fix: improve typescript generator

[jonaslagoni]

Note

Medium Risk
Touches TypeScript code generation for primitives/arrays/unions and AJV schema generation/validation, which can change emitted types and runtime behavior (notably date/null handling and union schemas). Risk is mitigated by updated snapshots and added runtime fixtures, but regressions could impact downstream generated clients.

Overview
Improves the TypeScript generator by upgrading @asyncapi/modelina and extending the primitives preset to generate correct marshal/unmarshal for null schemas and date/date-time formatted strings (now producing Date objects on unmarshal).

Tightens array unmarshalling to avoid calling .unmarshal for nested arrays and union aliases, and updates validation generation to (1) accept marshalled JSON strings by JSON.parse-ing input before AJV validation and (2) sanitize root-level union schemas by omitting conflicting type: "object" when oneOf/anyOf is present.

Updates generated test snapshots/runtime outputs accordingly, including new runtime fixtures and scripts for comprehensive payload-type generation/testing, plus minor test comment cleanup.

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[jonaslagoni]

Re: Date unmarshal bug

Acknowledged. This is a valid bug that will require fixes in two places:

1. This repo (cli): The primitives.ts preset handles simple type aliases like FormatDate. The unmarshal needs to wrap date strings with new Date().

2. Modelina repo: The class-based models like PetOrder and AllOfTwoTypes have unmarshal code generated by Modelina. Date conversion needs to be added there.

Tracking this for a follow-up fix that spans both repos.

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[jonaslagoni]

🎉 This PR is included in version 0.64.4 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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