Function expandBraces

src/utils/frontmatterParser.ts:240–266

* Expands brace patterns in a glob string. * @example * expandBraces("src/*.{ts,tsx}") // returns ["src/*.ts", "src/*.tsx"] * expandBraces("{a,b}/{c,d}") // returns ["a/c", "a/d", "b/c", "b/d"]

(pattern: string)

 * expandBraces("{a,b}/{c,d}") // returns ["a/c", "a/d", "b/c", "b/d"]
 */
function expandBraces(pattern: string): string[] {
  // Find the first brace group
  const braceMatch = pattern.match(/^([^{]*)\{([^}]+)\}(.*)$/)

  if (!braceMatch) {
    // No braces found, return pattern as-is
    return [pattern]
  }

  const prefix = braceMatch[1] || ''
  const alternatives = braceMatch[2] || ''
  const suffix = braceMatch[3] || ''

  // Split alternatives by comma and expand each one
  const parts = alternatives.split(',').map(alt => alt.trim())

  // Recursively expand remaining braces in suffix
  const expanded: string[] = []
  for (const part of parts) {
    const combined = prefix + part + suffix
    // Recursively handle additional brace groups
    const furtherExpanded = expandBraces(combined)
    expanded.push(...furtherExpanded)
  }

  return expanded
}

/**
 * Parses a positive integer value from frontmatter.