fix: improve typescript generator

[jonaslagoni]

Note

Medium Risk
Touches core TypeScript codegen for serialization and validation, which can change generated types/behavior (notably Date handling and union schema shape) across many outputs.

Overview
Improves TypeScript generator output by adding explicit support for null and date/date-time formats in primitive marshalling/unmarshalling (including converting date strings to Date on unmarshal) and tightening array unmarshal so it doesn’t call .unmarshal() on nested arrays or union aliases.

Updates generated AJV validate helpers to accept marshalled JSON strings (auto-JSON.parse) and adjusts schema serialization to drop a conflicting root type: "object" on oneOf/anyOf unions, which changes generated snapshots.

Bumps @asyncapi/modelina to 6.0.0-next.10 and adds a new runtime test fixture + generation target for comprehensive AsyncAPI payload type coverage (new test:payload-types / generate:payload-types).

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Project	Deployment	Actions	Updated (UTC)
the-codegen-project	Ready	Preview, Comment	Feb 23, 2026 7:14pm
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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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Cursor Bugbot has reviewed your changes and found 4 potential issues.

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[cursor]

FormatTime incorrectly modeled as Date

High Severity

FormatTime is generated as type FormatTime = Date, but unmarshal returns JSON.parse(json) (a string) and marshal relies on JSON.stringify of a Date. This creates a runtime/typing mismatch and breaks the stated intent that RFC3339 time values remain strings.

 

[cursor]

Null payload type alias is wrong

Medium Severity

NullPlain is generated as type NullPlain = any, while the module’s unmarshal returns null and marshal only accepts null. This makes the exported type inconsistent with the actual API and can let invalid values type-check even though marshal can’t accept them.