Trying to test firebase rules with emulator

Question

I'm trying to setup my testEnvironment for testing my firestore rules with my locally running emulator.

When i try to access testEnv it is undefined, and I guess that has something to do with initializeTestEnvironment being asynchronous, but how do I get around that?

import {
    assertFails,
    assertSucceeds,
    initializeTestEnvironment,
    RulesTestEnvironment,

  } from "@firebase/rules-unit-testing"

import fs from 'fs'

const projectId = 'comment-section-e9c09';

let testEnv:RulesTestEnvironment;

beforeAll( async () => {
  let testEnv = await initializeTestEnvironment({
    projectId: projectId,
    firestore: {
      rules: fs.readFileSync("firestore.rules", "utf8"),
      host:'localhost',
      port:8080
    },
  });
})

test("should clear db",() => {
  testEnv.clearDatabase()
})