Function bootstrap

src/bootstrap.js:15–43

import {setScriptSrc} from './setScriptSrc.js';

export const bootstrap = bootstrapParams => {
  var bootstrapPromise;
  var script;
  var bootstrapParamsKey;
  var PRODUCT_NAME = "The Google Maps JavaScript API";
  var GOOGLE = "google";
  var IMPORT_API_NAME = "importLibrary";
  var PENDING_BOOTSTRAP_KEY = "__ib__";
  var doc = document;
  var global_ = window;
  var google_ = global_[GOOGLE] || (global_[GOOGLE] = {});
  var namespace = google_.maps || (google_.maps = {});
  var libraries = new Set();
  var searchParams = new URLSearchParams();
  var triggerBootstrap = () => bootstrapPromise || (bootstrapPromise = new Promise(async(resolve, reject) => {
    await (script = doc.createElement("script"));
    searchParams.set("libraries", [...libraries] + "");
    for (bootstrapParamsKey in bootstrapParams) {
      searchParams.set(bootstrapParamsKey.replace(/[A-Z]/g, g => "_" + g[0].toLowerCase()), bootstrapParams[bootstrapParamsKey]);
    }
    searchParams.set("callback", GOOGLE + ".maps." + PENDING_BOOTSTRAP_KEY);
    setScriptSrc(script, "https://maps.googleapis.com/maps/api/js?" + searchParams);
    namespace[PENDING_BOOTSTRAP_KEY] = resolve;
    script.onerror = () => bootstrapPromise = reject(Error(PRODUCT_NAME + " could not load."));
    script.nonce = doc.querySelector("script[nonce]")?.nonce || "";
    doc.head.append(script);
  }));
  namespace[IMPORT_API_NAME] ? console.warn(PRODUCT_NAME + " only loads once. Ignoring:", bootstrapParams) : namespace[IMPORT_API_NAME] = (libraryName, ...args) => libraries.add(libraryName) && triggerBootstrap().then(() => namespace[IMPORT_API_NAME](libraryName, ...args));
};