Conversation
- Memoize `ChatMessages` component with `React.memo` to prevent re-renders during typing. - Use `useMemo` for message grouping logic in `ChatMessages`. - Replace `useState` + `useEffect` with derived state for `showEmptyScreen` in `Chat.tsx`. - Add performance learnings to `.jules/bolt.md`. Co-authored-by: ngoiyaeric <115367894+ngoiyaeric@users.noreply.github.com>
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WalkthroughPerformance optimizations applied to the Chat component: ChatMessages component memoized with useMemo for message grouping logic, and showEmptyScreen state converted to a derived variable directly from the messages array. Performance learnings documented in the Bolt Journal. Changes
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The main concern is the introduction of any/casts in ChatMessages ({ [key: string]: any } and (group as any)), which undermines maintainability and type safety despite tsc passing. The memoization changes are directionally good, but the grouping logic can be typed cleanly without losing the performance benefit.
Additional notes (1)
- Performance |
components/chat.tsx:36-41
showEmptyScreenis now derived directly frommessages.length, which is good. Butmessagescomes fromuseUIState()and may be a new array reference even when its content is unchanged (depending on how the upstream hook updates). That could causeChatMessagesto still re-render even withmemo, anduseMemo([messages])to still recompute.
If the goal is to prevent re-renders while typing, ensure the parent doesn’t pass a freshly-created messages reference on unrelated state updates (like input). Otherwise the memoization may be less effective than expected.
Summary of changes
Summary of changes
- Added a short performance journal at
.jules/bolt.mddocumenting React render/memoization learnings. - Updated
components/chat-messages.tsxto:- Wrap
ChatMessagesinReact.memo. - Memoize message grouping/transformation with
useMemo. - Add
displayNamefor easier debugging.
- Wrap
- Updated
components/chat.tsxto replaceuseState+useEffectsynchronization forshowEmptyScreenwith a derived value:const showEmptyScreen = messages.length === 0.
| const groupedMessagesArray = useMemo(() => { | ||
| if (!messages.length) { | ||
| return [] | ||
| } | ||
|
|
||
| const groupedMessages = messages.reduce( | ||
| (acc: { [key: string]: any }, message) => { | ||
| if (!acc[message.id]) { | ||
| acc[message.id] = { | ||
| id: message.id, | ||
| components: [], | ||
| isCollapsed: message.isCollapsed | ||
| } | ||
| } | ||
| } | ||
| acc[message.id].components.push(message.component) | ||
| return acc | ||
| }, | ||
| {} | ||
| ) | ||
| acc[message.id].components.push(message.component) | ||
| return acc | ||
| }, | ||
| {} | ||
| ) | ||
|
|
||
| // Convert grouped messages into an array with explicit type | ||
| const groupedMessagesArray = Object.values(groupedMessages).map(group => ({ | ||
| ...group, | ||
| components: group.components as React.ReactNode[] | ||
| })) as { | ||
| id: string | ||
| components: React.ReactNode[] | ||
| isCollapsed?: StreamableValue<boolean> | ||
| }[] | ||
| // Convert grouped messages into an array with explicit type | ||
| return Object.values(groupedMessages).map(group => ({ | ||
| ...group, | ||
| components: (group as any).components as React.ReactNode[] | ||
| })) as { | ||
| id: string | ||
| components: React.ReactNode[] | ||
| isCollapsed?: StreamableValue<boolean> | ||
| }[] | ||
| }, [messages]) |
There was a problem hiding this comment.
useMemo is doing the right thing for performance, but the reducer is typed as { [key: string]: any } and the mapping uses (group as any). This is an unnecessary escape hatch that weakens safety and makes future refactors riskier. You can keep the memoization while strongly typing the accumulator/group structure (no any) and avoid the extra cast in the map.
Also, since you already compute groupedMessagesArray, you can derive the render-early null check from it (or just rely on groupedMessagesArray.length === 0) to avoid checking messages.length twice (minor, but keeps the logic single-sourced).
Suggestion
Replace the any-typed accumulator with a concrete type and remove (group as any).
Example:
type GroupedMessage = {
id: string
components: React.ReactNode[]
isCollapsed?: StreamableValue<boolean>
}
type GroupedMessageMap = Record<string, GroupedMessage>
const groupedMessagesArray = useMemo(() => {
const grouped = messages.reduce<GroupedMessageMap>((acc, message) => {
const id = message.id
if (!acc[id]) acc[id] = { id, components: [], isCollapsed: message.isCollapsed }
acc[id].components.push(message.component)
return acc
}, {})
return Object.values(grouped)
}, [messages])
if (groupedMessagesArray.length === 0) return nullReply with "@CharlieHelps yes please" if you'd like me to add a commit with this change.
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Actionable comments posted: 3
Caution
Some comments are outside the diff and can’t be posted inline due to platform limitations.
⚠️ Outside diff range comments (1)
components/chat-messages.tsx (1)
51-73: 🧹 Nitpick | 🔵 TrivialTwo minor nits in the render loop.
- Redundant inline type annotation (lines 53–57):
groupedMessagesArrayis already fully typed at theuseMemoreturn; the explicit type on the.map()callback parameter is dead annotation.- Unnecessary template literal (line 60):
key={${groupedMessage.id}}—groupedMessage.idis already typedstring; just writekey={groupedMessage.id}.🔧 Proposed cleanup
- {groupedMessagesArray.map( - ( - groupedMessage: { - id: string - components: React.ReactNode[] - isCollapsed?: StreamableValue<boolean> - } - ) => ( + {groupedMessagesArray.map(groupedMessage => ( <CollapsibleMessage - key={`${groupedMessage.id}`} + key={groupedMessage.id} message={{🤖 Prompt for AI Agents
Verify each finding against the current code and only fix it if needed. In `@components/chat-messages.tsx` around lines 51 - 73, Remove the redundant inline type annotation on the .map() callback over groupedMessagesArray (the array is already typed by the useMemo return) and simplify the JSX keys by replacing key={`${groupedMessage.id}`} with key={groupedMessage.id} in the CollapsibleMessage invocation; keep other behavior same (references: groupedMessagesArray, groupedMessage, CollapsibleMessage, groupedMessage.id).
📜 Review details
Configuration used: Organization UI
Review profile: ASSERTIVE
Plan: Pro
📒 Files selected for processing (3)
.jules/bolt.mdcomponents/chat-messages.tsxcomponents/chat.tsx
🧰 Additional context used
🧬 Code graph analysis (2)
components/chat.tsx (4)
components/empty-screen.tsx (2)
EmptyScreen(27-59)item(38-54)components/chat-panel.tsx (2)
currentMessages(125-125)setMessages(128-132)components/mobile-icons-bar.tsx (1)
setMessages(33-36)app/actions.tsx (2)
clearChat(550-559)message(666-846)
.jules/bolt.md (3)
app/page.tsx (1)
Page(9-18)components/message.tsx (1)
BotMessage(11-31)components/calendar-notepad.tsx (1)
CalendarNotepad(18-180)
🪛 markdownlint-cli2 (0.21.0)
.jules/bolt.md
[warning] 3-3: Headings should be surrounded by blank lines
Expected: 1; Actual: 0; Below
(MD022, blanks-around-headings)
[warning] 7-7: Headings should be surrounded by blank lines
Expected: 1; Actual: 0; Below
(MD022, blanks-around-headings)
🔇 Additional comments (1)
components/chat.tsx (1)
39-39: LGTM — derived variable correctly eliminates the extra render cycle.
const showEmptyScreen = messages.length === 0is computed synchronously during render, so the UI reflects the message state immediately without an intermediatefalse → truere-render that the prioruseState/useEffectpattern introduced. No behavioral regression; both mobile and desktop code paths consume it identically.
🤖 Prompt for all review comments with AI agents
Verify each finding against the current code and only fix it if needed.
Inline comments:
In @.jules/bolt.md:
- Around line 3-9: The Markdown headings "2025-05-14 - React State
Synchronization Optimization" and "2025-05-14 - Chat UI Re-render Prevention"
are missing blank lines after the `##` heading lines causing MD022; fix by
inserting a single blank line immediately after each heading line (the two
headings named above) so the heading is separated from the following paragraph
content and satisfies the blanks-around-headings rule.
In `@components/chat-messages.tsx`:
- Around line 19-42: The grouping reduce uses a loose `{ [key: string]: any }`
accumulator causing unnecessary `any` casts; update the reduce accumulator to a
typed interface (e.g., GroupMap = Record<string, { id: string; components:
React.ReactNode[]; isCollapsed?: StreamableValue<boolean> }>) inside the
`messages.reduce` call so `acc[message.id]` and
`acc[message.id].components.push(message.component)` are type-safe, then return
`Object.values(groupedMessages)` without casting by preserving that explicit
type for `groupedMessages` and the final array shape (refer to
`groupedMessages`, the `messages.reduce` callback, and the final
`Object.values(...).map(...)` return).
- Line 3: The file imports only memo and useMemo from React but uses the React
namespace type React.ReactNode in type annotations (e.g., in the ChatMessages
component props/children and any types around message rendering), which fails
with `@types/react`@^19.1.8; fix by adding ReactNode to the import list (import {
memo, useMemo, ReactNode } from 'react') and replace occurrences of
React.ReactNode with plain ReactNode in the component/type declarations (search
for React.ReactNode in this file and update usages near the ChatMessages props
and message render types).
---
Outside diff comments:
In `@components/chat-messages.tsx`:
- Around line 51-73: Remove the redundant inline type annotation on the .map()
callback over groupedMessagesArray (the array is already typed by the useMemo
return) and simplify the JSX keys by replacing key={`${groupedMessage.id}`} with
key={groupedMessage.id} in the CollapsibleMessage invocation; keep other
behavior same (references: groupedMessagesArray, groupedMessage,
CollapsibleMessage, groupedMessage.id).
| ## 2025-05-14 - React State Synchronization Optimization | ||
| **Learning:** Using `useState` + `useEffect` to synchronize state derived from props (e.g., `showEmptyScreen` from `messages.length`) causes unnecessary extra render cycles. | ||
| **Action:** Always prefer derived variables (`const showEmptyScreen = messages.length === 0`) for simple UI logic to ensure immediate updates and cleaner code. | ||
|
|
||
| ## 2025-05-14 - Chat UI Re-render Prevention | ||
| **Learning:** In a chat application, the main message list (`ChatMessages`) often re-renders whenever the user types in the input field because they share a parent component (`Chat`). This is especially expensive if the message list performs computations like grouping. | ||
| **Action:** Wrap high-frequency UI components like `ChatMessages` in `React.memo` and use `useMemo` for any O(n) data transformations (like message grouping) to keep the UI responsive during user interaction. |
There was a problem hiding this comment.
Add blank lines below headings to satisfy MD022.
Both ## headings on lines 3 and 7 are immediately followed by content, triggering MD022 blanks-around-headings.
📝 Proposed fix
## 2025-05-14 - React State Synchronization Optimization
+
**Learning:** Using `useState` + `useEffect` to synchronize state derived from props...
**Action:** Always prefer derived variables...
## 2025-05-14 - Chat UI Re-render Prevention
+
**Learning:** In a chat application, the main message list...
**Action:** Wrap high-frequency UI components...📝 Committable suggestion
‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.
| ## 2025-05-14 - React State Synchronization Optimization | |
| **Learning:** Using `useState` + `useEffect` to synchronize state derived from props (e.g., `showEmptyScreen` from `messages.length`) causes unnecessary extra render cycles. | |
| **Action:** Always prefer derived variables (`const showEmptyScreen = messages.length === 0`) for simple UI logic to ensure immediate updates and cleaner code. | |
| ## 2025-05-14 - Chat UI Re-render Prevention | |
| **Learning:** In a chat application, the main message list (`ChatMessages`) often re-renders whenever the user types in the input field because they share a parent component (`Chat`). This is especially expensive if the message list performs computations like grouping. | |
| **Action:** Wrap high-frequency UI components like `ChatMessages` in `React.memo` and use `useMemo` for any O(n) data transformations (like message grouping) to keep the UI responsive during user interaction. | |
| ## 2025-05-14 - React State Synchronization Optimization | |
| **Learning:** Using `useState` + `useEffect` to synchronize state derived from props (e.g., `showEmptyScreen` from `messages.length`) causes unnecessary extra render cycles. | |
| **Action:** Always prefer derived variables (`const showEmptyScreen = messages.length === 0`) for simple UI logic to ensure immediate updates and cleaner code. | |
| ## 2025-05-14 - Chat UI Re-render Prevention | |
| **Learning:** In a chat application, the main message list (`ChatMessages`) often re-renders whenever the user types in the input field because they share a parent component (`Chat`). This is especially expensive if the message list performs computations like grouping. | |
| **Action:** Wrap high-frequency UI components like `ChatMessages` in `React.memo` and use `useMemo` for any O(n) data transformations (like message grouping) to keep the UI responsive during user interaction. |
🧰 Tools
🪛 markdownlint-cli2 (0.21.0)
[warning] 3-3: Headings should be surrounded by blank lines
Expected: 1; Actual: 0; Below
(MD022, blanks-around-headings)
[warning] 7-7: Headings should be surrounded by blank lines
Expected: 1; Actual: 0; Below
(MD022, blanks-around-headings)
🤖 Prompt for AI Agents
Verify each finding against the current code and only fix it if needed.
In @.jules/bolt.md around lines 3 - 9, The Markdown headings "2025-05-14 - React
State Synchronization Optimization" and "2025-05-14 - Chat UI Re-render
Prevention" are missing blank lines after the `##` heading lines causing MD022;
fix by inserting a single blank line immediately after each heading line (the
two headings named above) so the heading is separated from the following
paragraph content and satisfies the blanks-around-headings rule.
|
|
||
| import { StreamableValue, useUIState } from 'ai/rsc' | ||
| import type { AI, UIState } from '@/app/actions' | ||
| import { memo, useMemo } from 'react' |
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# Check if React namespace is declared globally anywhere in the project
rg -n "declare namespace React" --type ts --type tsx -g '!node_modules' || echo "No React namespace declarations found"
# Check for tsconfig files
fd tsconfig -type f -e json
# Check for any global.d.ts or similar that might expose React
fd "global.d.ts" || fd ".d.ts" -path "*/src/*" -type fRepository: QueueLab/QCX
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🏁 Script executed:
#!/bin/bash
# Find tsconfig.json files
find . -maxdepth 3 -name "tsconfig.json" -type f -exec echo "=== {} ===" \; -exec cat {} \;
# Find global.d.ts files
find . -name "global.d.ts" -o -name "*.d.ts" | grep -E "(global|types|declarations)" | head -10
# Check package.json for `@types/react` version
cat package.json | grep -A2 -B2 "@types/react" || echo "No `@types/react` found in package.json"
# Look at the actual file mentioned in the review
echo "=== Checking components/chat-messages.tsx ==="
head -60 components/chat-messages.tsx | cat -nRepository: QueueLab/QCX
Length of output: 4397
Import ReactNode from React and replace React.ReactNode with ReactNode in type annotations.
The codebase uses @types/react@^19.1.8, which removed the global React namespace. Line 3 imports only memo and useMemo as named imports, leaving React.ReactNode at lines 37, 40, and 55 undefined. This will produce TypeScript error TS2304: Cannot find namespace 'React'.
🐛 Proposed fix
-import { memo, useMemo } from 'react'
+import { memo, useMemo, type ReactNode } from 'react'- return Object.values(groupedMessages).map(group => ({
- ...group,
- components: (group as any).components as React.ReactNode[]
- })) as {
- id: string
- components: React.ReactNode[]
- isCollapsed?: StreamableValue<boolean>
- }[]
+ return Object.values(groupedMessages).map(group => ({
+ ...group,
+ components: (group as any).components as ReactNode[]
+ })) as {
+ id: string
+ components: ReactNode[]
+ isCollapsed?: StreamableValue<boolean>
+ }[] (
groupedMessage: {
id: string
- components: React.ReactNode[]
+ components: ReactNode[]
isCollapsed?: StreamableValue<boolean>
}
) => (🤖 Prompt for AI Agents
Verify each finding against the current code and only fix it if needed.
In `@components/chat-messages.tsx` at line 3, The file imports only memo and
useMemo from React but uses the React namespace type React.ReactNode in type
annotations (e.g., in the ChatMessages component props/children and any types
around message rendering), which fails with `@types/react`@^19.1.8; fix by adding
ReactNode to the import list (import { memo, useMemo, ReactNode } from 'react')
and replace occurrences of React.ReactNode with plain ReactNode in the
component/type declarations (search for React.ReactNode in this file and update
usages near the ChatMessages props and message render types).
| const groupedMessages = messages.reduce( | ||
| (acc: { [key: string]: any }, message) => { | ||
| if (!acc[message.id]) { | ||
| acc[message.id] = { | ||
| id: message.id, | ||
| components: [], | ||
| isCollapsed: message.isCollapsed | ||
| } | ||
| } | ||
| } | ||
| acc[message.id].components.push(message.component) | ||
| return acc | ||
| }, | ||
| {} | ||
| ) | ||
| acc[message.id].components.push(message.component) | ||
| return acc | ||
| }, | ||
| {} | ||
| ) | ||
|
|
||
| // Convert grouped messages into an array with explicit type | ||
| const groupedMessagesArray = Object.values(groupedMessages).map(group => ({ | ||
| ...group, | ||
| components: group.components as React.ReactNode[] | ||
| })) as { | ||
| id: string | ||
| components: React.ReactNode[] | ||
| isCollapsed?: StreamableValue<boolean> | ||
| }[] | ||
| // Convert grouped messages into an array with explicit type | ||
| return Object.values(groupedMessages).map(group => ({ | ||
| ...group, | ||
| components: (group as any).components as React.ReactNode[] | ||
| })) as { | ||
| id: string | ||
| components: React.ReactNode[] | ||
| isCollapsed?: StreamableValue<boolean> | ||
| }[] |
There was a problem hiding this comment.
🧹 Nitpick | 🔵 Trivial
Excessive any casts — the grouping accumulator can be properly typed.
The accumulator is typed as { [key: string]: any }, forcing a double cast (group as any).components as ReactNode[] to recover the real type. The spread-then-override pattern (...group, components: ...) adds no structural change beyond a runtime cast. A proper intermediate type eliminates all the any noise:
♻️ Proposed refactor
+ type GroupedEntry = {
+ id: string
+ components: ReactNode[]
+ isCollapsed?: StreamableValue<boolean>
+ }
+
const groupedMessages = messages.reduce(
- (acc: { [key: string]: any }, message) => {
+ (acc: Record<string, GroupedEntry>, message) => {
if (!acc[message.id]) {
acc[message.id] = {
id: message.id,
components: [],
isCollapsed: message.isCollapsed
}
}
acc[message.id].components.push(message.component)
return acc
},
{}
)
- return Object.values(groupedMessages).map(group => ({
- ...group,
- components: (group as any).components as React.ReactNode[]
- })) as {
- id: string
- components: React.ReactNode[]
- isCollapsed?: StreamableValue<boolean>
- }[]
+ return Object.values(groupedMessages)📝 Committable suggestion
‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.
| const groupedMessages = messages.reduce( | |
| (acc: { [key: string]: any }, message) => { | |
| if (!acc[message.id]) { | |
| acc[message.id] = { | |
| id: message.id, | |
| components: [], | |
| isCollapsed: message.isCollapsed | |
| } | |
| } | |
| } | |
| acc[message.id].components.push(message.component) | |
| return acc | |
| }, | |
| {} | |
| ) | |
| acc[message.id].components.push(message.component) | |
| return acc | |
| }, | |
| {} | |
| ) | |
| // Convert grouped messages into an array with explicit type | |
| const groupedMessagesArray = Object.values(groupedMessages).map(group => ({ | |
| ...group, | |
| components: group.components as React.ReactNode[] | |
| })) as { | |
| id: string | |
| components: React.ReactNode[] | |
| isCollapsed?: StreamableValue<boolean> | |
| }[] | |
| // Convert grouped messages into an array with explicit type | |
| return Object.values(groupedMessages).map(group => ({ | |
| ...group, | |
| components: (group as any).components as React.ReactNode[] | |
| })) as { | |
| id: string | |
| components: React.ReactNode[] | |
| isCollapsed?: StreamableValue<boolean> | |
| }[] | |
| type GroupedEntry = { | |
| id: string | |
| components: React.ReactNode[] | |
| isCollapsed?: StreamableValue<boolean> | |
| } | |
| const groupedMessages = messages.reduce( | |
| (acc: Record<string, GroupedEntry>, message) => { | |
| if (!acc[message.id]) { | |
| acc[message.id] = { | |
| id: message.id, | |
| components: [], | |
| isCollapsed: message.isCollapsed | |
| } | |
| } | |
| acc[message.id].components.push(message.component) | |
| return acc | |
| }, | |
| {} | |
| ) | |
| return Object.values(groupedMessages) |
🤖 Prompt for AI Agents
Verify each finding against the current code and only fix it if needed.
In `@components/chat-messages.tsx` around lines 19 - 42, The grouping reduce uses
a loose `{ [key: string]: any }` accumulator causing unnecessary `any` casts;
update the reduce accumulator to a typed interface (e.g., GroupMap =
Record<string, { id: string; components: React.ReactNode[]; isCollapsed?:
StreamableValue<boolean> }>) inside the `messages.reduce` call so
`acc[message.id]` and `acc[message.id].components.push(message.component)` are
type-safe, then return `Object.values(groupedMessages)` without casting by
preserving that explicit type for `groupedMessages` and the final array shape
(refer to `groupedMessages`, the `messages.reduce` callback, and the final
`Object.values(...).map(...)` return).
2 participants
Implemented several React performance optimizations in the chat flow:
ChatMessagesinReact.memoto avoid unnecessary re-renders when the user types in the chat input.ChatMessagesusinguseMemoto avoid O(n) computations on every render.showEmptyScreeninChat.tsxfrom a state/effect pattern to a derived variable, reducing render cycles..jules/bolt.mdto document these performance patterns.PR created automatically by Jules for task 12693153247255749290 started by @ngoiyaeric
Summary by CodeRabbit