Headers

// @filename: server.ts
import { initTRPC } from '@trpc/server';
const t = initTRPC.create();
export const appRouter = t.router({});
export type AppRouter = typeof appRouter;

// @filename: client.ts
// ---cut---
import { createTRPCClient, httpBatchLink } from '@trpc/client';
import type { AppRouter } from './server';

let token: string;

export function setToken(newToken: string) {
  /**
   * You can also save the token to cookies, and initialize from
   * cookies above.
   */
  token = newToken;
}

export const trpc = createTRPCClient<AppRouter>({
  links: [
    httpBatchLink({
      url: 'http://localhost:3000',
      /**
       * Headers will be called on each request.
       */
      headers() {
        return {
          Authorization: token,
        };
      },
    }),
  ],
});

// @target: esnext
// @filename: server.ts
import { initTRPC } from '@trpc/server';
import { z } from 'zod';
const t = initTRPC.create();
export const appRouter = t.router({
  auth: t.router({
    login: t.procedure
      .input(z.object({ username: z.string(), password: z.string() }))
      .mutation(() => ({ accessToken: 'token' })),
  }),
});
export type AppRouter = typeof appRouter;

// @filename: utils.ts
export function setToken(token: string) {}

// @filename: auth.ts
import { createTRPCClient, httpBatchLink } from '@trpc/client';
import type { AppRouter } from './server';
const trpc = createTRPCClient<AppRouter>({ links: [httpBatchLink({ url: 'http://localhost:3000' })] });
import { setToken } from './utils';
// ---cut---
const result = await trpc.auth.login.mutate({ username: 'user', password: 'pass' });
setToken(result.accessToken);