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@effect/openapi-generator@4.0.0 makes Effect 4 stable

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@effect/openapi-generator@4.0.0 makes Effect 4 stable
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// 1h agoOPENSOURCE RELEASE

@effect/openapi-generator@4.0.0 makes Effect 4 stable

ANNOUNCEMENTPRODUCTGITHUB

@effect/openapi-generator@4.0.0 ships with Effect 4.0’s first stable release, standardizing versions across the ecosystem while consolidating HTTP, RPC, SQL, AI, workflow, and CLI capabilities under effect. The generator turns declarative HttpApi contracts into OpenAPI 3.1 documents and typed client outputs.

// ANALYSIS

This is a consequential platform reset disguised as a package release: Effect 4 offers a more coherent TypeScript ecosystem, but the v3 migration is substantial enough to demand deliberate upgrade planning.

  • –Generates OpenAPI 3.1 specifications from typed HttpApi definitions, including schemas, security schemes, annotations, and reusable components
  • –Supports generated `httpclient` and `httpapi` outputs for keeping API contracts and clients aligned
  • –Shared versions and package consolidation reduce dependency drift across Effect projects
  • –The expanded core now covers backend, AI, workflows, databases, RPC, and CLI use cases in one ecosystem
  • –Effect 3 users face meaningful migration work, while unstable APIs may still change in minor releases
// TAGS
effect-openapi-generatoropen-sourceframeworkapicode-generationdevtool

DISCOVERED

1h ago

2026-10-03

PUBLISHED

2d ago

2026-10-01

RELEVANCE

8/ 10