Alt: Improving final intersection

[RobinTail]

Fixes #2760 Alternative implementation to #2761

I like this one more for being more explicit.

[coderabbitai[bot]]

Walkthrough

The changes update core type definitions to allow input schemas to be undefined in the EndpointsFactory and related utilities. A new ConditionalIntersection type replaces direct intersection types to handle optional schemas. Type constraints, return types, and method signatures are adjusted accordingly. Tests are enhanced to verify stricter type equality and input property handling.

Changes

File(s)	Change Summary
express-zod-api/src/endpoints-factory.ts	Allowed undefined for generic input schema parameters; replaced z.ZodIntersection with ConditionalIntersection in types and methods.
express-zod-api/src/io-schema.ts	Added ConditionalIntersection type alias; updated getFinalEndpointInputSchema to use it and accept undefined generics.
express-zod-api/tests/endpoints-factory.spec.ts	Added tests for excessive property handling; changed type assertions from toExtend to toEqualTypeOf; updated generic parameter assertions.

Sequence Diagram(s)

sequenceDiagram
    participant Developer
    participant EndpointsFactory
    participant Handler

    Developer->>EndpointsFactory: build({ input: schema | undefined, ... })
    EndpointsFactory->>Handler: handler({ input: ConditionalIntersection<MIN, IN> })
    Handler-->>EndpointsFactory: Returns output

Assessment against linked issues

Objective	Addressed	Explanation
Ensure accessing undefined input properties results in a TypeScript error, not never type (#2760)	✅

Poem

In the warren of types, a fix hops in—
Undefined inputs now handled with a grin!
No more “never” when you typo a key,
TypeScript will bark, as clear as can be.
With intersections smart and schemas anew,
Bugs in the garden are fewer—woohoo!
🐇✨

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📒 Files selected for processing (1)

• CHANGELOG.md (1 hunks)

🚧 Files skipped from review as they are similar to previous changes (1)

• CHANGELOG.md

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[coveralls-official[bot]]

coverage: 100.0%. remained the same when pulling 9c7f45fa69cc892c603d251d7387e8dfb1ab719d on alt-2760-opt-schema into d2736baa51a6143d6b890be694f65021f2150c9a on master.