Crate wasm_split_helpers 

Annotate functions as appropriate split points for lazy-loaded code in WebAssembly (WASM).

use wasm_split_helpers::wasm_split;

#[wasm_split(rot13_cipher)]
fn rot13(text: &str) -> String {
    text.chars()
        .map(|c| match c {
            'A'..='M' | 'a'..='m' => ((c as u8) + 13) as char,
            'N'..='Z' | 'n'..='z' => ((c as u8) - 13) as char,
            _ => c,
        })
        .collect()
}

async fn check_passphrase(cipher: &str) {
    assert_eq!(rot13(cipher).await, "furrfu", "wrong passphrase!");
}

Attribute Macros

wasm_split

Indicate a function as a split point.