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perf(cli): truncate large debug logs and limit message history #18663

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Merged
mattKorwel merged 5 commits into from
Feb 11, 2026
Merged

perf(cli): truncate large debug logs and limit message history #18663

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3501163
perf: limit debug console message history and truncate large logs
mattKorwel Feb 9, 2026
c76ace1
perf: move truncation to UI hook to preserve full logs in files
mattKorwel Feb 9, 2026
e453167
Merge branch 'main' into fix/debug-log-memory
mattKorwel Feb 9, 2026
4d8bed3
Merge branch 'main' into fix/debug-log-memory
mattKorwel Feb 10, 2026
a027782
Merge branch 'main' into fix/debug-log-memory
mattKorwel Feb 10, 2026
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27 changes: 25 additions & 2 deletions packages/cli/src/ui/hooks/useConsoleMessages.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -31,6 +31,7 @@ function consoleMessagesReducer(
state: ConsoleMessageItem[],
action: Action,
): ConsoleMessageItem[] {
const MAX_CONSOLE_MESSAGES = 1000;
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@jacob314 jacob314 Feb 9, 2026

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nit: move const to the top level.

switch (action.type) {
case 'ADD_MESSAGES': {
const newMessages = [...state];
Expand All @@ -51,6 +52,12 @@ function consoleMessagesReducer(
newMessages.push({ ...queuedMessage, count: 1 });
}
}

// Limit the number of messages to prevent memory issues
if (newMessages.length > MAX_CONSOLE_MESSAGES) {
return newMessages.slice(newMessages.length - MAX_CONSOLE_MESSAGES);
}

return newMessages;
}
case 'CLEAR':
Expand Down Expand Up @@ -91,9 +98,17 @@ export function useConsoleMessages(): UseConsoleMessagesReturn {

useEffect(() => {
const handleConsoleLog = (payload: ConsoleLogPayload) => {
let content = payload.content;
const MAX_CONSOLE_MSG_LENGTH = 10000;
if (content.length > MAX_CONSOLE_MSG_LENGTH) {
content =
content.slice(0, MAX_CONSOLE_MSG_LENGTH) +
`... [Truncated ${content.length - MAX_CONSOLE_MSG_LENGTH} characters]`;
}

handleNewMessage({
type: payload.type,
content: payload.content,
content,
count: 1,
});
};
Expand All @@ -102,10 +117,18 @@ export function useConsoleMessages(): UseConsoleMessagesReturn {
isStderr: boolean;
chunk: Uint8Array | string;
}) => {
const content =
let content =
typeof payload.chunk === 'string'
? payload.chunk
: new TextDecoder().decode(payload.chunk);

const MAX_OUTPUT_CHUNK_LENGTH = 10000;
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@jacob314 jacob314 Feb 9, 2026

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nit: add a helper for this string truncation logic

if (content.length > MAX_OUTPUT_CHUNK_LENGTH) {
content =
content.slice(0, MAX_OUTPUT_CHUNK_LENGTH) +
`... [Truncated ${content.length - MAX_OUTPUT_CHUNK_LENGTH} characters]`;
}

// It would be nice if we could show stderr as 'warn' but unfortunately
// we log non warning info to stderr before the app starts so that would
// be misleading.
Expand Down
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