Function objcSelectorForSwiftInit

src/resolution/swift-objc-bridge.ts:117–147

(
  externalLabels: (string | null)[],
  internalNames: string[],
  explicitObjcName?: string | null
)

 * passed via `internalNames`.
 */
export function objcSelectorForSwiftInit(
  externalLabels: (string | null)[],
  internalNames: string[],
  explicitObjcName?: string | null
): string | null {
  if (explicitObjcName) return explicitObjcName;

  if (externalLabels.length === 0) {
    return 'init';
  }

  const [firstExt, ...restExt] = externalLabels;
  const [firstInt] = internalNames;
  // Use the internal name when external is "_"; ObjC needs *some* keyword,
  // and Swift's auto-bridger uses the parameter's local name in this case.
  const firstLabel =
    firstExt === null || firstExt === '_' || firstExt === ''
      ? firstInt
      : firstExt;
  if (!firstLabel) return null;

  const firstKeyword = `initWith${capFirst(firstLabel)}:`;
  const restKeywords = restExt
    .map((label, idx) => {
      const internal = internalNames[idx + 1];
      const name = label && label !== '_' ? label : internal ?? '';
      return `${name}:`;
    })
    .join('');
  return firstKeyword + restKeywords;
}

/**
 * Compute the bridged ObjC getter + setter for a Swift `@objc` property.