chore: cleanup and lint fix

plugins/airi-plugin-web-extension/package.json

@@ -18,6 +18,7 @@
     "@iconify-json/solar": "catalog:",
     "@iconify-json/svg-spinners": "catalog:",
     "@moeru/eventa": "catalog:",
+    "@moeru/std": "catalog:",
     "@proj-airi/server-sdk": "workspace:^",
     "@proj-airi/ui": "workspace:^",
     "@unocss/reset": "catalog:",

plugins/airi-plugin-web-extension/src/background/client.ts

@@ -7,6 +7,8 @@ import { nanoid } from 'nanoid'
 
 import packageJSON from '../../package.json'
 
+import { errorMessageFromValue } from '../utils/error-message'
+
 const PLUGIN_NAME = 'proj-airi:plugin-web-extension'
 
 export interface ClientState {
@@ -72,7 +74,7 @@ export async function ensureClient(state: ClientState, settings: ExtensionSettin
     autoReconnect: true,
     onError: (error) => {
       state.connected = false
-      state.lastError = error instanceof Error ? error.message : String(error)
+      state.lastError = errorMessageFromValue(error)
     },
     onClose: () => {
       state.connected = false
@@ -88,7 +90,7 @@ export async function ensureClient(state: ClientState, settings: ExtensionSettin
   }
   catch (error) {
     state.connected = false
-    state.lastError = error instanceof Error ? error.message : String(error)
+    state.lastError = errorMessageFromValue(error)
   }
 }
 

plugins/airi-plugin-web-extension/src/utils/error-message.ts

@@ -0,0 +1,17 @@
+import { errorMessageFrom } from '@moeru/std'
+
+/**
+ * Returns an error message while preserving JavaScript string fallback.
+ *
+ * Use when:
+ * - Web extension state needs a message for arbitrary thrown values.
+ *
+ * Expects:
+ * - `error` may be any thrown value.
+ *
+ * Returns:
+ * - The extracted error message, else `String(error)`.
+ */
+export function errorMessageFromValue(error: unknown): string {
+  return errorMessageFrom(error) ?? String(error)
+}