> For the complete documentation index, see [llms.txt](https://typescript-jp.gitbook.io/deep-dive/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://typescript-jp.gitbook.io/deep-dive/overview/checker/checker-diagnostics.md).

# Checker Error Reporting

Checkerはローカルの`error`関数を使用してエラーを報告します。下記がその関数です:

```typescript
function error(location: Node, message: DiagnosticMessage, arg0?: any, arg1?: any, arg2?: any): void {
    let diagnostic = location
        ? createDiagnosticForNode(location, message, arg0, arg1, arg2)
        : createCompilerDiagnostic(message, arg0, arg1, arg2);
    diagnostics.add(diagnostic);
}
```