This feature allows the Typescript language service to automatically refactor code that uses Promise methods such as .then() or .catch() to instead use the async and await keywords.

Async/await offers many advantages over promise methods including cleaner syntax, error handling, debugging, and readability. The benefits of the synchronous style code provided by async/await are largely recognized by the Javascript community. However, there is still a substantial amount of asynchronous code written using Promises. This feature provides a quick and simple transition to using the async/await keywords.

Demo:

TL;DR: A pattern based approach to automatically refactor Promise code in Typescript
Related Links: Typescript Blog Post, Proposal, Code