src/plugin-sdk/allow-from.ts

export function formatAllowFromLowercase(params: {
  allowFrom: Array<string | number>;
  stripPrefixRe?: RegExp;
}): string[] {
  return params.allowFrom
    .map((entry) => String(entry).trim())
    .filter(Boolean)
    .map((entry) => (params.stripPrefixRe ? entry.replace(params.stripPrefixRe, "") : entry))
    .map((entry) => entry.toLowerCase());
}