/**
 * Shared wire protocol for the iframe-resize parent/child pair.
 *
 * Both ends are part of this codebase, so we use a private, namespaced
 * postMessage protocol rather than matching any third-party format. Every
 * message carries `kind: MSG_PREFIX` so unrelated postMessages are ignored.
 *
 * Keep this file in sync with the copy bundled into the checkout child app.
 */
/** Namespacing marker present on every message we send/accept. */
export declare const MSG_PREFIX: "[dodo-iframe-resize]";
export type Direction = "vertical" | "horizontal" | "both" | "none";
/** Messages the child sends up to the parent window. */
export type ChildToParentMessage = {
    kind: typeof MSG_PREFIX;
    type: "child-ready";
} | {
    kind: typeof MSG_PREFIX;
    type: "size";
    height: number;
    width: number;
} | {
    kind: typeof MSG_PREFIX;
    type: "message";
    message: unknown;
};
/** Messages the parent sends down to the child window. */
export type ParentToChildMessage = {
    kind: typeof MSG_PREFIX;
    type: "parent-ping";
} | {
    kind: typeof MSG_PREFIX;
    type: "parent-ack";
} | {
    kind: typeof MSG_PREFIX;
    type: "message";
    message: unknown;
};