Are you able to use better auth plugins ?

[AFAskar]

when using plugins in betterauth it breaks trpc , here are the errors i got

The inferred type of 'appRouter' cannot be named without a reference to '../../auth/node_modules/better-auth/dist/shared/better-auth.B955zZIT'. This is likely not portable. A type annotation is necessary.

Exported variable 'appRouter' has or is using name 'OAuthProxyOptions' from external module "~/Desktop/Git-Projects/PROJECT/node_modules/.pnpm/better-auth@1.3.27_next@15.5.4_@babel+core@7.28.4_@opentelemetry+api@1.9.0_babel-plugin_980c5e2cfd658cc38be409e61a8bed76/node_modules/better-auth/dist/plugins/oauth-proxy/index" but cannot be named.

The inferred type of this node exceeds the maximum length the compiler will serialize. An explicit type annotation is needed.

just the t3 turbo plugins cause this error

Exported variable 'appRouter' has or is using name 'OAuthProxyOptions' from external module "~/Desktop/Git-Projects/PROJECT/node_modules/.pnpm/better-auth@1.3.27_next@15.5.4_@babel+core@7.28.4_@opentelemetry+api@1.9.0_babel-plugin_980c5e2cfd658cc38be409e61a8bed76/node_modules/better-auth/dist/plugins/oauth-proxy/index" but cannot be named.

and removing the user schema additions removes the error

    user: {
      additionalFields: {
        phoneNumber: {
          type: "string",
          required: true,
          input: true,
        },
        lang: {
          type: "string",
          required: false,
          defaultValue: "ar",
        },
        loyaltyPoints: {
          type: "number",
          required: false,
        },
        address: {
          type: "string",
          required: false,
        },
      },
    },

here is my better auth config

import type { BetterAuthOptions } from "better-auth";
import { expo } from "@better-auth/expo";
import { betterAuth } from "better-auth";
import { drizzleAdapter } from "better-auth/adapters/drizzle";
import {
  admin,
  oAuthProxy,
  organization,
  twoFactor,
} from "better-auth/plugins";

import { db } from "@acme/db/client";

export function initAuth(options: {
  baseUrl: string;
  productionUrl: string;
  secret: string | undefined;

  appleClientId: string;
  appleClientSecret: string;
  appleBundleId: string;

  googleClientId: string;
  googleClientSecret: string;
}) {
  const config = {
    database: drizzleAdapter(db, {
      provider: "pg",
    }),
    baseURL: options.baseUrl,
    secret: options.secret,
    plugins: [
      oAuthProxy({
        /**
         * Auto-inference blocked by https://github.com/better-auth/better-auth/pull/2891
         */
        currentURL: options.baseUrl,
        productionURL: options.productionUrl,
      }),
      expo(),
      twoFactor(),
      organization({
        schema: {
          organization: {
            additionalFields: {
              nameEn: {
                type: "string",
                required: true,
              },
              address: {
                type: "string",
                required: true,
              },
              location: {
                type: "string",
                required: true,
              },
              phoneNumber: {
                type: "string",
                required: true,
              },
              VAT: {
                type: "string",
                required: true,
              },
              IBAN: {
                type: "string",
                required: true,
              },
              district: {
                type: "string",
                required: true,
              },
              paperCommission: {
                type: "number",
                required: false,
                defaultValue: 0,
              },
              productCommission: {
                type: "number",
                required: false,
                defaultValue: 0,
              },
            },
          },
        },
      }),
      admin(),
    ],
    socialProviders: {
      apple: {
        clientId: options.appleClientId,
        clientSecret: options.appleClientSecret,
        appBundleIdentifier: options.appleBundleId,
      },
      google: {
        clientId: options.googleClientId,
        clientSecret: options.googleClientSecret,
      },
    },
    emailAndPassword: {
      enabled: true,
    },
    user: {
      additionalFields: {
        phoneNumber: {
          type: "string",
          required: true,
          input: true,
        },
        lang: {
          type: "string",
          required: false,
          defaultValue: "ar",
        },
        loyaltyPoints: {
          type: "number",
          required: false,
        },
        address: {
          type: "string",
          required: false,
        },
      },
    },
    trustedOrigins: ["expo://", "https://appleid.apple.com"],
  } satisfies BetterAuthOptions;

  return betterAuth(config);
}

export type Auth = ReturnType<typeof initAuth>;
export type Session = Auth["$Infer"]["Session"];

here is what is needed to fix the errors

import type { BetterAuthOptions } from "better-auth";
import { expo } from "@better-auth/expo";
import { betterAuth } from "better-auth";
import { drizzleAdapter } from "better-auth/adapters/drizzle";
import {
  oAuthProxy,
} from "better-auth/plugins";

import { db } from "@acme/db/client";

export function initAuth(options: {
  baseUrl: string;
  productionUrl: string;
  secret: string | undefined;

  appleClientId: string;
  appleClientSecret: string;
  appleBundleId: string;

  googleClientId: string;
  googleClientSecret: string;
}) {
  const config = {
    database: drizzleAdapter(db, {
      provider: "pg",
    }),
    baseURL: options.baseUrl,
    secret: options.secret,
    plugins: [
      oAuthProxy({
        /**
         * Auto-inference blocked by https://github.com/better-auth/better-auth/pull/2891
         */
        currentURL: options.baseUrl,
        productionURL: options.productionUrl,
      }),
      expo(),
    ],
    socialProviders: {
      apple: {
        clientId: options.appleClientId,
        clientSecret: options.appleClientSecret,
        appBundleIdentifier: options.appleBundleId,
      },
      google: {
        clientId: options.googleClientId,
        clientSecret: options.googleClientSecret,
      },
    },
    emailAndPassword: {
      enabled: true,
    },
    trustedOrigins: ["expo://", "https://appleid.apple.com"],
  } satisfies BetterAuthOptions;

  return betterAuth(config);
}

export type Auth = ReturnType<typeof initAuth>;
export type Session = Auth["$Infer"]["Session"];

how can i fix these issues without a loss of functionality

[AFAskar]

the max length has been fixed i think because of options.extraPlugins but the rest of the issues persist

[AFAskar]

commenting out the authapi from createTRPCContext's return statement fixes all the type errors but may have some unforseen consequence

[wallaceosmar]

You only need to add the type

export interface TRPCContextReturn {
  authApi: Auth["api"];
  session: Awaited<ReturnType<Auth["api"]["getSession"]>>;
  db: typeof db;
}
export const createTRPCContext = async (opts: {
  headers: Headers;
  auth: Auth;
}): Promise<TRPCContextReturn> => {
  const authApi = opts.auth.api;
  const session = await authApi.getSession({
    headers: opts.headers,
  });
  return {
    authApi,
    session,
    db,
  };
};