How to use grain wasm files in Deno

[Mishieck]

Hi,

I would like to write code using Grain, convert the code to WebAssembly, and finally use the WebAssembly code in Deno.

Let's say I have a Grain module is-even.gr with the following code:

let isEven = (value) => value % 2 == 0;

export isEven;

I would like to be able to transpile the code to a wasm file that is compatible with Deno. I would like to use the wasm code as demonstrated in the Deno script below.

const wasmCode = await Deno.readFile('is-even.gr.wasm');
const wasmModule = new WebAssembly.Module(wasmCode);
const wasmInstance = new WebAssembly.Instance(wasmModule, {});
const isEven = wasmInstance.exports.isEven as CallableFunction;
console.log(isEven(2));
console.log(isEven(1));

I've tried to use the wasm file generated using grain is-even.gr, but it doesn't work. I'm getting the following error:

error: Uncaught (in promise) TypeError: WebAssembly.Instance(): Import #0 module="GRAIN$MODULE$runtime/gc" error: module is not an object or function
const wasmInstance = new WebAssembly.Instance(wasmModule, {});

[phated]

I'll transfer this to a discussion.

[Mishieck]

Ok. Thanks.

[spotandjake]

https://deno.land/[email protected]/getting_started/webassembly there is the docs with using Wasm with Deno, you would basically just take your <compiledFileName>.gr.wasm and use the docs there to run the contents inside. to get the compiled file you would rungrain compiler <compiledFileName>.gr --release. I don't use demo specifically so I can't help a ton more than that but hopefully that helps you a little.