release: 1.5.5

CHANGELOG.md

@@ -5,6 +5,12 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [1.5.5] - 2026-06-02
+
+### Fixed
+
+- **`actionError` swallowed non-`Error` throws** — when an action threw a plain object (e.g. an HTTP error response), `actionError` was set to `undefined` instead of wrapping the value; it now reads `.message` then `.body.message` from the thrown object and wraps the result in a proper `Error`, so callers always receive a usable error or `undefined`
+
 ## [1.5.4] - 2026-06-02
 
 ### Changed

CLAUDE.md

@@ -112,7 +112,7 @@ const { data, execute, state, rollback, rollbackTo, reset, destroy } = createSvS
   - `isDirty: Readable<boolean>` - Whether state has been modified (derived from `isDirtyByField`)
   - `isDirtyByField: Readable<DirtyFields>` - Per-field dirty tracking; keys are dot-notation property paths. When a nested field changes, all parent paths are also marked dirty (e.g., changing `customer.address.street` marks `customer.address` and `customer` as dirty). Cleared on `reset()`, `rollback()`, and successful action (respecting `resetDirtyOnAction`).
   - `actionInProgress: Readable<boolean>` - Action execution status
-  - `actionError: Readable<Error | undefined>` - Last action error
+  - `actionError: Readable<Error | undefined>` - Last action error; non-`Error` thrown objects are wrapped by reading `.message` then `.body.message` before falling back to `String()`
   - `snapshots: Readable<Snapshot<T>[]>` - Snapshot history for undo
   - `asyncErrors: Readable<AsyncErrors>` - Async validation errors (keyed by property path)
   - `hasAsyncErrors: Readable<boolean>` - Whether any async validation errors exist

demo/package.json

@@ -19,30 +19,30 @@
 		"all": "node --run format:fix && node --run lint:fix && node --run ts:check && node --run build"
 	},
 	"devDependencies": {
-		"@sveltejs/vite-plugin-svelte": "^7.0.0",
-		"@tailwindcss/postcss": "^4.2.2",
-		"@tailwindcss/vite": "^4.2.2",
+		"@sveltejs/vite-plugin-svelte": "^7.1.2",
+		"@tailwindcss/postcss": "^4.3.0",
+		"@tailwindcss/vite": "^4.3.0",
 		"@tsconfig/svelte": "^5.0.8",
-		"@typescript-eslint/eslint-plugin": "^8.58.0",
-		"@typescript-eslint/parser": "^8.58.0",
-		"eslint": "^10.1.0",
+		"@typescript-eslint/eslint-plugin": "^8.60.1",
+		"@typescript-eslint/parser": "^8.60.1",
+		"eslint": "^10.4.1",
 		"eslint-config-prettier": "^10.1.8",
-		"eslint-plugin-simple-import-sort": "^12.1.1",
-		"eslint-plugin-svelte": "^3.16.0",
+		"eslint-plugin-simple-import-sort": "^13.0.0",
+		"eslint-plugin-svelte": "^3.19.0",
 		"eslint-plugin-unicorn": "^64.0.0",
-		"postcss": "^8.5.8",
-		"prettier": "^3.8.1",
-		"prettier-plugin-svelte": "^3.5.1",
-		"svelte-check": "^4.4.6",
-		"svelte-eslint-parser": "^1.6.0",
-		"svelte-preprocess": "^6.0.3",
-		"tailwindcss": "^4.2.2",
+		"postcss": "^8.5.15",
+		"prettier": "^3.8.3",
+		"prettier-plugin-svelte": "^4.1.0",
+		"svelte-check": "^4.5.0",
+		"svelte-eslint-parser": "^1.7.1",
+		"svelte-preprocess": "^6.0.5",
+		"tailwindcss": "^4.3.0",
 		"tslib": "^2.8.1",
-		"typescript": "^5.9.3",
-		"vite": "^8.0.3"
+		"typescript": "^6.0.3",
+		"vite": "^8.0.16"
 	},
 	"dependencies": {
-		"svelte": "^5.55.1",
-		"zod": "^4.3.6"
+		"svelte": "^5.56.1",
+		"zod": "^4.4.3"
 	}
 }

demo/src/app.d.ts

@@ -1,3 +1,8 @@
+declare module '*.postcss' {
+	const content: string;
+	export default content;
+}
+
 declare global {
 	namespace App {
 		// interface Error {}

docs/index.html

@@ -5,8 +5,8 @@
 		<link rel="icon" href="favicon.png" />
 		<title>svstate demo</title>
 		<meta name="viewport" content="width=device-width, initial-scale=1" />
-		<script type="module" crossorigin src="/svstate/assets/index-CXrV2wig.js"></script>
-		<link rel="stylesheet" crossorigin href="/svstate/assets/index-Ck8pee3s.css">
+		<script type="module" crossorigin src="/svstate/assets/index-BxuovIe5.js"></script>
+		<link rel="stylesheet" crossorigin href="/svstate/assets/index-GOI4QFiT.css">
 	</head>
 
 	<body>

package.json

@@ -1,6 +1,6 @@
 {
   "name": "svstate",
-  "version": "1.5.4",
+  "version": "1.5.5",
   "description": "Supercharged $state() for Svelte 5: deep reactive proxy with validation, cross-field rules, computed & side-effects",
   "author": "BCsabaEngine",
   "license": "ISC",

src/state.svelte.ts

@@ -406,7 +406,20 @@ export function createSvState<T extends Record<string, unknown>, V extends Valid
       callPlugins('onAction', { phase: 'after', params: parameters });
     } catch (caughtError) {
       await actuators?.actionCompleted?.(caughtError);
-      const actionError_ = caughtError instanceof Error ? caughtError : undefined;
+      const actionError_ =
+        caughtError instanceof Error
+          ? caughtError
+          : caughtError && typeof caughtError === 'object'
+            ? new Error(
+                String(
+                  // eslint-disable-next-line @typescript-eslint/no-explicit-any
+                  (caughtError as any).message ??
+                    // eslint-disable-next-line @typescript-eslint/no-explicit-any
+                    (caughtError as any).body?.message ??
+                    caughtError
+                )
+              )
+            : undefined;
       actionError.set(actionError_);
       callPlugins('onAction', { phase: 'after', params: parameters, error: actionError_ });
     } finally {