/**
 * A type that represents an allowed origin definition.
 *
 * An allowed origin can be:
 * - `true` to allow all origins
 * - `false` to disallow all origins
 * - a string to allow a specific origin
 * - a regular expression to allow origins that match the pattern
 * - an array of strings and/or regular expressions to allow multiple origins that match any of the
 *   entries in the array
 */
export type AllowedOrigin = boolean | string | RegExp | Array<string | RegExp>;
export declare function isOriginAllowed(requestOrigin: string, origin: AllowedOrigin): boolean;