improv(parser): export InferOutput from public types entry point

[yashar-new10]

Summary

Exports InferOutput from the public @aws-lambda-powertools/parser/types entry point.

Changes

TypeScript enforces that all types appearing in a function's inferred return type must be nameable via public package exports (see TS2742 / TS2883 — the latter is a variant that also reports the source module path). This check becomes harder to avoid in TypeScript 6 because the compiler is stricter about declaration emit portability.

When using the parser middleware with safeParse: true, the return type of the wrapping function includes InferOutput<TSchema>. Because InferOutput was only exported from the internal path lib/esm/types/parser.js and not from any public entry point, TypeScript 6 could not generate a valid declaration file and raised:

error TS2883: The inferred type of 'X' cannot be named without a reference to
'InferOutput' from '...node_modules/@aws-lambda-powertools/parser/lib/esm/types/parser.js'.
This is likely not portable. A type annotation is necessary.

Consumers hitting this error were forced to add explicit type casts or annotations as a workaround.

Fix

Add InferOutput to the existing re-exports in packages/parser/src/types/index.ts. This is a one-line, type-only change with no runtime impact. Once InferOutput is available at @aws-lambda-powertools/parser/types, TypeScript can reference it in generated .d.ts files automatically and the error is resolved without any changes required on the consumer side.

Testing

Verified locally by:

1. Manually adding InferOutput to the built lib/esm/types/index.d.ts
2. Confirming that TS2883 is resolved without any type annotations or casts in consumer code
3. Confirming that removing the manual edit brings the error back

Issue number: closes #5174

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[boring-cyborg]

Thanks a lot for your first contribution! Please check out our contributing guidelines and don't hesitate to ask whatever you need.
In the meantime, check out the #typescript channel on our Powertools for AWS Lambda Discord: Invite link

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[boring-cyborg]

Awesome work, congrats on your first merged pull request and thank you for helping improve everyone's experience!

[svozza]

Thank you for the fix!