Ryan Cavanaugh

Missing error when reference directive file path doesn't exist

2

## Steps to reproduce ```ts /// ``` ## Behavior with `[email protected]` error: ``` D:\Throwaway\corsarepro>tsc a.ts:1:22 - error TS6053: File 'D:/Throwaway/corsarepro/notfound.d.ts' not found. 1 /// ~~~~~~~~~~~~~ Found 1 error in a.ts:1...

Missing error when shadowing WeakMap/WeakSet in class private field's scope

1

## Steps to reproduce ``` function test() { let WeakMap; ~~~~~~~ !!! error TS18027: Compiler reserves name 'WeakMap' when emitting private identifier downlevel. let WeakSet; ~~~~~~~ !!! error TS18027: Compiler...

Missing config error for using module=none

2

## Steps to reproduce a.ts ```ts export const n = 0; ``` ## Behavior with `[email protected]` ``` D:\Throwaway\corsarepro>tsc --module none a.ts a.ts:1:1 - error TS1148: Cannot use imports, exports, or...

## Steps to reproduce ``` D:\Throwaway\corsarepro>tsc --incremental a.ts error TS5074: Option '--incremental' can only be specified using tsconfig, emitting to single file or when option '--tsBuildInfoFile' is specified. Found 1...

Deprecate `module` syntax

13

See #54500 Fixes #62211 This changes the existing suggestion diagnostic to an error when you write forms like `module foo` or `module foo.bar {` ~The ambient form `declare module foo...

Numeric Range Types (Feature Update)

22

# Feature Update: Numeric Ranges This is a [Feature Update](https://github.com/microsoft/TypeScript/issues/54923) for #15480. ## What's the Proposal? The general idea is that you'd be able to write a type which represents...

Closing TS 6.0 LS issues

9

### Acknowledgement - [x] I acknowledge that issues using this template may be closed without further explanation at the maintainer's discretion. ### Comment [As discussed in our December blog post](https://devblogs.microsoft.com/typescript/progress-on-typescript-7-december-2025/#resetting-language-service-issues),...