one/dist/esm/useLoader.mjs

One is a new React Framework that makes Vite serve both native and web.

import { useCallback, useSyncExternalStore } from "react";
import { useParams, usePathname } from "./hooks.mjs";
import { preloadedLoaderData, preloadingLoader } from "./router/router.mjs";
import { getLoaderPath } from "./utils/cleanUrl.mjs";
import { dynamicImport } from "./utils/dynamicImport.mjs";
import { weakKey } from "./utils/weakKey.mjs";
import { useServerContext } from "./vite/one-server-only.mjs";
const loaderState = {},
  subscribers = /* @__PURE__ */new Set();
function updateState(path, updates) {
  loaderState[path] = {
    ...loaderState[path],
    ...updates
  }, subscribers.forEach(callback => {
    callback();
  });
}
function subscribe(callback) {
  return subscribers.add(callback), () => subscribers.delete(callback);
}
function getLoaderState(path, preloadedData2) {
  return loaderState[path] || (loaderState[path] = {
    data: preloadedData2,
    error: void 0,
    promise: void 0,
    state: "idle",
    hasLoadedOnce: !!preloadedData2
  }), loaderState[path];
}
async function refetchLoader(pathname2) {
  updateState(pathname2, {
    state: "loading",
    error: null
  });
  try {
    const cacheBust = `${Date.now()}`,
      loaderJSUrl2 = getLoaderPath(pathname2, !0, cacheBust),
      result2 = await (await dynamicImport(loaderJSUrl2)).loader();
    updateState(pathname2, {
      data: result2,
      state: "idle",
      timestamp: Date.now(),
      hasLoadedOnce: !0
    });
  } catch (err) {
    throw updateState(pathname2, {
      error: err,
      state: "idle"
    }), err;
  }
}
function useLoaderState(loader) {
  const {
      loaderProps: loaderPropsFromServerContext,
      loaderData: loaderDataFromServerContext
    } = useServerContext() || {},
    params = useParams(),
    pathname = usePathname(),
    currentPath = pathname.replace(/\/index$/, "").replace(/\/$/, "") || "/";
  if (typeof window > "u" && loader) return {
    data: useAsyncFn(loader, loaderPropsFromServerContext || {
      path: pathname,
      params
    }),
    refetch: async () => {},
    state: "idle"
  };
  const serverContextPath = loaderPropsFromServerContext?.path,
    preloadedData = serverContextPath === currentPath ? loaderDataFromServerContext : void 0,
    loaderStateEntry = useSyncExternalStore(subscribe, () => getLoaderState(currentPath, preloadedData), () => getLoaderState(currentPath, preloadedData)),
    refetch = useCallback(() => refetchLoader(currentPath), [currentPath]);
  if (!loader) return {
    refetch,
    state: loaderStateEntry.state
  };
  if (!loaderStateEntry.data && !loaderStateEntry.promise && !loaderStateEntry.hasLoadedOnce && loader) {
    const resolvedPreloadData = preloadedLoaderData[currentPath];
    if (resolvedPreloadData !== void 0) delete preloadedLoaderData[currentPath], delete preloadingLoader[currentPath], loaderStateEntry.data = resolvedPreloadData, loaderStateEntry.hasLoadedOnce = !0;else if (preloadingLoader[currentPath]) {
      const promise2 = preloadingLoader[currentPath].then(val => {
        delete preloadingLoader[currentPath], delete preloadedLoaderData[currentPath], updateState(currentPath, {
          data: val,
          hasLoadedOnce: !0,
          promise: void 0
        });
      }).catch(err => {
        console.error("Error running loader()", err), delete preloadingLoader[currentPath], updateState(currentPath, {
          error: err,
          promise: void 0
        });
      });
      loaderStateEntry.promise = promise2;
    } else {
      const loadData = async () => {
          try {
            const loaderJSUrl = getLoaderPath(currentPath, !0),
              module = await dynamicImport(loaderJSUrl),
              result = await module.loader();
            updateState(currentPath, {
              data: result,
              hasLoadedOnce: !0,
              promise: void 0
            });
          } catch (err) {
            updateState(currentPath, {
              error: err,
              promise: void 0
            });
          }
        },
        promise = loadData();
      loaderStateEntry.promise = promise;
    }
  }
  if (loader) {
    if (loaderStateEntry.error && !loaderStateEntry.hasLoadedOnce) throw loaderStateEntry.error;
    if (loaderStateEntry.data === void 0 && loaderStateEntry.promise && !loaderStateEntry.hasLoadedOnce) throw loaderStateEntry.promise;
    return {
      data: loaderStateEntry.data,
      refetch,
      state: loaderStateEntry.state
    };
  } else return {
    refetch,
    state: loaderStateEntry.state
  };
}
function useLoader(loader2) {
  const {
    data: data2
  } = useLoaderState(loader2);
  return data2;
}
const results = /* @__PURE__ */new Map(),
  started = /* @__PURE__ */new Map();
function useAsyncFn(val, props) {
  const key = (val ? weakKey(val) : "") + JSON.stringify(props);
  if (val && !started.get(key)) {
    started.set(key, !0);
    let next = val(props);
    next instanceof Promise && (next = next.then(final => {
      results.set(key, final);
    }).catch(err => {
      console.error("Error running loader()", err), results.set(key, void 0);
    })), results.set(key, next);
  }
  const current = results.get(key);
  if (current instanceof Promise) throw current;
  return current;
}
export { refetchLoader, useLoader, useLoaderState };
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