Inferring types on the server

Is it also possible to infer the return-types of specific API routes on the server?

I am creating a better-auth wrapper using effect-ts for my application and am missing some type-safety on the server.

serverClient.$Infer

serverClient.$Infer

serverClient.$Infer

serverClient.$Infer

gives the following type

(property) $Infer: {
    Session: {
        session: {};
        user: {};
    };
}

(property) $Infer: {
    Session: {
        session: {};
        user: {};
    };
}

(property) $Infer: {
    Session: {
        session: {};
        user: {};
    };
}

(property) $Infer: {
    Session: {
        session: {};
        user: {};
    };
}

SemaelseOP•7/11/25, 1:18 PM

betterAuth({
    appName: "Multa",
    database: drizzleAdapter(database._drizzle, {
      provider: "pg",
      schema: schema,
    }),
    trustedOrigins: ["http://localhost:8002"],
    socialProviders: {
      github: {
        clientId: Redacted.value(yield* Config.redacted("GITHUB_CLIENT_ID")),
        clientSecret: Redacted.value(
          yield* Config.redacted("GITHUB_CLIENT_SECRET"),
        ),
      },
    },
    advanced: {
      database: {
        generateId: false,
      },
      cookiePrefix: "multa",
    },
    account: {
      modelName: "accountsTable",
    },
    user: {
      modelName: "usersTable",
    },
    session: {
      modelName: "sessionsTable",
      cookieCache: {
        enabled: true,
        maxAge: 5 * 60,
      },
    },
    verification: {
      modelName: "verificationsTable",
    },
    plugins: [],
  });

betterAuth({
    appName: "Multa",
    database: drizzleAdapter(database._drizzle, {
      provider: "pg",
      schema: schema,
    }),
    trustedOrigins: ["http://localhost:8002"],
    socialProviders: {
      github: {
        clientId: Redacted.value(yield* Config.redacted("GITHUB_CLIENT_ID")),
        clientSecret: Redacted.value(
          yield* Config.redacted("GITHUB_CLIENT_SECRET"),
        ),
      },
    },
    advanced: {
      database: {
        generateId: false,
      },
      cookiePrefix: "multa",
    },
    account: {
      modelName: "accountsTable",
    },
    user: {
      modelName: "usersTable",
    },
    session: {
      modelName: "sessionsTable",
      cookieCache: {
        enabled: true,
        maxAge: 5 * 60,
      },
    },
    verification: {
      modelName: "verificationsTable",
    },
    plugins: [],
  });

^ This is my config if that matters

SemaelseOP•7/11/25, 1:36 PM

Okay, I think this might actually be a bug. Removing the plugin key (with an empty array as value) seems to fix the issue.

betterAuth({ appName: "Multa", database: drizzleAdapter(database._drizzle, { provider: "pg", schema: schema, }), trustedOrigins: ["http://localhost:8002"], socialProviders: { github: { clientId: Redacted.value(yield* Config.redacted("GITHUB_CLIENT_ID")), clientSecret: Redacted.value( yield* Config.redacted("GITHUB_CLIENT_SECRET"), ), }, }, advanced: { database: { generateId: false, }, cookiePrefix: "multa", }, account: { modelName: "accountsTable", }, user: { modelName: "usersTable", }, session: { modelName: "sessionsTable", cookieCache: { enabled: true, maxAge: 5 * 60, }, }, verification: { modelName: "verificationsTable", }, plugins: [], });

Inferring types on the server

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