export declare const removeDoubleSlash: (url: string) => string;
export declare const getAbsoluteUrl: (url: string) => string;
export declare const appendTrailingSlash: (url: string) => string;
export declare const appendPath: (base: string, path: string) => string;
export declare const resolveManifestBaseUrl: (hostUrl: string, manifestPath: string) => string;
export declare const resolveManifestUrl: (hostUrl: string, manifestPath: string) => string;
export declare const isJSDOM: () => boolean;
export declare const escapeRegExp: (str: string) => string;
/**
 * Rewrites a child iframe `src` so it is same-origin with the document that
 * creates it.
 *
 * App Bridge must read and mutate the child iframe's `contentDocument` after
 * load (inject `<base href>`, etc.). Browsers only expose `contentDocument`
 * when the iframe URL shares the creator's origin.
 *
 * Consider a three-level stack — **grandparent → parent → child** (e.g.
 * encw → prospects → incomplete-apps):
 *
 * - **Grandparent** hosts the parent inside its iframe (e.g. encw at
 * `http://localhost:3000`).
 * - **Parent** is a guest of the grandparent but acts as a **host** when it
 * opens the child. Its JavaScript runs in the grandparent's iframe document
 * (e.g. `http://localhost:3000/latest/frame.html`), not on the parent's
 * dev-server origin (e.g. `http://localhost:4004`).
 * - **Child** is loaded by the parent via App Bridge. The bundled default
 * `frame.html` URL is built from the parent's build and often points at the
 * parent's or child's dev-server origin (e.g. `:4004` or `:8080`).
 *
 * If the parent creates the child's iframe with that cross-origin `frame.html`
 * URL while its own code executes on `:3000`, the browser treats the child
 * shell as cross-origin. `Frame.create` cannot access `contentDocument` and
 * times out after 10s.
 *
 * When origins differ, this helper rewrites the src to
 * `{window.location.origin}/{version}/frame.html` — the **parent document's**
 * origin (which, when nested, is the grandparent's iframe origin). The child's
 * JS bundles are still fetched from the correct guest URL via `<base href>`.
 * @param frameSrc - Raw iframe src from bundled `frame.html` or caller
 *   `frameOptions.src`.
 * @returns The original src when already same-origin; otherwise a same-origin
 *   `frame.html` URL. On parse failure, returns `frameSrc` unchanged.
 */
export declare const resolveSameOriginFrameSrc: (frameSrc: string) => string;