Node.js get input stream from stdin or globed file list

input.mjs

import { readFile } from "node:fs/promises"
let { debug } = console

export async function* getInputStream(sources = process.argv.slice(2)) {
  if (sources.length === 0) {
    debug('stdin')
    let data = ""
    for await (let chunk of process.stdin) {
      data += chunk
    }
    yield data
  } else {
    debug('files', sources)
    for (let file of sources) {
      try {
        yield readFile(file, "utf8")
      } catch (e) {
        debug(e)
      }
    }
  }
}

export async function getInputString(separator = "\n\n") {
  let parts = [];
  for await (let chunk of getInputStream()) {
    parts.push(chunk);
  }
  return parts.join(separator);
}