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fix(web): stop rapid localStorage flip when removing a language model (#1295)
* fix(web): stop rapid localStorage flip when removing a language model The selected-language-model state was owned by a useSelectedLanguageModel hook instantiated in three chat components, each running its own reset effect against the shared "selectedLanguageModel" localStorage key. Since usehooks-ts broadcasts a storage event on every write, those instances re-triggered each other into a rapid write loop when a model was removed. Lift the state into a single LanguageModelProvider mounted once in the (app) layout. The hook is now a thin context consumer, so there is exactly one owner of the localStorage state and one reset effect. The reset is also made idempotent (only writes when the resolved selection differs by key). Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com> * docs: add CHANGELOG entry for #1295 Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com> --------- Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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‎CHANGELOG.md‎

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@@ -18,6 +18,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
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- Upgraded `ws` to `^8.20.1`. [#1286](https://github.com/sourcebot-dev/sourcebot/pull/1286)
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- Upgraded `hono` to `^4.12.24`. [#1289](https://github.com/sourcebot-dev/sourcebot/pull/1289)
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- Surfaced an actionable error when the Lighthouse licensing service is unreachable, instead of a generic "unexpected error". [#1293](https://github.com/sourcebot-dev/sourcebot/pull/1293)
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- Fixed the selected language model rapidly flipping in local storage after a language model was removed. [#1295](https://github.com/sourcebot-dev/sourcebot/pull/1295)
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## [5.0.1] - 2026-06-04
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‎packages/web/src/app/(app)/askgh/[owner]/[repo]/components/landingPage.tsx‎

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@@ -75,7 +75,6 @@ export const LandingPage = ({
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}}
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className="min-h-[50px]"
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isRedirecting={isLoading}
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languageModels={languageModels}
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selectedSearchScopes={selectedSearchScopes}
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searchContexts={[]}
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isDisabled={isChatBoxDisabled}

‎packages/web/src/app/(app)/chat/components/landingPageChatBox.tsx‎

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@@ -42,7 +42,6 @@ export const LandingPageChatBox = ({
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}}
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className="min-h-[50px]"
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isRedirecting={isLoading}
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languageModels={languageModels}
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selectedSearchScopes={selectedSearchScopes}
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searchContexts={searchContexts}
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isDisabled={isChatBoxDisabled}

‎packages/web/src/app/(app)/layout.tsx‎

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@@ -36,6 +36,8 @@ import { CheckoutReturnHandler } from "@/features/billing/checkoutReturnHandler"
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import { RoleProvider } from "@/features/auth/roleProvider";
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import { HasLicenseProvider } from "@/features/billing/hasLicenseProvider";
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import { tryGetLatestSourcebotTag } from "./components/banners/actions";
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import { LanguageModelProvider } from "@/features/chat/languageModelContext";
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import { getConfiguredLanguageModelsInfo } from "@/features/chat/utils.server";
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interface LayoutProps {
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children: React.ReactNode;
@@ -175,39 +177,43 @@ export default async function Layout(props: LayoutProps) {
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timeoutMs: 3000
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});
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const languageModels = await getConfiguredLanguageModelsInfo();
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return (
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<RoleProvider role={role}>
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<HasLicenseProvider
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hasLicense={offlineLicense !== null || license !== null}
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>
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<SyntaxGuideProvider>
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<div className="fixed inset-0 flex bg-shell">
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<SidebarProvider defaultOpen={cookieStore.get("sidebar_state")?.value !== "false"}>
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{sidebar}
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<div className="flex-1 min-h-0 flex flex-col pt-2 pb-2 pr-2 pl-2 md:pl-0">
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<div className="flex-1 min-h-0 bg-background flex flex-col border border-[#e6e6e6] dark:border-[#1d1d1f] rounded-xl overflow-hidden">
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<BannerHeightObserver>
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<BannerSlot
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role={role}
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license={license}
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offlineLicense={offlineLicense}
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hasPermissionSyncEntitlement={hasPermissionSyncEntitlement}
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hasPendingFirstSync={hasPendingFirstSync}
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currentVersion={SOURCEBOT_VERSION}
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latestVersion={latestVersion}
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/>
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</BannerHeightObserver>
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<div className="flex-1 min-h-0 overflow-y-scroll [scrollbar-gutter:stable]">
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{children}
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<LanguageModelProvider languageModels={languageModels}>
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<SyntaxGuideProvider>
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<div className="fixed inset-0 flex bg-shell">
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<SidebarProvider defaultOpen={cookieStore.get("sidebar_state")?.value !== "false"}>
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{sidebar}
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<div className="flex-1 min-h-0 flex flex-col pt-2 pb-2 pr-2 pl-2 md:pl-0">
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<div className="flex-1 min-h-0 bg-background flex flex-col border border-[#e6e6e6] dark:border-[#1d1d1f] rounded-xl overflow-hidden">
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<BannerHeightObserver>
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<BannerSlot
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role={role}
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license={license}
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offlineLicense={offlineLicense}
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hasPermissionSyncEntitlement={hasPermissionSyncEntitlement}
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hasPendingFirstSync={hasPendingFirstSync}
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currentVersion={SOURCEBOT_VERSION}
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latestVersion={latestVersion}
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/>
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</BannerHeightObserver>
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<div className="flex-1 min-h-0 overflow-y-scroll [scrollbar-gutter:stable]">
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{children}
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</div>
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</div>
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</div>
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</div>
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</SidebarProvider>
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</div>
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<SyntaxReferenceGuide />
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<GitHubStarToast />
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<CheckoutReturnHandler />
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</SyntaxGuideProvider>
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</SidebarProvider>
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</div>
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<SyntaxReferenceGuide />
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<GitHubStarToast />
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<CheckoutReturnHandler />
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</SyntaxGuideProvider>
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</LanguageModelProvider>
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</HasLicenseProvider>
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</RoleProvider>
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)

‎packages/web/src/ee/features/chat/components/chatThread/chatThread.tsx‎

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@@ -115,9 +115,7 @@ export const ChatThread = ({
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});
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const [isFailedMcpBannerVisible, setIsFailedMcpBannerVisible] = useState(false);
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const { selectedLanguageModel } = useSelectedLanguageModel({
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languageModels,
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});
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const { selectedLanguageModel } = useSelectedLanguageModel();
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// Refs to capture the latest request params for the transport body.
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// The transport is created once (useMemo) but params change over time,
@@ -478,7 +476,6 @@ export const ChatThread = ({
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isTurnInProgress={isTurnInProgress}
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isNetworkActive={isNetworkActive}
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onStop={stop}
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languageModels={languageModels}
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selectedSearchScopes={selectedSearchScopes}
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searchContexts={searchContexts}
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isDisabled={languageModels.length === 0}

‎packages/web/src/features/chat/components/chatBox/chatBox.tsx‎

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@@ -3,7 +3,7 @@
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import { VscodeFileIcon } from "@/app/components/vscodeFileIcon";
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import { Button } from "@/components/ui/button";
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import { Tooltip, TooltipContent, TooltipTrigger } from "@/components/ui/tooltip";
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import { CustomEditor, LanguageModelInfo, MentionElement, RenderElementPropsFor, SearchScope } from "@/features/chat/types";
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import { CustomEditor, MentionElement, RenderElementPropsFor, SearchScope } from "@/features/chat/types";
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import { insertMention, slateContentToString } from "@/features/chat/utils";
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import { cn } from "@/lib/utils";
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import { useIsMac } from "@/hooks/useIsMac";
@@ -37,7 +37,6 @@ interface ChatBoxProps {
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isTurnInProgress?: boolean;
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isNetworkActive?: boolean;
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isDisabled?: boolean;
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languageModels: LanguageModelInfo[];
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selectedSearchScopes: SearchScope[];
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searchContexts: SearchContextQuery[];
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isLoginWallEnabled: boolean;
@@ -55,7 +54,6 @@ const ChatBoxComponent = ({
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isDisabled,
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isLoginWallEnabled,
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isAuthenticated,
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languageModels,
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selectedSearchScopes,
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searchContexts,
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}: ChatBoxProps) => {
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return [];
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}).flat(),
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});
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const { selectedLanguageModel } = useSelectedLanguageModel({
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languageModels,
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});
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const { selectedLanguageModel } = useSelectedLanguageModel();
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const { toast } = useToast();
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const isAskEnabled = useHasEntitlement('ask');
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const [isLoginDialogOpen, setIsLoginDialogOpen] = useState<boolean>(false);

‎packages/web/src/features/chat/components/chatBox/chatBoxToolbar.tsx‎

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@@ -34,9 +34,7 @@ export const ChatBoxToolbar = ({
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onDisabledMcpServerIdsChange,
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isAuthenticated,
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}: ChatBoxToolbarProps) => {
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const { selectedLanguageModel, setSelectedLanguageModel } = useSelectedLanguageModel({
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languageModels,
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});
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const { selectedLanguageModel, setSelectedLanguageModel } = useSelectedLanguageModel();
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return (
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<>

‎packages/web/src/features/chat/languageModelContext.tsx‎

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'use client';
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import { createContext, useEffect, useMemo, type ReactNode } from "react";
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import { useLocalStorage } from "usehooks-ts";
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import { LanguageModelInfo } from "./types";
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import { getLanguageModelKey } from "./utils";
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export interface SelectedLanguageModelContextValue {
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languageModels: LanguageModelInfo[];
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selectedLanguageModel: LanguageModelInfo | undefined;
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setSelectedLanguageModel: (model: LanguageModelInfo | undefined) => void;
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}
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export const SelectedLanguageModelContext = createContext<SelectedLanguageModelContextValue | null>(null);
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interface LanguageModelProviderProps {
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languageModels: LanguageModelInfo[];
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children: ReactNode;
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}
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// Single owner of the selected-language-model state. Mounted once (in the (app)
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// layout), so the selection lives in one place instead of being re-derived by a
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// `useSelectedLanguageModel` hook in every consumer. Previously each consumer
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// ran its own reset effect against the shared "selectedLanguageModel"
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// localStorage key, and because usehooks-ts broadcasts a storage event on every
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// write, those instances re-triggered each other into a rapid write loop when a
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// model was removed.
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export const LanguageModelProvider = ({
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languageModels,
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children,
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}: LanguageModelProviderProps) => {
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const fallbackLanguageModel = languageModels.length > 0 ? languageModels[0] : undefined;
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const [selectedLanguageModel, setSelectedLanguageModel] = useLocalStorage<LanguageModelInfo | undefined>(
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"selectedLanguageModel",
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fallbackLanguageModel,
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{
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initializeWithValue: false,
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}
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);
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// Handle the case where the selected language model is no longer available.
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// Reset to the fallback language model in this case. Only write when the
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// resolved selection actually differs (compared by key, since the stored
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// value is a fresh object reference on every read) — otherwise the effect
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// would re-write on every render.
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useEffect(() => {
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const selectedKey = selectedLanguageModel
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? getLanguageModelKey(selectedLanguageModel)
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: undefined;
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const isSelectedModelAvailable = selectedKey !== undefined && languageModels.some(
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(model) => getLanguageModelKey(model) === selectedKey
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);
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if (isSelectedModelAvailable) {
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return;
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}
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const fallbackKey = fallbackLanguageModel
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? getLanguageModelKey(fallbackLanguageModel)
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: undefined;
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if (fallbackKey !== selectedKey) {
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setSelectedLanguageModel(fallbackLanguageModel);
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}
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}, [
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fallbackLanguageModel,
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languageModels,
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selectedLanguageModel,
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setSelectedLanguageModel,
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]);
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const value = useMemo<SelectedLanguageModelContextValue>(() => ({
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languageModels,
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selectedLanguageModel,
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setSelectedLanguageModel,
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}), [languageModels, selectedLanguageModel, setSelectedLanguageModel]);
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return (
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<SelectedLanguageModelContext.Provider value={value}>
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{children}
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</SelectedLanguageModelContext.Provider>
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);
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};

‎packages/web/src/features/chat/useSelectedLanguageModel.ts‎

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@@ -1,43 +1,17 @@
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'use client';
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import { useLocalStorage } from "usehooks-ts";
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import { LanguageModelInfo } from "./types";
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import { useEffect } from "react";
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import { getLanguageModelKey } from "./utils";
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import { useContext } from "react";
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import { SelectedLanguageModelContext } from "./languageModelContext";
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type Props = {
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languageModels: LanguageModelInfo[];
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}
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export const useSelectedLanguageModel = ({
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languageModels,
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}: Props) => {
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const fallbackLanguageModel = languageModels.length > 0 ? languageModels[0] : undefined;
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const [selectedLanguageModel, setSelectedLanguageModel] = useLocalStorage<LanguageModelInfo | undefined>(
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"selectedLanguageModel",
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fallbackLanguageModel,
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{
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initializeWithValue: false,
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}
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);
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// Handle the case where the selected language model is no longer
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// available. Reset to the fallback language model in this case.
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useEffect(() => {
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if (!selectedLanguageModel || !languageModels.find(
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(model) => getLanguageModelKey(model) === getLanguageModelKey(selectedLanguageModel)
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)) {
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setSelectedLanguageModel(fallbackLanguageModel);
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}
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}, [
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fallbackLanguageModel,
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languageModels,
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selectedLanguageModel,
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setSelectedLanguageModel,
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]);
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export const useSelectedLanguageModel = () => {
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const context = useContext(SelectedLanguageModelContext);
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if (!context) {
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throw new Error("useSelectedLanguageModel must be used within a LanguageModelProvider");
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}
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const { selectedLanguageModel, setSelectedLanguageModel } = context;
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return {
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selectedLanguageModel,
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setSelectedLanguageModel,
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};
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}
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};

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