feat(wasm): add setup_allocator macro for optimize the binary a bit

wasm/README.md

@@ -7,10 +7,22 @@
 wasm = { git = "https://github.com/LiterateInk/Utilities" }
 wasm-bindgen = "0.2" # required for the `wasm_bindgen::prelude::wasm_bindgen` macro
 js-sys = "0.3" # required for the `js_sys::Function` type
+wee_alloc = "0.4" # required when using `setup_allocator!()`
 ```
 
 ## Usage
 
+### `setup_allocator`
+
+```rust
+#[cfg(target_arch = "wasm32")]
+wasm::setup_allocator!();
+```
+
+Will use the `wee_alloc` crate to set up a global allocator for the `wasm32` target.
+
+### `api_method`
+
 ```rust
 #[cfg_attr(target_arch = "wasm32", wasm::api_method)]
 pub async fn fetch_github(something: String) -> String {

wasm/src/lib.rs

@@ -29,3 +29,15 @@ pub fn api_method(_args: TokenStream, input: TokenStream) -> TokenStream {
 
   TokenStream::from(output)
 }
+
+#[proc_macro]
+pub fn setup_allocator(_input: TokenStream) -> TokenStream {
+  let expanded = quote! {
+    extern crate wee_alloc;
+
+    #[global_allocator]
+    static ALLOC: wee_alloc::WeeAlloc = wee_alloc::WeeAlloc::INIT;
+  };
+
+  TokenStream::from(expanded)
+}