btravstack · btravers · Jun 27, 2026 · Jun 27, 2026
diff --git a/.changeset/declare-node-engines.md b/.changeset/declare-node-engines.md
diff --git a/.changeset/unthrown-migration.md b/.changeset/unthrown-migration.md
diff --git a/.changeset/update-org-urls.md b/.changeset/update-org-urls.md
diff --git a/packages/asyncapi/CHANGELOG.md b/packages/asyncapi/CHANGELOG.md
@@ -1,5 +1,17 @@
 # @amqp-contract/asyncapi
 
+## 1.0.0
+
+### Minor Changes
+
+- 4d574c6: Declare `engines.node: ">=22.19"` on all publishable packages. `undici@8.4.1` (transitively required via `@amqp-contract/testing` → `testcontainers`) requires Node `>=22.19.0`; consumers now see this constraint at install time instead of silently inheriting it.
+
+### Patch Changes
+
+- Updated dependencies [d5fec7e]
+- Updated dependencies [4ed4abe]
+  - @amqp-contract/contract@1.0.0
+
 ## 0.25.0
 
 ### Minor Changes

diff --git a/packages/asyncapi/package.json b/packages/asyncapi/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@amqp-contract/asyncapi",
-  "version": "0.25.0",
+  "version": "1.0.0",
   "description": "AsyncAPI specification generator for amqp-contract",
   "keywords": [
     "amqp",

diff --git a/packages/client/CHANGELOG.md b/packages/client/CHANGELOG.md
@@ -1,5 +1,14 @@
 # @amqp-contract/client
 
+## 1.0.0
+
+### Patch Changes
+
+- Updated dependencies [d5fec7e]
+- Updated dependencies [4ed4abe]
+  - @amqp-contract/contract@1.0.0
+  - @amqp-contract/core@1.0.0
+
 ## 0.25.0
 
 ### Minor Changes

diff --git a/packages/client/package.json b/packages/client/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@amqp-contract/client",
-  "version": "0.25.0",
+  "version": "1.0.0",
   "description": "Client utilities for publishing messages using amqp-contract",
   "keywords": [
     "amqp",

diff --git a/packages/contract/CHANGELOG.md b/packages/contract/CHANGELOG.md
@@ -1,5 +1,28 @@
 # @amqp-contract/contract
 
+## 1.0.0
+
+### Major Changes
+
+- d5fec7e: **BREAKING:** Replace the `neverthrow` dependency with [`unthrown`](https://github.com/btravstack/unthrown) for value-based error handling across all packages.
+
+  `unthrown` keeps the errors-as-values model but adds a third **`Defect`** channel for unexpected failures, and renames/reshapes several APIs. If you consume the `Result` / `AsyncResult` values returned by the client, worker, and core, you will need to update your call sites.
+
+  ### What changed
+  - **`ResultAsync` → `AsyncResult`.** All async-returning methods (`publish`, `call`, `create`, `close`, handler return types, …) now return `unthrown`'s `AsyncResult<T, E>`.
+  - **`.match()` is now boxed and has three channels.** `result.match(okFn, errFn)` → `result.match({ ok, err, defect })`. The extra `defect` branch handles unexpected throws.
+  - **`.andThen` → `.flatMap`**, **`.andTee` → `.tap`**, **`.orTee` → `.tapErr`** (`.map`, `.mapErr`, `.orElse` are unchanged).
+  - **No `okAsync` / `errAsync`.** Build async results with `ok(value).toAsync()` / `err(error).toAsync()`.
+  - **No static `ResultAsync.fromPromise` / `Result.fromThrowable`.** Use the free functions `fromPromise(promise, qualify)`, `fromSafePromise(promise)`, and `fromThrowable(fn, qualify)`. The `qualify` mapper returns `E | Defect`.
+  - **`._unsafeUnwrap()` → `.unwrap()`**, **`._unsafeUnwrapErr()` → `.unwrapErr()`** (these now throw `UnwrapError` on the wrong variant, and re-throw the original cause on a `Defect`).
+  - **`.isOk()` / `.isErr()` / `.isDefect()` narrow** like neverthrow's did (they guard `this`); standalone `isOk(result)` / `isErr(result)` / `isDefect(result)` functions are also available.
+  - **Error classes are now `TaggedError`s.** `TechnicalError`, `MessageValidationError`, `RetryableError`, `NonRetryableError`, `RpcTimeoutError`, and `RpcCancelledError` each carry a `_tag` for exhaustive dispatch via `matchTags`. The tags are **namespaced** — `"@amqp-contract/TechnicalError"`, `"@amqp-contract/RetryableError"`, etc. — so they don't collide with other libraries' tags in a shared `matchTags`. The human-facing `Error.name` is kept bare (`"TechnicalError"`, `"RetryableError"`, …), so stack traces and `.name` checks are unaffected. Their positional constructors are unchanged.
+  - **`HandlerError` is now a tagged-union type, not an abstract class.** It is `RetryableError | NonRetryableError`. Replace `error instanceof HandlerError` with `isHandlerError(error)`.
+
+### Patch Changes
+
+- 4ed4abe: Update repository, homepage, and bug-tracker URLs after the project moved from the `btravers` GitHub profile to the `btravstack` organization. Documentation now lives at https://btravstack.github.io/amqp-contract/.
+
 ## 0.25.0
 
 ### Minor Changes

diff --git a/packages/contract/package.json b/packages/contract/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@amqp-contract/contract",
-  "version": "0.25.0",
+  "version": "1.0.0",
   "description": "Contract builder for amqp-contract",
   "keywords": [
     "amqp",

diff --git a/packages/core/CHANGELOG.md b/packages/core/CHANGELOG.md
@@ -1,5 +1,13 @@
 # @amqp-contract/core
 
+## 1.0.0
+
+### Patch Changes
+
+- Updated dependencies [d5fec7e]
+- Updated dependencies [4ed4abe]
+  - @amqp-contract/contract@1.0.0
+
 ## 0.25.0
 
 ### Minor Changes

diff --git a/packages/core/package.json b/packages/core/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@amqp-contract/core",
-  "version": "0.25.0",
+  "version": "1.0.0",
   "description": "Core utilities for AMQP setup and management in amqp-contract",
   "keywords": [
     "amqp",

diff --git a/packages/testing/CHANGELOG.md b/packages/testing/CHANGELOG.md
@@ -1,5 +1,7 @@
 # @amqp-contract/testing
 
+## 1.0.0
+
 ## 0.25.0
 
 ### Minor Changes

diff --git a/packages/testing/package.json b/packages/testing/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@amqp-contract/testing",
-  "version": "0.25.0",
+  "version": "1.0.0",
   "description": "Testing utilities for AMQP contracts with testcontainers",
   "keywords": [
     "amqp",

diff --git a/packages/worker/CHANGELOG.md b/packages/worker/CHANGELOG.md
@@ -1,5 +1,14 @@
 # @amqp-contract/worker
 
+## 1.0.0
+
+### Patch Changes
+
+- Updated dependencies [d5fec7e]
+- Updated dependencies [4ed4abe]
+  - @amqp-contract/contract@1.0.0
+  - @amqp-contract/core@1.0.0
+
 ## 0.25.0
 
 ### Minor Changes

diff --git a/packages/worker/package.json b/packages/worker/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@amqp-contract/worker",
-  "version": "0.25.0",
+  "version": "1.0.0",
   "description": "Worker utilities for consuming messages using amqp-contract",
   "keywords": [
     "amqp",