Add error boundaries and a default one with notifications.

demo/DemoApp.tsx

@@ -36,6 +36,8 @@ import {useNotify} from "../src/Components/Notifications/Notifications";
 import {Notification, NotificationType} from "../src/Components/Notifications/Notification";
 import {Box} from "../src/Components/Box";
 import {Await, useAsync} from "../src/Async";
+import {NotifyErrorsBoundary} from "../src/Components/Errors/NotifyErrorsBoundary";
+import {DemoFailingComponent, DemoResetComponent} from "./DemoFailingComponent";
 
 export function DemoApp()
 {
@@ -68,6 +70,8 @@ export function DemoApp()
 		}, 2000);
 	}), [asyncChange]);
 
+	const [failingComponentsCount, setFailingComponentsCount] = useState(0);
+
 	return (
 		<Application>
 			<MainMenu>
@@ -584,8 +588,20 @@ export function DemoApp()
 						<p>Data: {data}</p>
 					)}
 				</Await>
-				<button type={"button"} onClick={() => setAsyncChange(asyncChange + 1)}>Change</button>
-				<button type={"button"} onClick={() => setAnotherChange(anotherChange + 1)}>Another change</button>
+				<button type={"button"} onClick={() => setAsyncChange(asyncChange + 1)}>Change async deps</button>
+				<button type={"button"} onClick={() => setAnotherChange(anotherChange + 1)}>Change something else</button>
+			</Card>
+
+			<h2>Error boundaries</h2>
+
+			<Card>
+				<button type={"button"} className={"error"}
+				        onClick={() => setFailingComponentsCount(failingComponentsCount + 1)}>Do something dangerous</button>
+				<NotifyErrorsBoundary fallback={<DemoResetComponent />}>
+					{
+						[...Array(failingComponentsCount)].map(() => <DemoFailingComponent />)
+					}
+				</NotifyErrorsBoundary>
 			</Card>
 
 		</Application>

demo/DemoFailingComponent.tsx

@@ -0,0 +1,26 @@
+import React from "react";
+import {useErrorBoundary} from "react-error-boundary";
+
+/**
+ * A simple demo failing component.
+ */
+export function DemoFailingComponent()
+{
+	throw new Error("Proudly thrown error.");
+	return (<p>I will never be shown...</p>);
+}
+
+/**
+ * A simple demo reset component.
+ */
+export function DemoResetComponent()
+{
+	// Get error boundary.
+	const errorBoundary = useErrorBoundary();
+
+	return (
+		<button type={"button"} onClick={() => {
+			errorBoundary.resetBoundary();
+		}}>Reset to try again!</button>
+	);
+}

index.ts

@@ -12,6 +12,7 @@ export {useCurtain} from "./src/Components/Curtains/CurtainInstance";
 export type {CurtainContextState} from "./src/Components/Curtains/CurtainInstance";
 export * from "./src/Components/Dates/Calendar";
 export * from "./src/Components/Dates/Datepicker";
+export * from "./src/Components/Errors/NotifyErrorsBoundary";
 export * from "./src/Components/Floating/Float";
 export * from "./src/Components/Floating/Tooltip";
 export * from "./src/Components/Forms/Checkbox";

package.json

@@ -1,5 +1,5 @@
 {
-	"version": "1.5.0",
+	"version": "1.6.0",
 	"name": "@kernelui/core",
 	"description": "Kernel UI Core.",
 	"scripts": {
@@ -21,6 +21,7 @@
 		"@fontsource-variable/jetbrains-mono": "^5.0.21",
 		"@fontsource-variable/manrope": "^5.0.20",
 		"@fontsource-variable/source-serif-4": "^5.0.19",
+		"react-error-boundary": "^4.0.13",
 		"react-merge-refs": "^2.1.1",
 		"uuid": "^10.0.0"
 	},

src/Components/Errors/NotifyErrorsBoundary.tsx

@@ -0,0 +1,36 @@
+import React, {useCallback, useMemo} from "react";
+import {ErrorBoundary, ErrorBoundaryProps} from "react-error-boundary";
+import {useNotify} from "../Notifications/Notifications";
+import {Notification, NotificationType} from "../Notifications/Notification";
+
+/**
+ * A React error boundary that show errors in notifications.
+ */
+export function NotifyErrorsBoundary({children, onError, fallback, fallbackRender, FallbackComponent, ...props}: React.PropsWithChildren<Partial<ErrorBoundaryProps>>)
+{
+	// Get notification function.
+	const notify = useNotify();
+
+	/**
+	 * Error handling function.
+	 */
+	const handleError = useCallback((error: Error, info: React.ErrorInfo) => {
+		// Show a notification about the error.
+		notify(<Notification type={NotificationType.ERROR}>Unexpected error: {error.message}</Notification>);
+		// Then call defined onError, if there is one.
+		onError?.(error, info);
+	}, [onError]);
+
+	// Define default fallback component.
+	const defaultFallback = useMemo(() => <></>, []);
+
+	if (!fallback && !fallbackRender && !FallbackComponent)
+		// Set default fallback if nothing is set.
+		fallback = defaultFallback;
+
+	return (
+		<ErrorBoundary onError={handleError} fallback={fallback} {...props}>
+			{children}
+		</ErrorBoundary>
+	);
+}

yarn.lock

@@ -229,6 +229,15 @@ __metadata:
   languageName: node
   linkType: hard
 
+"@babel/runtime@npm:^7.12.5":
+  version: 7.25.6
+  resolution: "@babel/runtime@npm:7.25.6"
+  dependencies:
+    regenerator-runtime: "npm:^0.14.0"
+  checksum: 10c0/d6143adf5aa1ce79ed374e33fdfd74fa975055a80bc6e479672ab1eadc4e4bfd7484444e17dd063a1d180e051f3ec62b357c7a2b817e7657687b47313158c3d2
+  languageName: node
+  linkType: hard
+
 "@babel/template@npm:^7.24.6":
   version: 7.24.6
   resolution: "@babel/template@npm:7.24.6"
@@ -576,6 +585,7 @@ __metadata:
     less: "npm:^4.2.0"
     react: "npm:^18.3.1"
     react-dom: "npm:^18.3.1"
+    react-error-boundary: "npm:^4.0.13"
     react-merge-refs: "npm:^2.1.1"
     react-router-dom: "npm:^6.24.1"
     typescript: "npm:^5.4.5"
@@ -2331,6 +2341,17 @@ __metadata:
   languageName: node
   linkType: hard
 
+"react-error-boundary@npm:^4.0.13":
+  version: 4.0.13
+  resolution: "react-error-boundary@npm:4.0.13"
+  dependencies:
+    "@babel/runtime": "npm:^7.12.5"
+  peerDependencies:
+    react: ">=16.13.1"
+  checksum: 10c0/6f3e0e4d7669f680ccf49c08c9571519c6e31f04dcfc30a765a7136c7e6fbbbe93423dd5a9fce12107f8166e54133e9dd5c2079a00c7a38201ac811f7a28b8e7
+  languageName: node
+  linkType: hard
+
 "react-merge-refs@npm:^2.1.1":
   version: 2.1.1
   resolution: "react-merge-refs@npm:2.1.1"
@@ -2378,6 +2399,13 @@ __metadata:
   languageName: node
   linkType: hard
 
+"regenerator-runtime@npm:^0.14.0":
+  version: 0.14.1
+  resolution: "regenerator-runtime@npm:0.14.1"
+  checksum: 10c0/1b16eb2c4bceb1665c89de70dcb64126a22bc8eb958feef3cd68fe11ac6d2a4899b5cd1b80b0774c7c03591dc57d16631a7f69d2daa2ec98100e2f29f7ec4cc4
+  languageName: node
+  linkType: hard
+
 "resolve@npm:~1.19.0":
   version: 1.19.0
   resolution: "resolve@npm:1.19.0"