Integrate useTransition Hook for Optimized State Transitions

packages/frontend/src/components/ButtonSpinner.tsx

@@ -2,14 +2,7 @@ import React from "react";
 import { Spinner } from "react-bootstrap";
 
 const ButtonSpinner = () => (
-  <Spinner
-    as="span"
-    animation="border"
-    size="sm"
-    role="status"
-    aria-hidden="true"
-    className="mr-1"
-  />
+  <Spinner as="span" animation="border" size="sm" role="status" aria-hidden="true" className="mr-1" />
 );
 
 export { ButtonSpinner };

packages/frontend/src/components/PageContainer.tsx

@@ -1,10 +1,7 @@
 import React from "react";
 import { Card } from "react-bootstrap";
 
-const PageContainer = (props: {
-  header: React.ReactNode;
-  children: React.ReactNode;
-}) => (
+const PageContainer = (props: { header: React.ReactNode; children: React.ReactNode }) => (
   <Card>
     <Card.Header>{props.header}</Card.Header>
     <Card.Body>{props.children}</Card.Body>

packages/frontend/src/content/CreateNote.tsx

@@ -1,4 +1,4 @@
-import React, { useState, FormEvent } from "react";
+import React, { useState, FormEvent, useTransition } from "react";
 import { Form, Button, Alert } from "react-bootstrap";
 import { navigate, RouteComponentProps } from "@reach/router";
 import { GATEWAY_URL } from "../config";
@@ -10,7 +10,7 @@ import { PlayAudioButton } from "./PlayAudioButton";
 const MAX_FILE_SIZE = 2000000;
 
 const CreateNote = (props: RouteComponentProps) => {
-  const [isLoading, setIsLoading] = useState(false);
+  const [isPending, startTransition] = useTransition();
   const [errorMsg, setErrorMsg] = useState("");
   const [noteContent, setNoteContent] = useState("");
   const [file, setFile] = useState();
@@ -26,24 +26,21 @@ const CreateNote = (props: RouteComponentProps) => {
       setErrorMsg(`File can't be bigger than ${MAX_FILE_SIZE / 1000000} MB`);
       return;
     }
+    startTransition(async () => {
+      const createNoteURL = `${GATEWAY_URL}notes`;
 
-    setIsLoading(true);
-
-    const createNoteURL = `${GATEWAY_URL}notes`;
-
-    try {
-      // @ts-ignore Argument of type 'undefined' is not assignable to parameter of type 'File'
-      const attachment = file ? await putObject(file) : undefined;
-      await fetch(createNoteURL, {
-        method: "POST",
-        body: JSON.stringify({ attachment, content: noteContent }),
-      });
-      navigate("/");
-    } catch (error) {
-      setErrorMsg(`${error.toString()} - ${createNoteURL} - ${noteContent}`);
-    } finally {
-      setIsLoading(false);
-    }
+      try {
+        // @ts-ignore Argument of type 'undefined' is not assignable to parameter of type 'File'
+        const attachment = file ? await putObject(file) : undefined;
+        await fetch(createNoteURL, {
+          method: "POST",
+          body: JSON.stringify({ attachment, content: noteContent }),
+        });
+        navigate("/");
+      } catch (error) {
+        setErrorMsg(`${error.toString()} - ${createNoteURL} - ${noteContent}`);
+      }
+    });
   };
 
   const noteContentAdditionalProps = isRecording || isPlaying ? { disabled: true, value: noteContent } : {};
@@ -90,9 +87,9 @@ const CreateNote = (props: RouteComponentProps) => {
             type="file"
           />
         </Form.Group>
-        <Button type="submit" disabled={!noteContent || isLoading} block>
-          {isLoading ? <ButtonSpinner /> : ""}
-          {isLoading ? "Creating..." : "Create"}
+        <Button type="submit" disabled={!noteContent || isPending} block>
+          {isPending ? <ButtonSpinner /> : ""}
+          {isPending ? "Creating..." : "Create"}
         </Button>
       </form>
     </PageContainer>

packages/frontend/src/content/DeleteNoteButton.tsx

@@ -1,4 +1,4 @@
-import React, { useState } from "react";
+import React, { useState, useTransition } from "react";
 import { Button, Alert } from "react-bootstrap";
 import { GATEWAY_URL } from "../config";
 import { navigate } from "@reach/router";
@@ -7,28 +7,26 @@ import { ButtonSpinner } from "../components";
 
 const DeleteNoteButton = (props: { noteId: string; attachment?: string }) => {
   const { noteId, attachment } = props;
-  const [isDeleting, setIsDeleting] = useState(false);
+  const [isDeleting, startTransition] = useTransition();
   const [errorMsg, setErrorMsg] = useState("");
 
-  const handleDelete = async (event: any) => {
+  const handleDelete = (event: React.MouseEvent<HTMLButtonElement>) => {
     event.preventDefault();
-    setIsDeleting(true);
+    startTransition(async () => {
+      const deleteNoteURL = `${GATEWAY_URL}notes/${noteId}`;
 
-    const deleteNoteURL = `${GATEWAY_URL}notes/${noteId}`;
-
-    try {
-      if (attachment) {
-        await deleteObject(attachment);
+      try {
+        if (attachment) {
+          await deleteObject(attachment);
+        }
+        await fetch(deleteNoteURL, {
+          method: "DELETE",
+        });
+        navigate("/");
+      } catch (error) {
+        setErrorMsg(`${error.toString()} - ${deleteNoteURL} - ${noteId}`);
       }
-      await fetch(deleteNoteURL, {
-        method: "DELETE",
-      });
-      navigate("/");
-    } catch (error) {
-      setErrorMsg(`${error.toString()} - ${deleteNoteURL} - ${noteId}`);
-    } finally {
-      setIsDeleting(false);
-    }
+    });
   };
 
   return (

packages/frontend/src/content/ListNotes.tsx

@@ -1,4 +1,4 @@
-import React, { useState, useEffect } from "react";
+import React, { useState, useTransition, useEffect } from "react";
 import { Link, RouteComponentProps } from "@reach/router";
 import { GATEWAY_URL } from "../config";
 import { Card, Alert, CardColumns, Button } from "react-bootstrap";
@@ -11,24 +11,23 @@ interface Note {
 }
 
 const ListNotes = (props: RouteComponentProps) => {
-  const [isLoading, setIsLoading] = useState(true);
+  const [isPending, startTransition] = useTransition();
   const [errorMsg, setErrorMsg] = useState("");
-  const [notes, setNotes] = useState([]);
+  const [notes, setNotes] = useState<Note[]>([]);
 
   useEffect(() => {
-    const fetchNotes = async () => {
-      setIsLoading(true);
-      const fetchURL = `${GATEWAY_URL}notes`;
+    const fetchNotes = () => {
+      startTransition(async () => {
+        const fetchURL = `${GATEWAY_URL}notes`;
 
-      try {
-        const response = await fetch(fetchURL);
-        const data = await response.json();
-        setNotes(data);
-      } catch (error) {
-        setErrorMsg(`${error.toString()} - ${fetchURL}`);
-      } finally {
-        setIsLoading(false);
-      }
+        try {
+          const response = await fetch(fetchURL);
+          const data = await response.json();
+          setNotes(data);
+        } catch (error) {
+          setErrorMsg(`${error.toString()} - ${fetchURL}`);
+        }
+      });
     };
     fetchNotes();
   }, []);
@@ -65,7 +64,7 @@ const ListNotes = (props: RouteComponentProps) => {
   return (
     <PageContainer header={<div>Your Notes</div>}>
       {errorMsg && <Alert variant="danger">{errorMsg}</Alert>}
-      {isLoading ? (
+      {isPending ? (
         <Loading />
       ) : (
         <div>

packages/frontend/src/content/SaveNoteButton.tsx

@@ -1,40 +1,38 @@
-import React, { useState } from "react";
+import React, { useState, useTransition } from "react";
 import { Button, Alert } from "react-bootstrap";
 import { GATEWAY_URL } from "../config";
 import { navigate } from "@reach/router";
 import { ButtonSpinner } from "../components";
 
 const SaveNoteButton = (props: { noteId: string; noteContent: string }) => {
-  const [isSaving, setIsSaving] = useState(false);
+  const [isPending, startTransition] = useTransition();
   const [errorMsg, setErrorMsg] = useState("");
 
   const handleSave = async (event: any) => {
     event.preventDefault();
-    setIsSaving(true);
+    startTransition(async () => {
+      const { noteId, noteContent } = props;
+      const updateNoteURL = `${GATEWAY_URL}notes/${noteId}`;
 
-    const { noteId, noteContent } = props;
-    const updateNoteURL = `${GATEWAY_URL}notes/${noteId}`;
-
-    try {
-      await fetch(updateNoteURL, {
-        method: "PUT",
-        body: JSON.stringify({ content: noteContent }),
-      });
-      navigate("/");
-    } catch (error) {
-      console.log(error);
-      setErrorMsg(`${error.toString()} - ${updateNoteURL} - ${noteContent}`);
-    } finally {
-      setIsSaving(false);
-    }
+      try {
+        await fetch(updateNoteURL, {
+          method: "PUT",
+          body: JSON.stringify({ content: noteContent }),
+        });
+        navigate("/");
+      } catch (error) {
+        console.log(error);
+        setErrorMsg(`${error.toString()} - ${updateNoteURL} - ${noteContent}`);
+      }
+    });
   };
 
   return (
     <>
       {errorMsg && <Alert variant="danger">{errorMsg}</Alert>}
-      <Button disabled={isSaving} onClick={handleSave} block>
-        {isSaving ? <ButtonSpinner /> : ""}
-        {isSaving ? "Saving..." : "Save"}
+      <Button disabled={isPending} onClick={handleSave} block>
+        {isPending ? <ButtonSpinner /> : ""}
+        {isPending ? "Saving..." : "Save"}
       </Button>
     </>
   );

packages/frontend/src/content/ShowNote.tsx

@@ -1,4 +1,4 @@
-import React, { useState, useEffect } from "react";
+import React, { useState, useEffect, useTransition } from "react";
 import { RouteComponentProps, navigate } from "@reach/router";
 import { Form, Card } from "react-bootstrap";
 import { GATEWAY_URL } from "../config";
@@ -8,37 +8,36 @@ import { HomeButton, Loading, PageContainer } from "../components";
 
 const ShowNote = (props: RouteComponentProps<{ noteId: string }>) => {
   const { noteId } = props;
-  const [isLoading, setIsLoading] = useState(true);
+  const [isPending, startTransition] = useTransition();
   const [noteContent, setNoteContent] = useState("");
   const [attachment, setAttachment] = useState("");
   const [attachmentURL, setAttachmentURL] = useState("");
 
+
   useEffect(() => {
-    const fetchNote = async (noteId: string) => {
-      setIsLoading(true);
-      const fetchURL = `${GATEWAY_URL}notes/${noteId}`;
+    if (noteId) {
+      startTransition(async () => {
+        const fetchURL = `${GATEWAY_URL}notes/${noteId}`;
 
-      try {
-        const response = await fetch(fetchURL);
-        const data = await response.json();
-        setNoteContent(data.content);
-        if (data.attachment) {
-          setAttachment(data.attachment);
-          setAttachmentURL(await getObjectUrl(data.attachment));
+        try {
+          const response = await fetch(fetchURL);
+          const data = await response.json();
+          setNoteContent(data.content);
+          if (data.attachment) {
+            setAttachment(data.attachment);
+            setAttachmentURL(await getObjectUrl(data.attachment));
+          }
+        } catch (error) {
+          // Navigate to 404 page, as noteId probably not present
+          navigate("/404");
         }
-      } catch (error) {
-        // Navigate to 404 page, as noteId probably not present
-        navigate("/404");
-      } finally {
-        setIsLoading(false);
-      }
-    };
-    fetchNote(noteId || "");
+      });
+    }
   }, [noteId]);
 
   return (
     <PageContainer header={<HomeButton />}>
-      {isLoading ? (
+      {isPending ? (
         <Loading />
       ) : (
         <form>