WasmMacro;
+
+static MACRO: WasmMacro = WasmMacro::new(WASM);
+static WASM: &[u8] = include_bytes!("serde_derive.wasm");
+
+#[proc_macro_derive(Serialize, attributes(serde))]
+pub fn derive_serialize(input: TokenStream) -> TokenStream {
+    MACRO.proc_macro_derive("derive_serialize", input)
+}
+
+#[proc_macro_derive(Deserialize, attributes(serde))]
+pub fn derive_deserialize(input: TokenStream) -> TokenStream {
+    MACRO.proc_macro_derive("derive_deserialize", input)
+}