---
title: file_extensions | CodeWeaver Docs
description: API reference for codeweaver.core.file_extensions
url: "https://docs.knitli.com/api/core/file_extensions"
type: static
generatedAt: "2026-04-17T17:21:08.030Z"
---

# file_extensions
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# `codeweaver.core.file_extensions`
[Section titled “codeweaver.core.file_extensions”](#codeweavercorefile_extensions)
Constants used throughout the CodeWeaver project, primarily for default configurations.

## Class: `FallBackTestDef`
[Section titled “Class: FallBackTestDef”](#class-fallbacktestdef)
Definition for a fallback test based on file content.

## Function: `all_js_exts`
[Section titled “Function: all_js_exts”](#function-all_js_exts)

**

```
all_js_exts()
```

Return all common JavaScript-related extensions for a given stem.

Args: stem: The file stem (name without extension).

Returns: A tuple of file names with common JavaScript-related extensions. Does not include `.jsx` or `.tsx` extensions.