Remix路由模块输出对象loader函数详解

import { json } from "@remix-run/node"; // or cloudflare/deno
export const loader = async () => {
  return json({ ok: true });
};
export default function Users() {
  const data = useLoaderData();
  return (
    <>{JSON.stringly(data)}</>
  );
}

export const loader = () => {
  json({jsonKey: "jsonValue"})
}
export const loader = () => {
  json({jsonKey: "jsonValue"}, {
    status: 200,
    headers: {
      "Cache-Control": "no-store"
    }
  })
}

import { defer } from "@remix-run/node"; // or cloudflare/deno
export const loader = async () => {
  const thePromise = loadSlowDataAsync(); // 产生一个 Promise 值
  // So you can write this without awaiting the promise:
  return defer({
    critical: "data",
    slowPromise: thePromise, // 直接将 Promise 的值交给 defer
  });
};

import { defer } from "@remix-run/node";
import { Await, useLoaderData } from "@remix-run/react";
import { Suspense } from "react";
export const loader = () => {
  let p = new Promise((resolve) => {
    setTimeout(() => {
      resolve("defer a promise value");
    }, 2000);
  });
  return defer({
    pv: p,
  });
};
export default function Defer() {
  const data = useLoaderData();
  console.log(data);
  return (
    <div>
      <div>This is defer value: </div>
      <Suspense fallback={<div>Loading...</div>}>
        <Await resolve={data.pv}>{(data) => <div>{data}</div>}</Await>
      </Suspense>
    </div>
  );

export async function loader() {
  const body = JSON.stringify({ loader: "loader data"});
  return new Response(body, {
    headers: {
      "Content-Type": "application/json",
    },
  });
}
export default function() {
  return <div>loader.response</div>
}

import type { LoaderArgs } from "@remix-run/node";
import { json } from "@remix-run/node";
import { useLoaderData } from "@remix-run/react";
export async function loader(args: LoaderArgs) {
  return json({ name: "Ryan", date: new Date() });
}
export default function SomeRoute() {
  const data = useLoaderData<typeof loader>();
}

export async function loader({ params }: LoaderArgs) {
  let id = params.id; // "123"
}

export async function loader({ request }: LoaderArgs) {
  // read a cookie
  const cookie = request.headers.get("Cookie");
  // parse the search params for `?q=`
  const url = new URL(request.url);
  const query = url.searchParams.get("q");
}

const {
  createRequestHandler,
} = require("@remix-run/express");
// 对所有的请求，创建一个对象，提供上下文
app.all(
  "*",
  createRequestHandler({
    getLoadContext(req, res) {
      // this becomes the loader context
      return { expressUser: req.user };
    },
  })
);
// 在 loader 中使用上下文
export async function loader({ context }: LoaderArgs) {
  const { expressUser } = context;
  // ...
}

import { redirect } from "@remix-run/node";
export async function loader() {
  return redirect('/abc')
}
export default function() {
  return <div>loader.response</div>
}

throw json(
      { invoiceOwnerEmail: invoice.owner.email },
      { status: 401 }
    );

export function CatchBoundary() {
  // this returns { data, status, statusText }
  const caught = useCatch<ThrownResponses>();
  switch (caught.status) {
    case 401:
      return (
        <div>
          <p>You don't have access to this invoice.</p>
          <p>
            Contact {caught.data.invoiceOwnerEmail} to get
            access
          </p>
        </div>
      );
    case 404:
      return <div>Invoice not found!</div>;
  }
  // You could also `throw new Error("Unknown status in catch boundary")`.
  // This will be caught by the closest `ErrorBoundary`.
  return (
    <div>
      Something went wrong: {caught.status}{" "}
      {caught.statusText}
    </div>
  );
}

export const loader = () => {
  return {
    a: 1
  }
}