MD040 - Code blocks should have a language specified¶

Aliases: fenced-code-language

What this rule does¶

Ensures code blocks (```) specify what programming language they contain.

Syntax highlighting: Editors and renderers can color-code the syntax correctly
Clarity: Readers immediately know what language they're looking at
Tools: Some tools use language hints for processing or validation

```python
def hello():
    print("Hello, world!")
```

```javascript
console.log("Hello, world!");
```

```bash
echo "Hello, world!"
```

```
def hello():
    print("Hello, world!")
```

```
console.log("Hello, world!");
```

```text
def hello():
    print("Hello, world!")
```

```text
console.log("Hello, world!");
```

Note: The fix adds text as a default language hint when none is specified.

This rule has no configuration options.

This rule automatically adds text as the language specifier for code blocks without one.