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Questions tagged [wasm-bindgen]

wasm-bindgen is a rust crate for facilitating high-level interactions between WebAssembly (Wasm) modules and JavaScript.

254 questions
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Why is passing DOM objects as `exnternref`s *slower* than passing through the JS value table?

I made a benchmark to measure how fast it is to call DOM APIs by passing DOM objects as exnternrefs to a Wasm function. This is the function to measure (written in Rust and compiled by rustc 1.55.0): #[wasm_bindgen] pub fn append_and_remove(elem:…
YAMAMOTO Yuji
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Rust wasm-bindgen struct with string

I'm trying to export the following struct: #[wasm_bindgen] #[derive(Eq, PartialEq, Debug, Clone)] pub enum TokenType { KeywordLiteral, NumberLiteral, Operator, Separator, StringLiteral, } #[wasm_bindgen] #[derive(Eq, PartialEq,…
Elias
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Why do the values of Rust WASM pointer and JS pointer differ?

Let's say I have the following definitions in the Rust code: #[wasm_bindgen] pub struct RustType { foo: usize } #[wasm_bindgen] impl RustType { #[wasm_bindgen(constructor)] pub fn new() -> Self { Self { foo: 100 } …
OlegTheCat
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Can C++ and Rust programs compiled to wasm interoperate somehow?

Let's say I have one program written in Rust and another in C++. Given that they both are compiled to Wasm, can I somehow call a function in one program from the other?
Nurbol Alpysbayev
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Using a Yew Callback as a wasm_bindgen Closure

This question is written for Yew v0.19 Asynchronous foreign JavaScript functions can be used in Rust through Closures, as the function to pass-in: #[wasm_bindgen] extern "C" { fn setInterval(closure: &Closure, time: u32) ->…
Athan Clark
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How to import JavaScript functions with wasm-bindgen with --target no-modules?

I am trying to work out how to call a JavaScript function using Rust and wasm-bindgen. Due to lack of browser support, I cannot use wasm-bindgen with ES6 modules together with a Web Worker. As far as I can tell, declaring that a JavaScript function…
Skeletonxf
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Why does js_sys Promise::new require FnMut?

js_sys exposes JavaScript Promise via a function pub fn new(cb: &mut dyn FnMut(Function, Function)) -> Promise;. Per my reading of the MDN documentation, there's nothing suggesting that the executor function will be called more than once, yet js_sys…
Huckle
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Only 1/4th of max memory available when rust wasm compiled with +atomics flag webassembly

So, I've been running out of memory with wasm/rust with +atomic flag and wanted to check how much memory is practically available. Here is my crude minimal working example that logs the memory of a vector before it panics: index.js import init from…
ste_kwr
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How to call an async JavaScript Import Function from WebAssembly (Rust) in a node.js environment?

Let's consider an example import object that looks like this: const importObject = { exampleAsyncImportFunction: async () => fs.readFile("./someExampleFile.txt", "utf-8") // returns Promise }; I want to use it in my rust-written…
Konrad Koschel
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Rust - Wasm - Iterating over input file

I'm trying to get access to an Iterator over the contents of a file uploaded via an input field. I can pass the JS file into Wasm just fine via web-sys, but I cannot for the life of me figure out how to access anything other then length and name of…
Erik Schulze
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How can I call a JavaScript function that is a module with wasm-bindgen?

I'm trying to use the Web3 JavaScript library from Rust and I'm stuck. The standard usage of the library starts with: // In Node.js use: const Web3 = require('web3'); let web3 = new Web3(Web3.givenProvider || "ws://localhost:8545"); The module…
Echo Nolan
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How can a Vec be returned as a typed array with wasm-bindgen?

I have a Vec I would like to return and convert to a typed array with wasm-bindgen, ie, to turn a Vec into a Uint32Array. From my research it appears that wasm-bindgen cannot handle automatically converting these by itself right now (like it…
curiousdannii
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Why are string arguments blank when calling an async Rust function compiled to Wasm from JavaScript?

I'm using wasm_bindgen built with wasm-pack. I have a Rust function I expose to JS: #[wasm_bindgen] pub async fn validate_registration_token(backend_api_domain: String, token: String) -> Result { …
BenjaminC
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How to actually get the text of the response body in WASM-Bindgen and Rust

Maybe this is a simple question, but I have yet to find the answer anywhere. I've searched the documentation, but the single example I have found on the entire internet for web-sys fetch still doesn't address this (the official docs, no less). How…
gajbooks
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How to use Vec as return type and make it readable in Javascript with wasm_bindgen

I want to compile the following code. use wasm_bindgen::prelude::*; #[wasm_bindgen] pub struct Dummy {} #[wasm_bindgen] pub fn test() -> Vec { vec![] } However, the compiler doesn't allow me to do that. error[E0277]: the trait bound…
buckle2000
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