function start(code) {
    if (markdownLineEnding(code)) {
      effects.enter(types.lineEnding)
      effects.consume(code)
      effects.exit(types.lineEnding)
      return after
    }

    return nok(code)
  }
At eol, before continuation.

```markdown
> | * ```js
           ^
  | b
```

@type {State}