wasm-bindgen is a rust crate for facilitating high-level interactions between WebAssembly (Wasm) modules and JavaScript.
Questions tagged [wasm-bindgen]
254 questions
3
votes
1 answer
How to use exported struct in JS file?
I have the following definitions in the Rust code:
#[wasm_bindgen]
pub struct Point {
x: i32,
y: i32,
}
#[wasm_bindgen]
impl Point {
#[wasm_bindgen(constructor)]
pub fn new(x: i32, y: i32) -> Point {
Point { x, y }
…
akshay karande
- 138
- 7
3
votes
2 answers
Rust wasm in next js
I am trying to use a rust-generated wasm module inside of my NextJs project.
I am importing the wasm in the following way:
import init, { tokenize } from "@/wasm/lazyjson";
const Test = dynamic({
loader: async () => {
await init();
…
Elias
- 3,592
- 2
- 19
- 42
3
votes
0 answers
Using tagged unions from JavaScript with wasm-bindgen
I have a JavaScript object type where the kind field determines what other fields are present. Examples:
{ kind: 0, name: "foo" }
{ kind: 1, name: "foo", value: 69 }
{ kind: 2 }
I put it into an extern block to use it in…
Dull Bananas
- 892
- 7
- 29
3
votes
1 answer
How can I convert JsString into &str in Rust WASM?
How can I convert an instance of type js_sys::JsString into &str within Rust WebAssembly code?
Background: I'd like to convert the code found in this SO answer into Rust. I struggle to pass the output of js_sys::encode_uri_component as the value…
blerontin
- 2,892
- 5
- 34
- 60
3
votes
1 answer
`*arg0` does not live long enough - wasm_bindgen
When running the following code:
Cargo.toml
[lib]
crate-type = ["cdylib"]
[dependencies]
serde = { version = "1.0", features = ["derive"] }
wasm-bindgen = {version = "0.2.67", features = ["serde-serialize"] }
wasm-bindgen-futures =…
Eidolon
- 309
- 3
- 12
3
votes
1 answer
How to Pass a String from Js to Wasm generated through Rust using Wasm-Bindgen Web_sys Wasm-pack
the code is basic i am calling a function from js with a string input which is declared in the lib.rs
but the string is not passing onto the function in wasm i am receiving an empty string and the reverse is also not working i am not able to pass a…
Alexei Kitaev
- 159
- 1
- 4
3
votes
1 answer
Rust Petgraph WASM Project, trying to use struct with Graph property, but requires 2 parameters
I am very new to Rust, so this might be a very rookie question.
I am trying to create a web app with rust -> wasm. Tried to follow the tutorial https://rustwasm.github.io/docs/book/introduction.html and tried to use the crate package "petgraph"
I…
bbofrk
- 33
- 3
3
votes
2 answers
How to access JS object properties in Wasm (Rust)?
I'm using wasm bindgen and I have following function :
#[wasm_bindgen]
pub fn obj(o: &JsValue){
console::log_1(o);
}
and in js I call this function obj({name: "john"});
and it works fine, but when i try to console::log_1(o.name);
it gives error…
filiplitwora
- 43
- 5
3
votes
2 answers
How can I link a Rust Wasm application with libpq via wasm-pack?
I'm trying to create a NodeJS application with a Wasm database layer. I use Rust, Diesel as a database driver and wasm-pack as a WebAssembly compiler.
When I try to build my service with wasm-pack, it fails trying to link the libpq library. The…
Lodin
- 2,028
- 2
- 18
- 29
3
votes
1 answer
Implementation of Send is missing when calling FutureExt::boxed()
I'm experimenting with futures with WASM, using wasm-bindgen-futures and the rust-webpack-template; the full working code and problem code is available.
My experiment is to call an async fn run(), wrapped by a fn run_js() -> js_sys::Promise, from…
Silly Freak
- 4,061
- 1
- 36
- 58
3
votes
0 answers
How to handle Rust's errors from Result as a return value instead of throwing an exception in JavaScript?
I'd like to write JavaScript like:
var [greeting, err] = wasm.hello("world");
It appears that if I use the standard Result type, then I need to use a try/catch:
try {
greeting = wasm.hello()
}
catch(error) {
console.error(error);
}
Rust code…
Ultrasaurus
- 3,031
- 2
- 33
- 52
3
votes
2 answers
Rust WebAssembly Custom Elements Memory Deallocation Error
My first Rust-produced WASM is producing the following error, I have no idea how to go about it debugging.
wasm-000650c2-23:340 Uncaught RuntimeError: memory access out of bounds
at dlmalloc::dlmalloc::Dlmalloc::free::h36961b6fbcc40c05…
Lee Goddard
- 10,680
- 4
- 46
- 63
3
votes
3 answers
How to dump wasm?
I found out that you can view wasm modules in developer mode in chrome, and I also found a chromium flag here, however I want to use a different browser to dump the wasm file.
How do I do that?
John v B
- 41
- 1
- 3
2
votes
1 answer
use blockon in rust wasm
i want to use block_on in rust when compiling to wasm.
The problem is i am using egui and want to compile it to web. Its function are sync and i need to block async functions. I tried with async_futures, but it seems to start the future, but not…
justauser
- 23
- 3
2
votes
1 answer
How to get a value out of a wasm_bindgen_futures::spawn_local
I know that wasm doesn't have blocking so how would I do the equivalent. Or is there a different tool to use? I'm new to this so it could also be that my approach is completely off. I'm using wasm-pack with a web target to compile.
fn…
Diomedes
- 31
- 1