feat(site): replace Agent chat textarea with Lexical editor#22449
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feat(site): replace Agent chat textarea with Lexical editor#22449
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Replace the plain <TextareaAutosize> in the Agent chat input with a Lexical-based editor component, matching the pattern used in coder/blink. This gives us a content-editable surface with proper keyboard command handling, paste sanitization, and an imperative ref API (insertText, clear, focus, getValue). The new ChatMessageInput component: - Uses Lexical as the editor engine (plain-text mode, formatting disabled) - Enter submits, Shift+Enter inserts newline - Strips rich-text formatting on paste - Supports undo/redo via HistoryPlugin - Exposes imperative ref for programmatic text manipulation This lays the groundwork for future enhancements like ghost text autocomplete, @-mentions, slash commands, and inline decorators. Parent components (AgentDetail, AgentsPage) updated from controlled value/onChange to the ref-based pattern.
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March 1, 2026 02:48
ValueSyncPlugin seeded content in a useEffect, making it async. In Chromatic, the Send button click could fire before the editor had flushed the update, so getValue() returned empty string. Move initial value seeding into initialConfig.editorState which runs synchronously during LexicalComposer mount.
…in story The editor.focus() callback runs via Lexical's $onUpdate() deferred mechanism, which executes outside of editor.update()/read() context. Calling $getRoot() there threw 'Unable to find an active editor state'. Fix: wrap the focus callback body in editor.update(). Also restore ValueSyncPlugin for initial value seeding (editorState config approach had the same issue), and update the story to wait for the editor text to render before clicking Send.
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Summary
Replaces the plain
<TextareaAutosize>in the Agent chat input (AgentChatInput) with a Lexical-based editor component, matching the pattern used in coder/blink.What changed
New component:
ChatMessageInputsite/src/components/ChatMessageInput/ChatMessageInput.tsxA Lexical-powered text input that behaves as a plain-text editor with:
insertText(),clear(),focus(),getValue()Updated components
AgentChatInput.tsx— Swapped<TextareaAutosize>for<ChatMessageInput>. Moved from controlledvalue/onChangeto ref-based pattern withinitialValue/onContentChange.AgentDetail.tsx— Updated to useuseReffor input value tracking andeditorInitialValuestate for editor resets (edit/cancel flows).AgentsPage.tsx— Updated to useuseRef+initialValuepattern.AgentChatInput.stories.tsx— Updated prop names.Why Lexical?
This lays the groundwork for features that a native
<textarea>can't support:No adornments are added in this PR — it's a drop-in replacement that matches existing behavior.