Failed to run ffish.js and examples in node.js

[xianminx]

I want to use a js (with wasm) version of this lib for a web xiangqi project and find two versions of bindings:

1. port of Fairy-Stockfish to WebAssembly fairy-stockfish.wasm
2. The javascript binding ffish.js https://github.com/fairy-stockfish/Fairy-Stockfish/tree/master/tests/js

I am new to make wasm work in the browser. It seems the two are of similar functions, and I am a bit confusing which one to choose. I tried the both version, neither one work in the way I expect.

When I try ffish.js, the downloaded npm packages is as the following:

↑7 node_modules/ffish git:(master) ▶ tree
.
├── README.md
├── docker-compose.yml
├── ffish.d.ts
├── ffish.js
├── ffish.wasm
├── index.js

The npm package directory provides index.js file which is a express server file, and when I run node index.js
it shows the error that it cannot parse url for file ffish.wasm which indeed exist.

I Googled a bit and it means node cannot use fetch to access a local file system, even with file:// prefix.
So when the wasm file is served in the browser, this should work fine. I am curious if this node server file index.js (and test.js) works and if yes, how does it work as expected. What should I have to change or update to make it work too?
Thank you.

Ξ node_modules/ffish git:(master) ▶ node index.js 
Test server of ffish.js listening on port 8000.
http://127.0.0.1:8000/
TypeError: Failed to parse URL from /Users/xxx/dev/workspace/ff/fairy-stockfish-nnue-wasm-demo/node_modules/.pnpm/ffish@0.7.7/node_modules/ffish/ffish.wasm
TypeError: Failed to parse URL from /Users/xxx/dev/workspace/ff/fairy-stockfish-nnue-wasm-demo/node_modules/.pnpm/ffish@0.7.7/node_modules/ffish/ffish.wasm
/Users/xxx/dev/workspace/ff/fairy-stockfish-nnue-wasm-demo/node_modules/.pnpm/ffish@0.7.7/node_modules/ffish/ffish.js:1

.....
RuntimeError: abort(TypeError: Failed to parse URL from /Users/xxx/dev/workspace/ff/fairy-stockfish-nnue-wasm-demo/node_modules/.pnpm/ffish@0.7.7/node_modules/ffish/ffish.wasm). Build with -s ASSERTIONS=1 for more info.
    at process.abort (ffish.js:1:11719)
    at process.emit (node:events:520:28)
    at process.emit (node:events:532:35)
    at emitUnhandledRejection (node:internal/process/promises:250:13)
    at throwUnhandledRejectionsMode (node:internal/process/promises:385:19)
    at processPromiseRejections (node:internal/process/promises:470:17)
    at process.processTicksAndRejections (node:internal/process/task_queues:96:32) {
  uncaught: true
}

Node.js v22.2.0

[erik60reis]

you need to use Node.js 16 to use this library

If you want to use it on node.js 18, here is what I did to work with:

1. modify the ffish.js file to replace "fetch" to "fs.readFile"
2. drag the ffish.js and ffish.wasm to the node.js root folder (as we modified it and node_modules is on gitignore)
3. use the ffish.js with require (const ffish = require('./ffish.js')
4. on your index.js, make a function to wait the ffish load

let interval = setInterval(() => {
    if (typeof ffish.loadVariantConfig == 'function') {
        ffish.loadVariantConfig(fs.readFileSync(rootpath + "/variants.ini"));
        clearInterval(interval);
    }
}, 4000);

example:

https://github.com/erik60reis/chessnetwork/blob/main/games/ffish.js

https://github.com/erik60reis/chessnetwork/blob/main/games/ffish.wasm

about node.js 22, well, I'm still trying to make a way for ffish.js to work........