function sequenceCloseAfter(code) {
      if (code === codes.eof || markdownLineEnding(code)) {
        effects.exit(types.codeFencedFence)
        return ok(code)
      }

      return nok(code)
    }
After closing fence sequence, after optional whitespace.

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

@type {State}