test-repo/tests/config/get-prettier.js

import path from "node:path";
import { pathToFileURL } from "node:url";

function getPrettierInternal() {
  if (process.env.TEST_RUNTIME === "browser") {
    return import("./browser/browser-prettier.js").then(
      ({ prettier }) => prettier,
    );
  }

  if (process.env.TEST_STANDALONE) {
    const entry = new URL("./require-standalone.cjs", import.meta.url);
    return import(entry).then((module) => module.default);
  }

  const { PRETTIER_INSTALLED_DIR } = process.env;

  if (PRETTIER_INSTALLED_DIR) {
    return import(
      pathToFileURL(path.join(PRETTIER_INSTALLED_DIR, "index-proxy.mjs"))
    );
  }

  const entry = pathToFileURL(
    path.join(
      process.env.PRETTIER_DIR,
      process.env.NODE_ENV === "production" ? "index.mjs" : "index.js",
    ),
  );
  return import(entry);
}

let promise;
function getPrettier() {
  promise = promise ?? getPrettierInternal();

  return promise;
}

export default getPrettier;