sama-loader.mjs

import path from "node:path"
import fs from "node:fs"

const SAMA_ALIAS = "@sama"
const SAMA_XMPP_ALIAS = "@sama-xmpp"

const loaderFilePath = new URL(import.meta.url).pathname
const dirPath = path.dirname(loaderFilePath)

const samaCoreDirPath = path.join(dirPath, "app")
const samaXmppApiDirPath = path.join(dirPath, "APIs", "XMPP")
const samaXmppApiIndexPath = path.join(samaXmppApiDirPath, "index.js")

const samaXmppApiExists = fs.existsSync(samaXmppApiIndexPath)

export async function resolve(specifier, context, nextResolve) {
  if (specifier.startsWith(`${SAMA_ALIAS}/`)) {
    const filePath = specifier.replace(`${SAMA_ALIAS}/`, "")

    const fileFullPath = path.join(samaCoreDirPath, filePath)

    return {
      shortCircuit: true,
      url: new URL(`file://${fileFullPath}`).href,
    }
  }

  if (specifier.startsWith(`${SAMA_XMPP_ALIAS}/`)) {
    const filePath = specifier.replace(`${SAMA_XMPP_ALIAS}/`, "")

    const fileFullPath = path.join(samaXmppApiDirPath, filePath)

    return {
      shortCircuit: true,
      url: new URL(`file://${fileFullPath}`).href,
    }
  }

  return nextResolve(specifier)
}

export async function load(url, context, nextLoad) {
  const { format } = context

  if (url.includes(samaXmppApiIndexPath) && !samaXmppApiExists) {
    return {
      format: format || "module",
      shortCircuit: true,
      source: "export default null",
    }
  }

  return nextLoad(url)
}