function beforeContentChunk(code) {
    if (code === codes.eof || markdownLineEnding(code)) {
      return effects.check(nonLazyContinuation, atNonLazyBreak, after)(code)
    }

    effects.enter(types.codeFlowValue)
    return contentChunk(code)
  }
Before code content, after optional prefix.

```markdown
  | ~~~js
> | alert(1)
    ^
  | ~~~
```

@type {State}