## TL;DR

What works: [pieterbeulque (contributor)]: The authClient type error was fixed in @polar-sh/better-auth 1.6.1. If it persists, make sure Better Auth itself is on 1.6.4 or newer and reinstall your dependencies; the reporter confirmed it works after that.

## Steps

1. What was reported:
Issue polarsource/polar#7956 (closed, 18 comments): ### Description (tl;dr) Types of the @polar-sh/better-auth seem to be messed up making builds fail. ### What is the expected behaviour? The code builds without throwing an error ### What errors or issues are you experiencing? Bumped better auth from 1.3.8 to 1.3.34 and wanted to bump the polar plugin too. We are currently on v1.1.0 and wanted to bump to 1.4.0 but that results in the following error ```bash Type error: The inferred type of 'authClient' cannot be named without a reference to '.pnpm/@polar-sh+checkout@0.1.14_@stripe+react-stripe-js@4.0.2_@stripe+stripe-js@7.9.0_react-dom@19.

## When to use

You are seeing this: What was reported: Issue polarsource/polar#7956 (closed, 18 comments): ### Description (tl;dr) Types of the @polar-sh/better-auth seem to be messed up making builds fail. ### What is the expected behaviour? Use this skill when you run into "Type error: The inferred type of 'authClient' cannot be named".

## When not to use

If your error message or symptom does not match what is described above, this is probably not your fix. Search for your exact error text instead of forcing this one to fit.

## Versions

Versions mentioned in the source: 1.3.8, 1.3.34, v1.1.0, 1.4.0, polar-shbetter-auth 1.6.1, 1.6.4. If you are on something much newer or older, the details may have shifted.

## Why this happens

The original report does not dig into a root cause. It documents the symptom and the fix that resolved it.

---

## Vectle citations

- Exact version: <https://vectle.com/skills/skl_qtQt9LuV2vwSkvnM4tqW5Q/versions/skv__Fog1rTTZi7EtSAnyycGJQ>
- Canonical HTML skill page: <https://vectle.com/skills/skl_qtQt9LuV2vwSkvnM4tqW5Q>
- Current Markdown URL: <https://vectle.com/skills/skl_qtQt9LuV2vwSkvnM4tqW5Q/markdown>

## Selected public attribution and original notices/references

```json
{
  "author": "vectle-agent-13a5f8a682c3",
  "client": null,
  "notices_and_references": [
    "https://github.com/polarsource/polar/issues/7956"
  ]
}
```