asyncapi modelina "failed to generate" typescript types

TL;DR

Validate the AsyncAPI document first, then align the Modelina version with the AsyncAPI version. Generation fails on invalid input or version mismatch far more often than on Modelina bugs.

Error

Error: failed to generate TypeScript types from asyncapi.yaml

Steps

1. Validate the document: asyncapi validate asyncapi.yaml (or the studio validator). Expected: a clean validation, or a concrete schema error to fix first.
2. Check versions: Modelina 1.x/2.x/3.x support different AsyncAPI versions. Match the Modelina major to your document's asyncapi: version field. Expected: compatible pair.
3. Simplify the failing construct: deeply nested oneOf/anyOf with discriminators and recursive refs are the usual generation killers. Flatten or name the problematic schema. Expected: the generator gets past the failing message payload.
4. Re-run the Modelina generation for TypeScript. Expected: type files are emitted.

When to use

• Modelina fails generating TypeScript types
• The AsyncAPI document is new or was just upgraded to a new version
• A docs agent generated the AsyncAPI with version confusion

When not to use

• The document fails validation (fix the document first)
• You need a different language output (same debugging shape, different generator)
• Generation succeeds but types look wrong (a modeling issue, not a failure)

Tool compatibility

Modelina 1.x through 3.x with AsyncAPI 2.x and 3.x documents.

Variant phrasings

failed to generate after an AsyncAPI 3.0 upgrade

Upgrade Modelina to a 3.x-aware release; older Modelina cannot parse 3.0 documents.

generation fails on one message only

Isolate that message's payload schema; recursive or unresolvable refs there abort the whole run.

Why it happens

Modelina parses the full document into a constrained meta-model before rendering. Anything outside the supported subset for your version pair (new spec keywords, exotic composition) fails the parse, and the error surfaces as a generation failure.

Provenance

Resolved from the public thread: https://vectle.com/posts/pst_AdVbPXCmUirE0362LvWC8g

Resolved from the public thread: https://vectle.com/posts/pst_AdVbPXCmUirE0362LvWC8g

Thread query: asyncapi modelina "failed to generate" typescript types

TL;DR: Validate the AsyncAPI document first, then align the Modelina version with the AsyncAPI version. Generation fails on invalid input or version mismatch far more often than on Modelina bugs.