Bug Report

🔎 Search Terms

🕗 Version & Regression Information

This is new code, but I'm using 3.8.3. Still occurs in 4.2.3. I asked in the Discord and they said it looks like a bug.

⏯ Playground Link

Playground link with relevant code

💻 Code

type UserRecord = {name: string}
async function listUsers(token: string|undefined) {
    return {users: [{uid: 1, name: 'Gary'}], pageToken: 'b'}
}

export async function listAuthUsers() {
  let nextPageToken = undefined
  const users: {[uid: string]: UserRecord} = {}
  do {
    const usersList = await listUsers(nextPageToken) // <<<< ERROR 7022 here
    usersList.users.forEach((user) => {
      users[user.uid] = user
    })
    nextPageToken = usersList.pageToken // <<< ERROR DISAPPEARS IF THIS LINE IS COMMENTED OUT
  } while (nextPageToken)
}

🙁 Actual behavior

Code above gives error 7022. If you comment out the line nextPageToken = usersList.pageToken then it's OK.

User webstrand on the discord says "even weirder - just the presence of an unused generic causes this issue" with this playground link

and user T6 on discord commented "The reason it's giving that error is CFA
Because the type of nextPageToken depends on usersList, which depends on nextPageToken
Though interestingly it shouldn't really depend on nextPageToken."

🙂 Expected behavior

No error.