Repository: napi-rs/napi-rs
File: cli/src/api/templates/load-wasi-template.ts (TypeScript)

Code before:

const __rootDir = __nodePath.parse(process.cwd()).root

const __wasi = new __nodeWASI({
  version: 'preview1',
  env: process.env,
  preopens: {
    [__rootDir]: __rootDir,
  }
})

const __emnapiContext = __emnapiGetDefaultContext()

const __sharedMemory = new WebAssembly.Memory({
  initial: ${initialMemory},
  maximum: ${maximumMemory},
  shared: true,
})

let __wasmFilePath = __nodePath.join(__dirname, '${wasmFileName}.wasm')
const __wasmDebugFilePath = __nodePath.join(__dirname, '${wasmFileName}.debug.wasm')

if (__nodeFs.existsSync(__wasmDebugFilePath)) {
  __wasmFilePath = __wasmDebugFilePath
} else if (!__nodeFs.existsSync(__wasmFilePath)) {
  __wasmFilePath = __nodePath.resolve('node_modules/${packageName}-wasm32-wasi/${wasmFileName}.debug.wasm')
}

const { instance: __napiInstance, module: __wasiModule, napiModule: __napiModule } = __emnapiInstantiateNapiModuleSync(__nodeFs.readFileSync(__wasmFilePath), {
  context: __emnapiContext,
  asyncWorkPoolSize: (function() {
    const threadsSizeFromEnv = Number(process.env.NAPI_RS_ASYNC_WORK_POOL_SIZE ?? process.env.UV_THREADPOOL_SIZE)
    // NaN > 0 is false
    if (threadsSizeFromEnv > 0) {
      return threadsSizeFromEnv
    } else {
      return 4
    }
  })(),
  reuseWorker: true,
  wasi: __wasi,
  onCreateWorker() {
    const worker = new Worker(__nodePath.join(__dirname, 'wasi-worker.mjs'), {
      env: process.env,
    })
    worker.onmessage = ({ data }) => {
      __wasmCreateOnMessageForFsProxy(__nodeFs)(data)
    }

    // The main thread of Node.js waits for all the active handles before exiting.
    // But Rust threads are never waited without \`thread::join\`.

Review comment (bug):
The fallback path should look for the regular `.wasm` file instead of `.debug.wasm`. The logic checks for the debug version first (line 144), and if neither the debug nor regular version exist locally, it should fallback to the regular `.wasm` file in the package, not the debug version.

Suggested fix:
```typescript
__wasmFilePath = __nodePath.resolve('node_modules/${packageName}-wasm32-wasi/${wasmFileName}.wasm')
```
```suggestion
  __wasmFilePath = __nodePath.resolve('node_modules/${packageName}-wasm32-wasi/${wasmFileName}.wasm')
```

Code after:

const __rootDir = __nodePath.parse(process.cwd()).root

const __wasi = new __nodeWASI({
  version: 'preview1',
  env: process.env,
  preopens: {
    [__rootDir]: __rootDir,
  }
})

const __emnapiContext = __emnapiGetDefaultContext()

const __sharedMemory = new WebAssembly.Memory({
  initial: ${initialMemory},
  maximum: ${maximumMemory},
  shared: true,
})

let __wasmFilePath = __nodePath.join(__dirname, '${wasmFileName}.wasm')
const __wasmDebugFilePath = __nodePath.join(__dirname, '${wasmFileName}.debug.wasm')

if (__nodeFs.existsSync(__wasmDebugFilePath)) {
  __wasmFilePath = __wasmDebugFilePath
} else if (!__nodeFs.existsSync(__wasmFilePath)) {
  try {
    __wasmFilePath = require.resolve('${packageName}-wasm32-wasi/${wasmFileName}.wasm')
  } catch {
    throw new Error('Cannot find ${wasmFileName}.wasm file, and ${packageName}-wasm32-wasi package is not installed.')
  }
}

const { instance: __napiInstance, module: __wasiModule, napiModule: __napiModule } = __emnapiInstantiateNapiModuleSync(__nodeFs.readFileSync(__wasmFilePath), {
  context: __emnapiContext,
  asyncWorkPoolSize: (function() {
    const threadsSizeFromEnv = Number(process.env.NAPI_RS_ASYNC_WORK_POOL_SIZE ?? process.env.UV_THREADPOOL_SIZE)
    // NaN > 0 is false
    if (threadsSizeFromEnv > 0) {
      return threadsSizeFromEnv
    } else {
      return 4
    }
  })(),
  reuseWorker: true,
  wasi: __wasi,
  onCreateWorker() {
    const worker = new Worker(__nodePath.join(__dirname, 'wasi-worker.mjs'), {
      env: process.env,
    })
    worker.onmessage = ({ data }) => {
      __wasmCreateOnMessageForFsProxy(__nodeFs)(data)