[Rule Request] prefer-async

[Lonli-Lokli]

Rule Suggestion

Warn or error the case when Promise.then() syntax is used instead of await.

instead of
promise.then(() => {do smth})

await prmise();
{do smth}

[JoshuaKGoldberg]

Agreed, this would be a good rule. TypeScript can suggest this itself with microsoft/TypeScript#25082. Should TSLint use the TypeScript diagnostics for inference and suggestions? Is such a thing reasonably possible (#4100 / #4215)?

[JoshuaKGoldberg]

Note: per #4534, this issue will be closed in less than a month if no PR is sent to add the rule. If you really need the rule, custom rules are always an option and can be maintained outside this repo!

[JoshuaKGoldberg]

💀 It's time! 💀

TSLint is being deprecated and no longer accepting pull requests for new rules. See #4534. 😱

If you'd like to see this rule implemented, you have two choices:

• Recommended: Use typescript-eslint to lint your TypeScript code with ESLint ✅
• Legacy: Write it as a custom TSLint rule 🤷‍♂️

👋 It was a pleasure open sourcing with you!

If you believe this message was posted here in error, please comment so we can re-open the issue!

[JoshuaKGoldberg]

🤖 Beep boop! 👉 TSLint is deprecated 👈 (#4534) and you should switch to typescript-eslint! 🤖

🔒 This issue is being locked to prevent further unnecessary discussions. Thank you! 👋