Unknown file extension ".zx"

[lukakostic]

Script:

#!/usr/bin/env zx

console.log("Hi");

Ran with:
$ ./my-script.zx

Results in:

TypeError [ERR_UNKNOWN_FILE_EXTENSION]: Unknown file extension ".zx" for /data/bin/my-script.zx
    at Object.getFileProtocolModuleFormat [as file:] (node:internal/modules/esm/get_format:160:9)
    at defaultGetFormat (node:internal/modules/esm/get_format:203:36)
    at defaultLoad (node:internal/modules/esm/load:143:22)
    at async ModuleLoader.load (node:internal/modules/esm/loader:409:7)
    at async ModuleLoader.moduleProvider (node:internal/modules/esm/loader:291:45)
    at async link (node:internal/modules/esm/module_job:76:21) {
  code: 'ERR_UNKNOWN_FILE_EXTENSION'
}

Why does it care about file extensions on linux?
Why cant i end my script file with .zx ?
If im running with the hashbang zx , obviously its a valid zx script (javascript) which im trying to run, so why check extension?
Its not like i can run typescript too so it needs to know js vs ts ?

[antongolub]

nodejs/node#23868

// loader.mjs

import path from 'node:path'
const exts = new Set(['.zx'])

export async function resolve(specifier, context, nextResolve) {
  const ext = path.extname(specifier)
  if (!exts.has(ext)) { return nextResolve(specifier) }
  const { url } = await nextResolve(specifier)

  return {
    format: 'zx',
    shortCircuit: true,
    url,
  }
}

export async function load(url, context, nextLoad) {
  if (context.format !== 'zx') { return nextLoad(url) }

  return {
    format: 'module',
    shortCircuit: true,
    source: '' + (await nextLoad(url, { ...context, format: 'module' })).source,
  }
}

 NODE_OPTIONS="--loader=./loader.mjs" ./my-script.zx