tsz-core 0.1.9

Core TypeScript compiler and type checker library
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# Project Zang

Project Zang is a performance-first TypeScript compiler in Rust.<sup>[1](#footnote-1)</sup>
The goal is a correct, fast, drop-in replacement for `tsc`, with both native and WASM targets.

TypeScript is intentionally unsound. Zang keeps a sound core solver and layers a compatibility
engine on top to match TypeScript behavior while preserving correctness where possible.

## Progress

> [!WARNING]
> This project is not ready for general use yet.

<!-- TS_VERSION_START -->
Currently targeting `TypeScript`@`6.0.0-dev.20260215`
<!-- TS_VERSION_END -->

### Type Checker

To ensure tsz is a drop-in replacement for `tsc`, we run the official TypeScript conformance
test suite against it.


<!-- CONFORMANCE_START -->
```
Progress: [█████████████░░░░░░░] 62.7% (7,884/12,574 tests)
```
<!-- CONFORMANCE_END -->

Conformance is measured by diagnostic fingerprint comparison: each diagnostic must match tsc in
error code, file, line, column, and message.

### Emitter

We compare tsz JavaScript/declaration emit output against TypeScript's baseline files
to ensure correct code generation.

<!-- EMIT_START -->
```
JavaScript:  [██████████████░░░░░░] 71.3% (9,710 / 13,623 tests)
Declaration: [████████░░░░░░░░░░░░] 39.0% (776 / 1,989 tests)
```
<!-- EMIT_END -->

### Language Service

We run TypeScript's fourslash language service tests against `tsz-server` to measure
language service feature coverage (completions, quickinfo, go-to-definition, etc.).

<!-- FOURSLASH_START -->
```
Progress: [████░░░░░░░░░░░░░░░░] 18.3% (1,204 / 6,564 tests)
```
<!-- FOURSLASH_END -->


<a id="footnote-1">1</a>: "Zang" is the Persian word for "rust".