How does piscina load ts files?

[Wu1905]

export function registerWorker(threadName: number, filePath: string, isTypescript: boolean = true, maxThreads: number = 4) {
  if (filePath.startsWith("@")) {
    // atPath is project root path
    filePath = path.join(atPath, filePath.slice(2) + (isTypescript ? '.ts' : '.js'));
  }
  const pool = new Piscina({
    filename: filePath,
    maxThreads,
   // !!: Hear, it is not work.But it is work in worker_threads
    ...(isTypescript ? { execArgv: ['-r', 'ts-node/register'] } : {}),
  })
  return pool;
}

[Wu1905]

run this function, i got this:

TypeError [ERR_UNKNOWN_FILE_EXTENSION]: Unknown file extension ".ts" for ....
    at new NodeError (node:internal/errors:405:5)
    at Object.getFileProtocolModuleFormat [as file:] (node:internal/modules/esm/get_format:136:11)
    at defaultGetFormat (node:internal/modules/esm/get_format:182:36)
    at defaultLoad (node:internal/modules/esm/load:101:20)
    at ModuleLoader.load (node:internal/modules/esm/loader:417:13)
    at ModuleLoader.moduleProvider (node:internal/modules/esm/loader:288:22)
    at new ModuleJob (node:internal/modules/esm/module_job:63:26)
    at ModuleLoader.#createModuleJob (node:internal/modules/esm/loader:312:17)
    at ModuleLoader.getJobFromResolveResult (node:internal/modules/esm/loader:265:34)
    at ModuleLoader.getModuleJob (node:internal/modules/esm/loader:251:17) {
  code: 'ERR_UNKNOWN_FILE_EXTENSION'
}

[metcoder95]

We do not run any pre-parser or loader when handling TS files (we sort to only JS files).

It would be interesting to explore the handling of TS files, but currently is not supported

[zdila]

Just use tsc to compile all your *.ts files to *.js and then use .js extension in filename. For me it works.

[JPZV]

@zdila while that is the desired (and kind of only) way on production, it's not helpful while developing if you run your code through an IDE like VSCode and/or frameworks