Solve: How to Use FinalizationRegistry in Cloudflare Workers Without Missteps
Solve: How to Use FinalizationRegistry in Cloudflare Workers Without Missteps Understanding the Challenge: Manual Memory in Wasm In Cloudflare Workers, combining JavaScript with WebAssembly (Wasm) brings high-performance possibilities—but also complicates memory management. JavaScript employs automatic garbage collection, freeing developers from manual memory concerns. Wasm, however, uses a linear memory buffer that must be explicitly managed—allocating and deallocating memory manually to avoid leaks. For example, consider this Rust-based Wasm snippet compiled for Workers: rust #[no_mangle] pub extern "C" fn make_buffer(out_len: *mut usize) -> *mut u8 { let mut data = b"Hello from Rust".to_vec(); let ptr = data.as_mut_ptr(); let len = data.len(); unsafe { *out_len = len }; std::mem::forget(data); // JS must free this later ptr } #[no_mangle] pub unsafe extern "C" fn free_buffer(ptr: *mut u8, len: usize) { let _ = Vec::from_r...
