wasm-bindgen is a rust crate for facilitating high-level interactions between WebAssembly (Wasm) modules and JavaScript.
Questions tagged [wasm-bindgen]
254 questions
5
votes
1 answer
Invalid or unexpected token 'import' - jest/babel/webpack
I have a rust library I am trying to cross-compile and pack into a npm script. I have been following the process of using the wasm pack. The process builds the es6 js, I wrote some crude tests, then decided to try to use jest as a test runner as I…
nshcore
- 73
- 1
- 6
5
votes
0 answers
How to get rid of lifetime in wrapper struct for wasm_bindgen
currently I have some code similar to the following:
// Lifetime of child is enforced to be valid as far as Parent is valid
struct Child<'a> {
some_data : i32,
phantom_lifetime: PhantomData<&'a Parent>
}
struct Parent…
milck
- 592
- 3
- 12
5
votes
1 answer
Rust wasm_bindgen object turns null in JS side when the object is added to a vector
I have two structs exported to Javascript. I can create instances and use them in JavaScript without any error but when I push the instances into a vector in Rust side, I have an error "Uncaught Error: null pointer passed to rust"
Since ownership is…
None
- 330
- 2
- 16
5
votes
0 answers
How do I access a wasm modules memory when its loaded by webpack
I'm trying to follow
How to return a string (or similar) from Rust in WebAssembly?
Which allows accessing String data inside a wasm module.
I have used wasm-pack build to build a RUST module and I can access the methods exported but not the memory…
teknopaul
- 6,505
- 2
- 30
- 24
5
votes
0 answers
How can I load WASM modules in webview with Rust?
I'm trying to host a React app in webview which uses a compiled Rust -> WebAssembly module.
I get this error:
Unhandled promise rejection: TypeError: URL is not valid or contains user credentials.
The WASM module gets called in one of the…
Andrew Zah
- 53
- 1
- 3
5
votes
2 answers
How to return a Rust closure to JavaScript via WebAssembly?
The comments on closure.rs are pretty great, however I can't make it work for returning a closure from a WebAssembly library.
I have a function like this:
#[wasm_bindgen]
pub fn start_game(
start_time: f64,
screen_width: f32,
…
davidkomer
- 3,020
- 2
- 23
- 58
5
votes
2 answers
How can I work around not being able to export functions with lifetimes when using wasm-bindgen?
I'm trying to write a simple game that runs in the browser, and I'm having a hard time modeling a game loop given the combination of restrictions imposed by the browser, rust, and wasm-bindgen.
A typical game loop in the browser follows this…
w.brian
- 16,296
- 14
- 69
- 118
4
votes
1 answer
Rust Wasm constructor - Uncaught TypeError: Cannot read properties of undefined
I'm following the simple example as in here to export a rust struct to a React TypeScript application :
#[wasm_bindgen]
pub struct Foo {
contents: u32,
}
#[wasm_bindgen]
impl Foo {
#[wasm_bindgen(constructor)]
pub fn new() -> Foo {
…
mastro
- 619
- 1
- 8
- 17
4
votes
3 answers
Load wasm in VSCode Web Extension
I'm trying to load a wasm module with a VSCode web extension.
I started from the "lsp-web-extension-sample".
Within the server directory, I created a simple rust lib with wasm-bindgen, it successfully compiles with wasm-pack. When I call the init…
Cohars
- 3,822
- 1
- 29
- 50
4
votes
0 answers
Unittests in Rust with WebAssembly
I'm writing a frontend in WASM by using the seed framework.
I want to test one of my modules with unittests, but I can't make them to test WASM code. Here's my test suite:
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn…
Djent
- 2,877
- 10
- 41
- 66
4
votes
0 answers
How to exec js code on rust with wasm-bindgen correctly
I'm working with rust, WASM, and yew as frontend framework. I'm building a wrapper around materialize-css, to use it on yew as dependency of reusable components.
To use some materialize-css components it's necesary initialize it. For example, to use…
al3x
- 589
- 1
- 4
- 16
4
votes
3 answers
How do I make an HTTP request within a wasm_bindgen function in Rust?
I am developing a NODE JS package using Rust and wasm-pack to compile, and I need to make HTTP requests in my code. I tried to use reqwest library, so everything works fine in the test but I get an error in packing.
#![allow(non_snake_case)]
use…
Fomalhaut
- 8,590
- 8
- 51
- 95
4
votes
0 answers
The trait `IntoWasmAbi` is not implemented for `HashMap
Trying to compile following rust code to wasm to make it compatible running with existing js. Trying to return hashmaped value from function.
lib.rs
use wasm_bindgen::prelude::*;
use std::collections::HashMap;
#[wasm_bindgen]
pub fn…
Anil Arya
- 3,100
- 7
- 43
- 69
4
votes
1 answer
How to call Rust from JS and back?
I'm trying to adapt the game of life tutorial to call user-defined JS (instead of alert) from Rust:
index.js:
import * as wasm from "testing-wasm";
export const jsfunc = () => {
console.log("jsfunc called");
};
// Call Rust from JS. This…
User
- 31,811
- 40
- 131
- 232
4
votes
1 answer
no prebuilt wasm-opt binaries
I'm trying to build some webassembly rust applications on my raspberry pi (3b). Everything is going well, although I'm getting an error when running wasm-pack
~/rust/wasm-game-of-life $ wasm-pack build
[INFO]: Checking for the Wasm target...
[INFO]:…
JHBonarius
- 10,824
- 3
- 22
- 41