Function parseYamlFrontmatter

packages/convert/src/quarto-to-deepnote.ts:144–169

* Parses YAML frontmatter string into a QuartoFrontmatter object. * Uses the yaml package to properly handle nested objects, arrays, and all YAML features.

(yamlString: string)

 * Uses the yaml package to properly handle nested objects, arrays, and all YAML features.
 */
function parseYamlFrontmatter(yamlString: string): QuartoFrontmatter {
  // Handle empty input
  if (!yamlString || yamlString.trim() === '') {
    return {}
  }

  try {
    const parsed = parseYaml(yamlString)

    // If parsing returns null or undefined, return empty object
    if (parsed === null || parsed === undefined) {
      return {}
    }

    // Ensure the result is an object (not a primitive or array)
    if (typeof parsed !== 'object' || Array.isArray(parsed)) {
      return {}
    }

    return parsed as QuartoFrontmatter
  } catch {
    // If YAML parsing fails, return empty object
    // In production, you might want to log this error
    return {}
  }
}

/**
 * Parses Quarto cell options from #| lines.