Function replaceDestination

packages/next-routing/src/destination.ts:5–38

(
  destination: string,
  regexMatches: RegExpMatchArray | null,
  hasCaptures: Record<string, string>
)

 * with matches from the regex and has conditions
 */
export function replaceDestination(
  destination: string,
  regexMatches: RegExpMatchArray | null,
  hasCaptures: Record<string, string>
): string {
  let result = destination

  // Replace numbered captures from regex ($1, $2, etc.)
  if (regexMatches) {
    // Replace numbered groups (skip index 0 which is the full match)
    for (let i = 1; i < regexMatches.length; i++) {
      const value = regexMatches[i]
      if (value !== undefined) {
        result = result.replace(new RegExp(`\\$${i}`, 'g'), value)
      }
    }

    // Replace named groups ($name)
    if (regexMatches.groups) {
      for (const [name, value] of Object.entries(regexMatches.groups)) {
        if (value !== undefined) {
          result = result.replace(new RegExp(`\\$${name}`, 'g'), value)
        }
      }
    }
  }

  // Replace named captures from has conditions
  for (const [name, value] of Object.entries(hasCaptures)) {
    result = result.replace(new RegExp(`\\$${name}`, 'g'), value)
  }

  return result
}

/**
 * Checks if a destination is an external rewrite (starts with http/https)