Use suspense / error boundary

src/App.tsx

@@ -6,16 +6,13 @@ import StringFilter from "./components/StringFilter/StringFilter";
 import useGlossary from "./hooks/useGlossary";
 
 function App() {
-  const { glossary, citations, isLoading, isError } = useGlossary();
+  const { glossary, citations } = useGlossary();
 
   const [alphabeticalFilter, setAlphabeticalFilter] = useState("");
   const [stringFilter, setStringFilter] = useState("");
   const [selectedCitation, setSelectedCitation] = useState<string | null>(null);
 
-  if (isLoading) return <div>Loading...</div>;
+  const entries = glossary
-  if (isError) return <div>Error while fetching</div>;
-
-  const entries = glossary!
     .filter((entry) => {
       if (!stringFilter) {
         return true;
@@ -40,7 +37,7 @@ function App() {
       {selectedCitation && (
         <CitationEntry
           citation={
-            citations!.find((citation) => citation.key === selectedCitation)!
+            citations.find((citation) => citation.key === selectedCitation)!
           }
           onClose={() => setSelectedCitation(null)}
         />

src/components/ErrorBoundary/ErrorBoundary.css

@@ -0,0 +1,9 @@
+.error-boundary {
+  color: red;
+  font-size: 1.2rem;
+  text-align: center;
+
+  pre {
+    color: var(--color-text);
+  }
+}

src/components/ErrorBoundary/ErrorBoundary.tsx

@@ -0,0 +1,43 @@
+import type { ReactNode } from "react";
+import React, { Component } from "react";
+
+import "./ErrorBoundary.css";
+
+interface ErrorBoundaryProps {
+  children: ReactNode;
+}
+
+interface ErrorBoundaryState {
+  hasError: boolean;
+  error: Error | null;
+}
+
+class ErrorBoundary extends Component<ErrorBoundaryProps, ErrorBoundaryState> {
+  constructor(props: ErrorBoundaryProps) {
+    super(props);
+    this.state = { hasError: false, error: null };
+  }
+
+  static getDerivedStateFromError(error: Error) {
+    return { hasError: true, error };
+  }
+
+  // eslint-disable-next-line @typescript-eslint/no-unused-vars
+  componentDidCatch(_: Error, __: React.ErrorInfo) {
+    // You can log the error to an error reporting service here
+  }
+
+  render() {
+    if (this.state.hasError) {
+      return (
+        <div className="error-boundary">
+          <h2>Something went wrong.</h2>
+          <pre>{this.state.error?.message}</pre>
+        </div>
+      );
+    }
+    return this.props.children;
+  }
+}
+
+export default ErrorBoundary;

src/hooks/useGlossary.ts

@@ -1,13 +1,13 @@
-import { useQuery } from "@tanstack/react-query";
+import { useSuspenseQuery } from "@tanstack/react-query";
 import { fetchCitations, fetchDefinitions } from "../lib/nist-api";
 
 const useGlossary = () => {
-  const definitionsQuery = useQuery({
+  const definitionsQuery = useSuspenseQuery({
     queryKey: ["definitions"],
     queryFn: fetchDefinitions,
     staleTime: 1000 * 60 * 60, // 1 hour
   });
-  const citationsQuery = useQuery({
+  const citationsQuery = useSuspenseQuery({
     queryKey: ["citations"],
     queryFn: fetchCitations,
     staleTime: 1000 * 60 * 60, // 1 hour
@@ -16,8 +16,6 @@ const useGlossary = () => {
   return {
     glossary: definitionsQuery.data,
     citations: citationsQuery.data,
-    isLoading: definitionsQuery.isLoading || citationsQuery.isLoading,
-    isError: definitionsQuery.isError || citationsQuery.isError,
   };
 };
 

src/lib/nist-api.ts

@@ -38,6 +38,7 @@ const citationGid = "2053825396";
 const makeClient = () => {
   const client = new Axios({
     baseURL: baseUrl,
+    timeout: 2500,
   });
   return client;
 };
@@ -62,18 +63,6 @@ export const fetchDefinitions = async () => {
   return parseDefinitions(resp.data);
 };
 
-export const parseGlossary = (
-  glossaryData: string,
-  citationData: string
-): Glossary => {
-  const glossary: Glossary = {
-    definitions: parseDefinitions(glossaryData),
-    citations: parseCitations(citationData),
-  };
-
-  return glossary;
-};
-
 const parseDefinitions = (glossaryData: string): GlossaryTerm[] => {
   const terms: GlossaryTerm[] = [];
   const parsed = Papa.parse<string[]>(glossaryData, {

src/main.tsx

@@ -1,15 +1,26 @@
 import { QueryClient, QueryClientProvider } from "@tanstack/react-query";
 import { ReactQueryDevtools } from "@tanstack/react-query-devtools";
-import { StrictMode } from "react";
+import { StrictMode, Suspense } from "react";
 import { createRoot } from "react-dom/client";
 import App from "./App.tsx";
+import ErrorBoundary from "./components/ErrorBoundary/ErrorBoundary";
 import "./index.css";
 const queryClient = new QueryClient();
 
 createRoot(document.getElementById("root")!).render(
   <StrictMode>
     <QueryClientProvider client={queryClient}>
-      <App />
+      <ErrorBoundary>
+        <Suspense
+          fallback={
+            <div style={{ textAlign: "center", marginTop: "2rem" }}>
+              Loading...
+            </div>
+          }
+        >
+          <App />
+        </Suspense>
+      </ErrorBoundary>
       <ReactQueryDevtools initialIsOpen={false} />
     </QueryClientProvider>
   </StrictMode>