@storybook/addon-mcp/dist/preview.js

Help agents automatically write and test stories for your UI components

// src/constants.ts
var MCP_APP_PARAM = "mcp-app", MCP_APP_SIZE_CHANGED_EVENT = "storybook-mcp:size-changed";

// src/preview.ts
var isMcpApp = new URLSearchParams(window.location.search).has(MCP_APP_PARAM);
if (isMcpApp) {
  let sendSizeToParent2 = function() {
    let height = document.body.scrollHeight;
    Math.abs(height - lastSentHeight) <= 2 || (lastSentHeight = height, window.parent.postMessage(
      {
        type: MCP_APP_SIZE_CHANGED_EVENT,
        height
      },
      "*"
    ));
  }, debouncedSendSize2 = function() {
    debounceTimer && clearTimeout(debounceTimer), debounceTimer = setTimeout(sendSizeToParent2, DEBOUNCE_MS);
  };
  sendSizeToParent = sendSizeToParent2, debouncedSendSize = debouncedSendSize2;
  let SIZE_CHANGE_THRESHOLD = 2, debounceTimer = null, lastSentHeight = 0, DEBOUNCE_MS = 100;
  document.readyState === "loading" ? document.addEventListener("DOMContentLoaded", sendSizeToParent2) : sendSizeToParent2(), window.addEventListener("load", sendSizeToParent2), new ResizeObserver(debouncedSendSize2).observe(document.body), new MutationObserver(debouncedSendSize2).observe(document.body, {
    childList: !0,
    subtree: !0,
    attributes: !0
  });
}
var sendSizeToParent, debouncedSendSize;