TSC 4.8.4 hangs up when compiling a small file

[cassioarosa]

Bug Report

The issue can be seeing in playground by switching from .js tab to another tab, then switching back go .js tab. Image below.

When compiling the file via, npx tsc filename.ts the compilation takes to long to produce a result.

When using ts-jest was not possible to get a result, the test keeps running.

🔎 Search Terms

• TSC Hang up
• Version 4.8.4

⏯ Playground Link

Link

💻 Code

import { Collection } from "mongodb";

function getCollection<TSchema extends Document = Document>(
  name: string
): Collection<TSchema> {
  const value: any = null;

  return value;
}

async function foo() {
  await getCollection("COLLECTION_NAME").deleteMany({});
}

🙁 Actual behavior

🙂 Expected behavior

If possible, a faster response.

Possible related issues

• tsc 4.7 - 4.8.4 hangs indefinitely #51335
• Possible memory-leak or infinite recursion in type-checking algorithm. #47810

[ahejlsberg]

Short story... The mongodb types are creating insane amounts of work when passed a relatively large type such as Document. The compiler eventually reports a "Type instantiation is excessively deep and possibly infinite" error, but with these particular types it takes a while to reach the 5M types required to trigger the type instantiation limiter.

[typescript-bot]

This issue has been marked as 'External' and has seen no recent activity. It has been automatically closed for house-keeping purposes.