TypeScript 5.1 Support

[bradzacher]

https://devblogs.microsoft.com/typescript/announcing-typescript-5-1-beta/

This issue is just to track all of the new features and their implementation state in this project.
As with all releases, we will not necessarily to support all features until closer to the full release when everything the features are stabilised.

Please be patient.

✅ ES2020 and Node.js 14.17 as Minimum Runtime Requirements

As part of our upcoming v6 release we've bumped our minimum node to v16.

This does not impact us as it's up to the user to use a supported node version for their selected TS version.

✅ lib.d.ts Updates

We will need to regenerate our types within scope-manager.

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Other changes with no impact to us

• Easier Implicit Returns for undefined-Returning Functions
• Unrelated Types for Getters and Setters
• Decoupled Type-Checking Between JSX Elements and JSX Tag Types
• Namespaced JSX Attributes
  • TS already supported parsing namespaced attributes and we have AST types for it - so this is a no-op for us.
• typeRoots Are Consulted In Module Resolution
• Linked Cursors for JSX Tags
• Snippet Completions for @param JSDoc Tags
• Avoiding Unnecessary Type Instantiation
• Negative Case Checks for Union Literals
• Reduced Calls into Scanner for JSDoc Parsing
• Explicit typeRoots Disables Upward Walks for node_modules/@types

[Josef-Reichardt]

Typescript 5.1.3 is now officially released: https://github.com/microsoft/TypeScript/releases/tag/v5.1.3

So I think this is going to hit a lot of people from now on.

[bradzacher]

Please refrain from commenting asking for status updates and from posting the warning log our tool emits.

We are aware that 5.1 has released, and it is on our radar to support.

We volunteer maintainers will get to this when we have the bandwidth. Unfortunately of late we have all been tied up with personal matters.

It will not be in the next release (which I believe will automatically be cut in a few hours). We may be able to target next week, time permitting.

[bradzacher]

Just to close the loop for those waiting for true support.
We've hit a regression in TS 5.1 which is causing our tests to OOM.
We're working with the TS team to resolve this.

Based on Josh's work so far it looks like our tooling should be fine out-of-the-box on TS5.1 - but if you encounter weird behaviour please revert to TS5.0 and wait for us to officially release.