Add wasm64-unknown-unknown support for wasm_js backend

Author: newpavlov

Cargo.toml

@@ -86,11 +86,11 @@ wasip2 = { version = "1", default-features = false }
 wasip3 = ">=0.3, <=0.4"
 
 # wasm_js
-[target.'cfg(all(target_arch = "wasm32", any(target_os = "unknown", target_os = "none")))'.dependencies]
+[target.'cfg(all(any(target_arch = "wasm32", target_arch = "wasm64"), any(target_os = "unknown", target_os = "none")))'.dependencies]
 wasm-bindgen = { version = "0.2.98", default-features = false, optional = true }
-[target.'cfg(all(target_arch = "wasm32", any(target_os = "unknown", target_os = "none"), target_feature = "atomics"))'.dependencies]
+[target.'cfg(all(any(target_arch = "wasm32", target_arch = "wasm64"), any(target_os = "unknown", target_os = "none"), target_feature = "atomics"))'.dependencies]
 js-sys = { version = "0.3.77", default-features = false, optional = true }
-[target.'cfg(all(target_arch = "wasm32", any(target_os = "unknown", target_os = "none")))'.dev-dependencies]
+[target.'cfg(all(any(target_arch = "wasm32", target_arch = "wasm64"), any(target_os = "unknown", target_os = "none")))'.dev-dependencies]
 wasm-bindgen-test = "0.3"
 
 [lints.rust.unexpected_cfgs]

README.md

@@ -67,16 +67,16 @@ Pull Requests that add support for new targets to `getrandom` are always welcome
 
 ### WebAssembly support
 
-This crate fully supports the [WASI] and [Emscripten] targets. However,
-the `wasm32-unknown-unknown` target (i.e. the target used by `wasm-pack`)
-is not automatically supported since, from the target name alone, we cannot deduce
+This crate fully supports the [WASI] and [Emscripten] targets. However, the `wasm32-unknown-unknown`
+and `wasm64-unknown-unknown` targets (i.e. the target used by `wasm-pack`)
+are not automatically supported since, from the target name alone, we cannot deduce
 which JavaScript interface should be used (or if JavaScript is available at all).
 
-We do not include support for this target in the default configuration because our JS backend
+We do not include support for these targets in the default configuration because our JS backend
 (supporting web browsers, web workers and Node.js v19 or later) requires [`wasm-bindgen`],
 **bloating `Cargo.lock`** and **potentially breaking builds** on non-web WASM platforms.
 
-To enable `getrandom`'s functionality on `wasm32-unknown-unknown` using
+To enable `getrandom`'s functionality on `wasm32/64-unknown-unknown` using
 [`Crypto.getRandomValues`] via [`wasm-bindgen`], enable the `wasm_js` crate feature.
 
 WARNING: We strongly recommend against enabling this feature in libraries (except for tests)

src/backends.rs

@@ -167,15 +167,18 @@ cfg_if! {
     } else if #[cfg(all(target_arch = "x86_64", target_env = "sgx"))] {
         mod rdrand;
         pub use rdrand::*;
-    } else if #[cfg(all(target_arch = "wasm32", any(target_os = "unknown", target_os = "none")))] {
+    } else if #[cfg(all(
+        any(target_arch = "wasm32", target_arch = "wasm64"),
+        any(target_os = "unknown", target_os = "none"),
+    ))] {
         cfg_if! {
             if #[cfg(feature = "wasm_js")] {
                 mod wasm_js;
                 pub use wasm_js::*;
             } else {
                 compile_error!(concat!(
-                    "The wasm32-unknown-unknown targets are not supported by default; \
-                    you may need to enable the \"wasm_js\" crate feature. \
+                    "The wasm32-unknown-unknown and wasm64-unknown-unknown targets are not supported
+                    by default; you may need to enable the \"wasm_js\" crate feature. \
                     For more information see: \
                     https://docs.rs/getrandom/", env!("CARGO_PKG_VERSION"), "/#webassembly-support"
                 ));

src/backends/wasm_js.rs

@@ -4,10 +4,13 @@ use core::mem::MaybeUninit;
 
 pub use crate::util::{inner_u32, inner_u64};
 
-#[cfg(not(all(target_arch = "wasm32", any(target_os = "unknown", target_os = "none"))))]
+#[cfg(not(all(
+    any(target_arch = "wasm32", target_arch = "wasm64"),
+    any(target_os = "unknown", target_os = "none"),
+)))]
 compile_error!("`wasm_js` backend can be enabled only for OS-less WASM targets!");
 
-use wasm_bindgen::{prelude::wasm_bindgen, JsValue};
+use wasm_bindgen::{JsValue, prelude::wasm_bindgen};
 
 // Maximum buffer size allowed in `Crypto.getRandomValuesSize` is 65536 bytes.
 // See https://developer.mozilla.org/en-US/docs/Web/API/Crypto/getRandomValues