Bug: WASM library is crashing in Node.js

[timokoessler]

Describe the bug The package wasm-themis can not be used with Node.js because it tries to call fetch() on a file path.

To Reproduce Steps to reproduce the behavior:

1. Install Node.js v22
2. Run npm i wasm-themis
3. Minimal example script

const themis = require('wasm-themis');

async function test() {
    await themis.initialized;
    console.log('Themis initialized');
    const keyPair = new themis.KeyPair();
    console.log('Generated key pair:', keyPair);
}

test();

Exception:

TypeError: fetch failed
    at node:internal/deps/undici/undici:13392:13 {
  [cause]: Error: unknown scheme
      at makeNetworkError (node:internal/deps/undici/undici:9166:35)
      at schemeFetch (node:internal/deps/undici/undici:10568:34)
      at node:internal/deps/undici/undici:10410:26
      at mainFetch (node:internal/deps/undici/undici:10429:11)
      at fetching (node:internal/deps/undici/undici:10377:7)
      at fetch (node:internal/deps/undici/undici:10246:20)
      at fetch (node:internal/deps/undici/undici:13390:10)
      at fetch (node:internal/bootstrap/web/exposed-window-or-worker:72:12)
      at instantiateAsync (C:\Users\info\Documents\Git\hash-chat\backend\node_modules\wasm-themis\dist\libthemis.js:9:19056)
      at createWasm (C:\Users\info\Documents\Git\hash-chat\backend\node_modules\wasm-themis\dist\libthemis.js:9:19666)
}

Expected behavior A clear and concise description of what you expected to happen.

Environment (please complete the following information):

• OS: Windows 11
• Hardware: 64-bit
• Themis version: [email protected]
• Installation way: via package manager

Additional context A temporary workaround I found is modifying the function instantiateAsync in the file libthemis.js by adding return instantiateArrayBuffer(receiveInstantiationResult); to the begging of the function.

[vixentael]

Thank you for reporting! That's definitely not expected, we will test on Linux/macOS to see if we could reproduce the issue, or maybe it will required a windows-only fix.