btravstack · btravers · Jun 29, 2026 · Jun 29, 2026
diff --git a/.changeset/flat-tap-err-is-result.md b/.changeset/flat-tap-err-is-result.md
diff --git a/packages/boxed/CHANGELOG.md b/packages/boxed/CHANGELOG.md
@@ -1,5 +1,12 @@
 # @unthrown/boxed
 
+## 1.1.0
+
+### Patch Changes
+
+- Updated dependencies [6eeb19d]
+  - unthrown@1.1.0
+
 ## 1.0.0
 
 ### Patch Changes

diff --git a/packages/boxed/package.json b/packages/boxed/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@unthrown/boxed",
-  "version": "1.0.0",
+  "version": "1.1.0",
   "description": "Boxed interop for unthrown",
   "keywords": [
     "boxed",

diff --git a/packages/core/CHANGELOG.md b/packages/core/CHANGELOG.md
@@ -1,5 +1,22 @@
 # unthrown
 
+## 1.1.0
+
+### Minor Changes
+
+- 6eeb19d: Add two members, closing the only structural gaps surfaced by comparing the
+  surface against boxed / neverthrow / byethrow:
+  - **`flatTapErr`** (on `Result` and `AsyncResult`) — the error-channel mirror of
+    `flatTap`: runs a `Result`-returning effect on the error, keeps the original
+    error on the effect's success, and threads the effect's error otherwise
+    (`Result<T, E | E2>`). A throw becomes a `Defect`, like every other combinator.
+    Use it for a failable effect _during_ error handling (e.g. writing the error to
+    an audit log that may itself fail).
+  - **`isResult(x)`** — a standalone type guard narrowing an `unknown` to
+    `Result<unknown, unknown>` (and `Result.isResult`). It checks the value carries
+    the `Result` prototype, so a plain `{ tag: "Ok" }` look-alike is not matched;
+    an `AsyncResult` is not a `Result`. For untyped interop boundaries.
+
 ## 1.0.0
 
 ### Major Changes

diff --git a/packages/core/package.json b/packages/core/package.json
@@ -1,6 +1,6 @@
 {
   "name": "unthrown",
-  "version": "1.0.0",
+  "version": "1.1.0",
   "description": "Explicit errors as values, with a separate defect (panic) channel",
   "keywords": [
     "defect",

diff --git a/packages/effect/CHANGELOG.md b/packages/effect/CHANGELOG.md
@@ -1,5 +1,12 @@
 # @unthrown/effect
 
+## 1.1.0
+
+### Patch Changes
+
+- Updated dependencies [6eeb19d]
+  - unthrown@1.1.0
+
 ## 1.0.0
 
 ### Patch Changes

diff --git a/packages/effect/package.json b/packages/effect/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@unthrown/effect",
-  "version": "1.0.0",
+  "version": "1.1.0",
   "description": "Effect interop for unthrown",
   "keywords": [
     "effect",

diff --git a/packages/neverthrow/CHANGELOG.md b/packages/neverthrow/CHANGELOG.md
@@ -1,5 +1,12 @@
 # @unthrown/neverthrow
 
+## 1.1.0
+
+### Patch Changes
+
+- Updated dependencies [6eeb19d]
+  - unthrown@1.1.0
+
 ## 1.0.0
 
 ### Patch Changes

diff --git a/packages/neverthrow/package.json b/packages/neverthrow/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@unthrown/neverthrow",
-  "version": "1.0.0",
+  "version": "1.1.0",
   "description": "neverthrow interop for unthrown",
   "keywords": [
     "errors-as-values",

diff --git a/packages/oxlint/CHANGELOG.md b/packages/oxlint/CHANGELOG.md
@@ -1,5 +1,7 @@
 # @unthrown/oxlint
 
+## 1.1.0
+
 ## 1.0.0
 
 ### Major Changes

diff --git a/packages/oxlint/package.json b/packages/oxlint/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@unthrown/oxlint",
-  "version": "1.0.0",
+  "version": "1.1.0",
   "description": "oxlint plugin enforcing unthrown's conventions",
   "keywords": [
     "errors-as-values",

diff --git a/packages/pattern/CHANGELOG.md b/packages/pattern/CHANGELOG.md
@@ -1,5 +1,12 @@
 # @unthrown/pattern
 
+## 1.1.0
+
+### Patch Changes
+
+- Updated dependencies [6eeb19d]
+  - unthrown@1.1.0
+
 ## 1.0.0
 
 ### Patch Changes

diff --git a/packages/pattern/package.json b/packages/pattern/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@unthrown/pattern",
-  "version": "1.0.0",
+  "version": "1.1.0",
   "description": "ts-pattern integration for unthrown",
   "keywords": [
     "errors-as-values",

diff --git a/packages/standard-schema/CHANGELOG.md b/packages/standard-schema/CHANGELOG.md
@@ -1,5 +1,12 @@
 # @unthrown/standard-schema
 
+## 1.1.0
+
+### Patch Changes
+
+- Updated dependencies [6eeb19d]
+  - unthrown@1.1.0
+
 ## 1.0.0
 
 ### Major Changes

diff --git a/packages/standard-schema/package.json b/packages/standard-schema/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@unthrown/standard-schema",
-  "version": "1.0.0",
+  "version": "1.1.0",
   "description": "Standard Schema (Zod, Valibot, ArkType, …) interop for unthrown",
   "keywords": [
     "arktype",

diff --git a/packages/vitest/CHANGELOG.md b/packages/vitest/CHANGELOG.md
@@ -1,5 +1,12 @@
 # @unthrown/vitest
 
+## 1.1.0
+
+### Patch Changes
+
+- Updated dependencies [6eeb19d]
+  - unthrown@1.1.0
+
 ## 1.0.0
 
 ### Patch Changes

diff --git a/packages/vitest/package.json b/packages/vitest/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@unthrown/vitest",
-  "version": "1.0.0",
+  "version": "1.1.0",
   "description": "Vitest matchers for unthrown",
   "keywords": [
     "errors-as-values",