readdirRecursive.js

const { readdir } = require('fs').promises

const readdirRecursiveEnt = async (dir, ent) => {
  const path = `${dir}/${ent.name}`
  if (ent.isFile()) return path
  if (ent.isDirectory()) {
    return await readdirRecursive(path)
  }
  console.log(`${ent.name} is not a file or directory`)
  return null
}

const readdirRecursive = async (dir) => {
  const ents = await readdir(dir, { withFileTypes: true })
  return (await Promise.all(ents.map((ent) => readdirRecursiveEnt(dir, ent))))
    .filter(Boolean)
    .flat()
}

readdirRecursive('content/blog').then((files) => {
  console.log(files)
})