[Web] wasmPaths type changed - no available backend found

[romankoho]

Describe the issue

Until version "onnxruntime-web": "1.17.1" I have set the links to my wasm files like this:

ort.env.wasm.wasmPaths = {
  'ort-wasm.wasm': '/sam/ort-wasm.wasm',
  'ort-wasm-simd.wasm': '/sam/ort-wasm-simd.wasm',
  'ort-wasm-simd-threaded.wasm': '/sam/ort-wasm-simd-threaded.wasm',
  'ort-wasm-threaded.wasm': '/sam/ort-wasm-threaded.wasm'
}

// create inferenceSession and set model
  useEffect(() => {
    // Initialize the ONNX model
    const initModel = async () => {
      try {
        const URL: string = `${window.location.origin}${globalConfig.get().ONNX_MODEL_PATH}`
        const model = await InferenceSession.create(URL)
        setModel(model)
      } catch (e) {
        console.log(e)
      }
    }

    if (!model) {
      initModel()
    }
  }, [])

I have updated to version "onnxruntime-web 1.20.1 and apparently the type of wasmPaths changed.

Also no backend is found anymore. This error is logged in the console when mounting the component where I have the above mentioned code.

The wasm files are saved in public/sam

I'd be happy for some hints on how to change the setup. Thanks!

To reproduce

Setup React project with vite

Setup:

• React 18.2.0
• Typescript: 4.9.5
• Vite 4.5.5
• "onnxruntime-web": "1.17.1",
• copy wasm files to /public
• set ort.env.wasm.wasmPaths
• create model

Urgency

I can sty on 1.17.1 for now but would still like to know what I need to change

ONNX Runtime Installation

Released Package

ONNX Runtime Version or Commit ID

1.17.1

Execution Provider

'wasm'/'cpu' (WebAssembly CPU)

[fs-eire]

Please check if the following fix works for you:

• use latest dev version of onnxruntime-web (currently it's 1.21.0-dev.20250129-80bc1d25f0)
• apply the workaround as suggested in new URL(foo, import.meta.url) doesn't work when dependency was optimized vitejs/vite#8427. This is a known issue affecting all Vite app depending on WebAssembly based packages.

If everything went smoothly, you should not need to modify ort.env.wasm.wasmPaths or manually copy any .wasm files.

[romankoho]

Thanks for the answer! Unfortunately, I can't really confirm your suggestion.

I now get an error that the type Tensor cannot be imported

At least my IDE finds the exported type in the library.

[fs-eire]

Do you mind sharing the full code? I can take a look if I can reproduce the issue.

[romankoho]

@fs-eire your solution works!
What was missing to fix my last issue was to update Vite to "vite": "^6.0.5". I am now on "onnxruntime-web": "^1.20.1". No need to copy any wasm files to the public folder or set the wasmPaths.

thanks for your help and time!