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[PR #5778] fix: string[] inference for additionalFields #14465

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opened 2026-04-13 09:29:19 -05:00 by GiteaMirror · 0 comments
GiteaMirror commented 2026-04-13 09:29:19 -05:00
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Original Pull Request: https://github.com/better-auth/better-auth/pull/5778

State: closed
Merged: Yes

Closes #5774

Description

This PR fixes a bug where additionalFields with type: 'string[]' were incorrectly inferred as number[] on the client. This caused TypeScript errors when using array methods like .includes().

The root cause was a variable shadowing bug in the InferValueType generic.

Changes

  1. packages/better-auth/src/db/field.ts:
    • Renamed the inner inferred type in InferValueType from T to U to resolve the shadowing.
    • Added a more precise Record<string, any> type for the json type.
  2. packages/better-auth/src/plugins/additional-fields/additional-fields.test.ts:
    • Added a new test case that specifically replicates the bug from #5774 (using input: false).
    • The test asserts that the inferred type is string[] and, more importantly, that the .includes() method correctly accepts a string parameter.

Summary by cubic

Fixes incorrect type inference for additionalFields with type "string[]" that returned number[] on the client, causing TypeScript errors (e.g., .includes). Updates InferValueType to correctly handle "string[]" and "json".

  • Bug Fixes
    • Prevented generic shadowing in InferValueType by renaming the inferred type (T → U) for ${infer U}[].
    • Correctly infers string[] for "string[]" and number[] for other arrays; adds Record<string, any> for "json".

Written for commit 2f0d36310d. Summary will update automatically on new commits.

**Original Pull Request:** https://github.com/better-auth/better-auth/pull/5778 **State:** closed **Merged:** Yes --- Closes #5774 ## Description This PR fixes a bug where `additionalFields` with `type: 'string[]'` were incorrectly inferred as `number[]` on the client. This caused TypeScript errors when using array methods like `.includes()`. The root cause was a **variable shadowing** bug in the `InferValueType` generic. ## Changes 1. **`packages/better-auth/src/db/field.ts`**: * Renamed the inner inferred type in `InferValueType` from `T` to `U` to resolve the shadowing. * Added a more precise `Record<string, any>` type for the `json` type. 2. **`packages/better-auth/src/plugins/additional-fields/additional-fields.test.ts`**: * Added a new test case that specifically replicates the bug from #5774 (using `input: false`). * The test asserts that the inferred type is `string[]` and, more importantly, that the `.includes()` method correctly accepts a `string` parameter. <!-- This is an auto-generated description by cubic. --> --- ## Summary by cubic Fixes incorrect type inference for additionalFields with type "string[]" that returned number[] on the client, causing TypeScript errors (e.g., .includes). Updates InferValueType to correctly handle "string[]" and "json". - **Bug Fixes** - Prevented generic shadowing in InferValueType by renaming the inferred type (T → U) for `${infer U}[]`. - Correctly infers string[] for "string[]" and number[] for other arrays; adds Record<string, any> for "json". <sup>Written for commit 2f0d36310d3cdbd23b911f591f79a56ee6cd32c0. Summary will update automatically on new commits.</sup> <!-- End of auto-generated description by cubic. -->
GiteaMirror added the pull-request label 2026-04-13 09:29:19 -05:00
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Reference: github-starred/better-auth#14465