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chore(server): rewrite resolveHTTPResponse with Fetch (#5684)
 --------- Co-authored-by: Nick Lucas <me@nicklucas.co.uk> Co-authored-by: Sheraff <fpellet@ensc.fr>
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‎.gitignore‎

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public/uploads

‎README.md‎

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# Next.js + tRPC + `FormData`
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This example showcases how to use tRPC with `FormData`.
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## Setup
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```bash
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npx create-next-app --example https://github.com/trpc/trpc --example-path examples/next-formdata trpc-formdata
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cd trpc-formdata
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npm i
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npm run dev
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```

‎next-env.d.ts‎

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/// <reference types="next" />
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/// <reference types="next/image-types/global" />
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// NOTE: This file should not be edited
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// see https://nextjs.org/docs/basic-features/typescript for more information.

‎next.config.js‎

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/** @type {import("next").NextConfig} */
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module.exports = {
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/** We run eslint as a separate task in CI */
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eslint: { ignoreDuringBuilds: !!process.env.CI },
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};

‎package.json‎

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{
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"name": "examples-next-formdata",
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"private": true,
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"scripts": {
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"dev": "next dev",
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"build": "next build",
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"lint": "eslint --ext \".js,.ts,.tsx\" src",
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"start": "next start"
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},
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"dependencies": {
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"@hookform/error-message": "^2.0.1",
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"@hookform/resolvers": "^2.9.11",
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"@tanstack/react-query": "^5.25.0",
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"@trpc/client": "npm:@trpc/client@next",
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"@trpc/next": "npm:@trpc/next@next",
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"@trpc/react-query": "npm:@trpc/react-query@next",
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"@trpc/server": "npm:@trpc/server@next",
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"next": "^14.1.4",
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"react": "^18.3.0",
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"react-dom": "^18.3.0",
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"react-hook-form": "^7.43.3",
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"zod": "^3.0.0",
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"zod-form-data": "^2.0.1"
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},
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"devDependencies": {
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"@types/node": "^20.10.0",
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"@types/react": "^18.3.0",
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"@types/react-dom": "^18.3.0",
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"eslint": "^8.56.0",
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"typescript": "^5.4.0"
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}
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}

‎src/pages/_app.tsx‎

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import type { AppType } from 'next/app';
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import { trpc } from '../utils/trpc';
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const MyApp: AppType = ({ Component, pageProps }) => {
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return <Component {...pageProps} />;
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};
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export default trpc.withTRPC(MyApp);

‎src/pages/api/trpc/[trpc].ts‎

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/**
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* This is the API-handler of your app that contains all your API routes.
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* On a bigger app, you will probably want to split this file up into multiple files.
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*/
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import * as trpcNext from '@trpc/server/adapters/next';
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import { roomRouter } from '~/server/routers/room';
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import { createContext, router } from '~/server/trpc';
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import type { NextApiRequest, NextApiResponse } from 'next';
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const appRouter = router({
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room: roomRouter,
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});
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// export only the type definition of the API
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// None of the actual implementation is exposed to the client
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export type AppRouter = typeof appRouter;
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const handler = trpcNext.createNextApiHandler({
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router: appRouter,
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createContext,
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});
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// export API handler
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export default async (req: NextApiRequest, res: NextApiResponse) => {
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await handler(req, res);
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};
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export const config = {
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api: {
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bodyParser: false,
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responseLimit: '100mb',
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},
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};

‎src/pages/index.tsx‎

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import Link from 'next/link';
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export default function IndexPage() {
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return (
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<ul>
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<li>
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<Link href="/vanilla">/vanilla</Link>
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</li>
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<li>
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<Link href="/react-hook-form">/react-hook-form</Link>
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</li>
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</ul>
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);
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}

‎src/pages/react-hook-form.tsx‎

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import { zodResolver } from '@hookform/resolvers/zod';
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import { uploadFileSchema } from '~/utils/schemas';
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import { trpc } from '~/utils/trpc';
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import { useRef, useState } from 'react';
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import type { UseFormProps } from 'react-hook-form';
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import { FormProvider, useForm } from 'react-hook-form';
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import type { z } from 'zod';
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/**
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* zod-form-data wraps zod in an effect where the original type is a `FormData`
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*/
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type UnwrapZodEffect<TType extends z.ZodType> = TType extends z.ZodEffects<
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infer U,
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any,
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any
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>
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? U
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: TType;
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type GetInput<TType extends z.ZodType> = UnwrapZodEffect<TType>['_input'];
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function useZodFormData<TSchema extends z.ZodType>(
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props: Omit<UseFormProps<GetInput<TSchema>>, 'resolver'> & {
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schema: TSchema;
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},
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) {
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const formRef = useRef<HTMLFormElement>(null);
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const _resolver = zodResolver(props.schema, undefined, {
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rawValues: true,
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});
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const form = useForm<GetInput<TSchema>>({
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...props,
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resolver: (_, ctx, opts) => {
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if (!formRef.current) {
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return {
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values: {},
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errors: {
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root: {
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message: 'Form not mounted',
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},
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},
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};
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}
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const values = new FormData(formRef.current);
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return _resolver(values, ctx, opts);
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},
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});
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return { ...form, formRef };
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}
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export default function Page() {
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const mutation = trpc.room.sendMessage.useMutation({
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onError(err) {
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alert('Error from server: ' + err.message);
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},
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});
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const form = useZodFormData({
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schema: uploadFileSchema,
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defaultValues: {
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name: 'whadaaaap',
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},
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});
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const [noJs, setNoJs] = useState(false);
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return (
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<>
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<h2 className="text-3xl font-bold">Posts</h2>
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<FormProvider {...form}>
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<form
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method="post"
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action={`/api/trpc/${mutation.trpc.path}`}
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encType="multipart/form-data"
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onSubmit={(_event) => {
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if (noJs) {
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return;
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}
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void form.handleSubmit(async (values, event) => {
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await mutation.mutateAsync(new FormData(event?.target));
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})(_event);
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}}
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style={{ display: 'flex', flexDirection: 'column', gap: 10 }}
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ref={form.formRef}
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>
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<fieldset>
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<legend>Form with file upload</legend>
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<div style={{}}>
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<label htmlFor="name">Enter your name</label>
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<input {...form.register('name')} />
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{form.formState.errors.name && (
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<div>{form.formState.errors.name.message}</div>
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)}
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</div>
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<div>
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<label>Required file, only images</label>
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<input type="file" {...form.register('image')} />
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{form.formState.errors.image && (
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<div>{form.formState.errors.image.message}</div>
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)}
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</div>
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<div>
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<label>Post without JS</label>
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<input
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type="checkbox"
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checked={noJs}
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onChange={(e) => {
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setNoJs(e.target.checked);
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}}
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/>
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</div>
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<div>
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<button type="submit" disabled={mutation.status === 'pending'}>
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submit
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</button>
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</div>
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</fieldset>
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</form>
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{mutation.data && (
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<fieldset>
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<legend>Upload result</legend>
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<ul>
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<li>
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Image: <br />
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<img
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src={mutation.data.image.url}
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alt={mutation.data.image.url}
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/>
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</li>
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</ul>
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</fieldset>
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)}
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</FormProvider>
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</>
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);
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}

‎src/pages/vanilla.tsx‎

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/**
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* This is a Next.js page.
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*/
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import { trpc } from '../utils/trpc';
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export default function IndexPage() {
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const mutation = trpc.room.sendMessage.useMutation({
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onSuccess() {
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alert('success!');
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},
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onError(err) {
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alert('Error: ' + err.message);
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},
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});
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return (
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<>
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{/**
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* The type is defined and can be autocompleted
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* 💡 Tip: Hover over `data` to see the result type
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* 💡 Tip: CMD+Click (or CTRL+Click) on `text` to go to the server definition
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* 💡 Tip: Secondary click on `text` and "Rename Symbol" to rename it both on the client & server
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*/}
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<h1>Form!</h1>
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<fieldset>
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<legend>Form with file upload</legend>
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<form
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method="post"
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action={`/api/trpc/${mutation.trpc.path}`}
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encType="multipart/form-data"
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onSubmit={(e) => {
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const formData = new FormData(e.currentTarget);
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if (formData.get('nojs')) {
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// Submit the form the oldschool way
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return;
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}
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mutation.mutate(formData);
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e.preventDefault();
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}}
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>
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<p>
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<input name="name" defaultValue="haz upload" />
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</p>
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<p>
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<input type="file" name="image" />
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</p>
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<p>
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<input type="checkbox" id="nojs" name="nojs" value="1" />{' '}
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<label htmlFor="nojs">Do oldschool POST w/o JS</label>
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</p>
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<p>
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<button type="submit">submit</button>
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</p>
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</form>
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</fieldset>
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{mutation.data && (
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<fieldset>
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<legend>Upload result</legend>
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<ul>
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<li>
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Image: <br />
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<img
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src={mutation.data.image.url}
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alt={mutation.data.image.url}
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/>
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</li>
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</ul>
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</fieldset>
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)}
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</>
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);
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}

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