Cody Posts - Answer Overflow

Cody

•Created by Cody on 3/16/2025 in #help

Server session untyped

We're currently in the process of migrating an AuthJS monorepo to better-auth, but off the bat are experiencing the returned value of a server side getSession being untyped.

const session: {
    [x: string]: any;
}

const session: {
    [x: string]: any;
}

ts: 5.7.3
better-auth: 1.2.4

ts: 5.7.3
better-auth: 1.2.4

We were able to create a minimal reproduction using a fresh Turborepo which we can share if required. Details from minimal repoduction:

import { betterAuth } from "better-auth";

export const auth = betterAuth({});

// returns untyped
const session = await auth.api.getSession({
  headers: new Headers(),
});

// works
export type Session = typeof auth.$Infer.Session;

import { betterAuth } from "better-auth";

export const auth = betterAuth({});

// returns untyped
const session = await auth.api.getSession({
  headers: new Headers(),
});

// works
export type Session = typeof auth.$Infer.Session;

Minimal TS config in order of inheritance.

{
  "extends": "@repo/typescript-config/nextjs.json",
  "compilerOptions": {
    "plugins": [
      {
        "name": "next"
      }
    ]
  },
  "include": [
    "**/*.ts",
    "**/*.tsx",
    "next-env.d.ts",
    "next.config.js",
    ".next/types/**/*.ts"
  ],
  "baseUrl": ".",
  "paths": {
    "~/*": ["./app/*"]
  },
  "exclude": ["node_modules"]
}

{
  "extends": "@repo/typescript-config/nextjs.json",
  "compilerOptions": {
    "plugins": [
      {
        "name": "next"
      }
    ]
  },
  "include": [
    "**/*.ts",
    "**/*.tsx",
    "next-env.d.ts",
    "next.config.js",
    ".next/types/**/*.ts"
  ],
  "baseUrl": ".",
  "paths": {
    "~/*": ["./app/*"]
  },
  "exclude": ["node_modules"]
}

{
  "$schema": "https://json.schemastore.org/tsconfig",
  "extends": "./base.json",
  "compilerOptions": {
    "plugins": [{ "name": "next" }],
    "module": "ESNext",
    "moduleResolution": "Bundler",
    "allowJs": true,
    "jsx": "preserve",
    "noEmit": true
  }
}

{
  "$schema": "https://json.schemastore.org/tsconfig",
  "extends": "./base.json",
  "compilerOptions": {
    "plugins": [{ "name": "next" }],
    "module": "ESNext",
    "moduleResolution": "Bundler",
    "allowJs": true,
    "jsx": "preserve",
    "noEmit": true
  }
}

{
  "$schema": "https://json.schemastore.org/tsconfig",
  "compilerOptions": {
    "esModuleInterop": true,
    "incremental": false,
    "isolatedModules": true,
    "lib": ["es2022", "DOM", "DOM.Iterable"],
    "module": "NodeNext",
    "moduleDetection": "force",
    "moduleResolution": "NodeNext",
    "noUncheckedIndexedAccess": true,
    "resolveJsonModule": true,
    "skipLibCheck": true,
    "strict": true,
    "target": "ES2022"
  }
}

{
  "$schema": "https://json.schemastore.org/tsconfig",
  "compilerOptions": {
    "esModuleInterop": true,
    "incremental": false,
    "isolatedModules": true,
    "lib": ["es2022", "DOM", "DOM.Iterable"],
    "module": "NodeNext",
    "moduleDetection": "force",
    "moduleResolution": "NodeNext",
    "noUncheckedIndexedAccess": true,
    "resolveJsonModule": true,
    "skipLibCheck": true,
    "strict": true,
    "target": "ES2022"
  }
}

9 replies

Gaming

Programming