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Nov 24, 2025
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Update readme, issue template #2140

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Mention that we target TS 5.9 instead of TS 5.8
jakebailey Nov 20, 2025
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jakebailey Nov 20, 2025
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jakebailey Nov 20, 2025
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4 changes: 2 additions & 2 deletions .github/ISSUE_TEMPLATE/02-behavior-difference.md
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@@ -1,6 +1,6 @@
---
name: Behavior Difference
about: tsgo produces different results than TypeScript 5.8
about: tsgo produces different results than TypeScript 5.9
title: ''
labels: ''
assignees: ''
Expand All @@ -11,6 +11,6 @@ assignees: ''

<!-- Share a repository link or a code sample -->

## Behavior with `typescript@5.8`
## Behavior with `typescript@5.9`

## Behavior with `tsgo`
14 changes: 7 additions & 7 deletions README.md
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Expand Up @@ -27,19 +27,19 @@ This is still a work in progress and is not yet at full feature parity with Type

| Feature | Status | Notes |
|---------|--------|-------|
| Program creation | done | Same files and module resolution as TS 5.8. Not all resolution modes supported yet. |
| Parsing/scanning | done | Exact same syntax errors as TS 5.8 |
| Commandline and `tsconfig.json` parsing | mostly done | Missing --help, --init. |
| Type resolution | done | Same types as TS 5.8. |
| Type checking | done | Same errors, locations, and messages as TS 5.8. Types printback in errors may display differently. |
| Program creation | done | Same files and module resolution as TS 5.9. Not all resolution modes supported yet. |
| Parsing/scanning | done | Exact same syntax errors as TS 5.9 |
| Commandline and `tsconfig.json` parsing | done | Done, though `tsconfig` errors may not be as helpful. |
| Type resolution | done | Same types as TS 5.9. |
| Type checking | done | Same errors, locations, and messages as TS 5.9. Types printback in errors may display differently. |
| JavaScript-specific inference and JSDoc | in progress | Mostly complete, but intentionally lacking some features. Declaration emit not complete. |
| JSX | done | - |
| Declaration emit | in progress | Most common features are in place, but some edge cases and feature flags are still unhandled. |
| Emit (JS output) | in progress | `target: esnext` well-supported, other targets may have gaps. |
| Watch mode | prototype | Watches files and rebuilds, but no incremental rechecking. Not optimized. |
| Build mode / project references | done | - |
| Incremental build | done | - |
| Language service (LSP) | in progress | Some functionality (errors, hover, go to def, refs, sig help). More features coming soon. |
| Language service (LSP) | in progress | Most functionality. More features coming soon. |
| API | not ready | - |

Definitions:
Expand All @@ -54,7 +54,7 @@ Definitions:
Long-term, we expect that this repo and its contents will be merged into `microsoft/TypeScript`.
As a result, the repo and issue tracker for typescript-go will eventually be closed, so treat discussions/issues accordingly.

For a list of intentional changes with respect to TypeScript 5.7, see CHANGES.md.
For a list of intentional changes with respect to TypeScript 5.9, see CHANGES.md.

## Contributing

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