From 1965b3abd6938a038668ecfc922125681dd7601e Mon Sep 17 00:00:00 2001
From: Stefan Probst <stefanprobst@posteo.de>
Date: Mon, 27 Jan 2025 16:46:30 +0100
Subject: [PATCH] feat: add error boundary component

---
 components/error-boundary.tsx | 78 +++++++++++++++++++++++++++++++++++
 1 file changed, 78 insertions(+)
 create mode 100644 components/error-boundary.tsx

diff --git a/components/error-boundary.tsx b/components/error-boundary.tsx
new file mode 100644
index 0000000..0041781
--- /dev/null
+++ b/components/error-boundary.tsx
@@ -0,0 +1,78 @@
+"use client";
+
+import { assert } from "@acdh-oeaw/lib";
+import { Component, createContext, type ErrorInfo, type ReactNode, useContext } from "react";
+
+interface ErrorBoundaryContextValue {
+	error: Error;
+	reset: () => void;
+}
+
+const ErrorBoundaryContext = createContext<ErrorBoundaryContextValue | null>(null);
+
+export function useErrorBoundary() {
+	const value = useContext(ErrorBoundaryContext);
+
+	assert(value != null, "`useErrorBoundary` must be used within an `ErrorBoundary` component.");
+
+	return value;
+}
+
+interface ErrorBoundaryProps {
+	children: ReactNode;
+	fallback: ReactNode;
+	onError?: (error: Error, errorInfo: ErrorInfo) => void;
+}
+
+type ErrorBoundaryState =
+	| {
+			status: "default";
+			error: null;
+	  }
+	| {
+			status: "error";
+			error: Error;
+	  };
+
+const initialState: ErrorBoundaryState = {
+	status: "default",
+	error: null,
+};
+
+export class ErrorBoundary extends Component<ErrorBoundaryProps, ErrorBoundaryState> {
+	constructor(props: ErrorBoundaryProps) {
+		super(props);
+
+		this.state = initialState;
+
+		this.reset = this.reset.bind(this);
+	}
+
+	static getDerivedStateFromError(error: unknown) {
+		return {
+			status: "error",
+			error: error instanceof Error ? error : new Error(`Error: ${String(error)}`),
+		};
+	}
+
+	componentDidCatch(error: Error, errorInfo: ErrorInfo) {
+		this.props.onError?.(error, errorInfo);
+	}
+
+	reset() {
+		this.setState(initialState);
+	}
+
+	render() {
+		if (this.state.status === "error") {
+			return (
+				// eslint-disable-next-line @typescript-eslint/unbound-method
+				<ErrorBoundaryContext.Provider value={{ error: this.state.error, reset: this.reset }}>
+					{this.props.fallback}
+				</ErrorBoundaryContext.Provider>
+			);
+		}
+
+		return this.props.children;
+	}
+}