feat(workbench): sync file changes back to webcontainer (#5)

packages/bolt/app/components/chat/Chat.client.tsx

@@ -1,6 +1,7 @@
 import { useChat } from 'ai/react';
 import { useAnimate } from 'framer-motion';
 import { useEffect, useRef, useState } from 'react';
+import { ToastContainer, cssTransition } from 'react-toastify';
 import { useMessageParser, usePromptEnhancer, useSnapScroll } from '../../lib/hooks';
 import { chatStore } from '../../lib/stores/chat';
 import { workbenchStore } from '../../lib/stores/workbench';
@@ -8,6 +9,11 @@ import { cubicEasingFn } from '../../utils/easings';
 import { createScopedLogger } from '../../utils/logger';
 import { BaseChat } from './BaseChat';
 
+const toastAnimation = cssTransition({
+  enter: 'animated fadeInRight',
+  exit: 'animated fadeOutRight',
+});
+
 const logger = createScopedLogger('Chat');
 
 export function Chat() {
@@ -90,6 +96,7 @@ export function Chat() {
   const [messageRef, scrollRef] = useSnapScroll();
 
   return (
+    <>
       <BaseChat
         ref={animationScope}
         textareaRef={textareaRef}
@@ -119,6 +126,8 @@ export function Chat() {
             scrollTextArea();
           });
         }}
-    ></BaseChat>
+      />
+      <ToastContainer position="bottom-right" stacked={true} pauseOnFocusLoss={true} transition={toastAnimation} />
+    </>
   );
 }

packages/bolt/app/components/editor/codemirror/CodeMirrorEditor.tsx

@@ -2,7 +2,7 @@ import { acceptCompletion, autocompletion, closeBrackets } from '@codemirror/aut
 import { defaultKeymap, history, historyKeymap } from '@codemirror/commands';
 import { bracketMatching, foldGutter, indentOnInput, indentUnit } from '@codemirror/language';
 import { searchKeymap } from '@codemirror/search';
-import { Compartment, EditorSelection, EditorState, type Extension } from '@codemirror/state';
+import { Compartment, EditorSelection, EditorState, StateEffect, StateField, type Extension } from '@codemirror/state';
 import {
   EditorView,
   drawSelection,
@@ -27,8 +27,6 @@ const logger = createScopedLogger('CodeMirrorEditor');
 
 export interface EditorDocument {
   value: string | Uint8Array;
-  previousValue?: string | Uint8Array;
-  commitPending: boolean;
   filePath: string;
   scroll?: ScrollPosition;
 }
@@ -54,6 +52,7 @@ export interface EditorUpdate {
 
 export type OnChangeCallback = (update: EditorUpdate) => void;
 export type OnScrollCallback = (position: ScrollPosition) => void;
+export type OnSaveCallback = () => void;
 
 interface Props {
   theme: Theme;
@@ -65,12 +64,30 @@ interface Props {
   autoFocusOnDocumentChange?: boolean;
   onChange?: OnChangeCallback;
   onScroll?: OnScrollCallback;
+  onSave?: OnSaveCallback;
   className?: string;
   settings?: EditorSettings;
 }
 
 type EditorStates = Map<string, EditorState>;
 
+const editableStateEffect = StateEffect.define<boolean>();
+
+const editableStateField = StateField.define<boolean>({
+  create() {
+    return true;
+  },
+  update(value, transaction) {
+    for (const effect of transaction.effects) {
+      if (effect.is(editableStateEffect)) {
+        return effect.value;
+      }
+    }
+
+    return value;
+  },
+});
+
 export const CodeMirrorEditor = memo(
   ({
     id,
@@ -81,15 +98,14 @@ export const CodeMirrorEditor = memo(
     editable = true,
     onScroll,
     onChange,
+    onSave,
     theme,
     settings,
     className = '',
   }: Props) => {
-    renderLogger.debug('CodeMirrorEditor');
+    renderLogger.trace('CodeMirrorEditor');
 
     const [languageCompartment] = useState(new Compartment());
-    const [readOnlyCompartment] = useState(new Compartment());
-    const [editableCompartment] = useState(new Compartment());
 
     const containerRef = useRef<HTMLDivElement | null>(null);
     const viewRef = useRef<EditorView>();
@@ -98,14 +114,21 @@ export const CodeMirrorEditor = memo(
     const editorStatesRef = useRef<EditorStates>();
     const onScrollRef = useRef(onScroll);
     const onChangeRef = useRef(onChange);
+    const onSaveRef = useRef(onSave);
 
     const isBinaryFile = doc?.value instanceof Uint8Array;
 
+    /**
+     * This effect is used to avoid side effects directly in the render function
+     * and instead the refs are updated after each render.
+     */
+    useEffect(() => {
       onScrollRef.current = onScroll;
       onChangeRef.current = onChange;
-
+      onSaveRef.current = onSave;
       docRef.current = doc;
       themeRef.current = theme;
+    });
 
     useEffect(() => {
       const onUpdate = debounce((update: EditorUpdate) => {
@@ -164,10 +187,8 @@ export const CodeMirrorEditor = memo(
       const theme = themeRef.current!;
 
       if (!doc) {
-        const state = newEditorState('', theme, settings, onScrollRef, debounceScroll, [
+        const state = newEditorState('', theme, settings, onScrollRef, debounceScroll, onSaveRef, [
           languageCompartment.of([]),
-          readOnlyCompartment.of([]),
-          editableCompartment.of([]),
         ]);
 
         view.setState(state);
@@ -188,10 +209,8 @@ export const CodeMirrorEditor = memo(
       let state = editorStates.get(doc.filePath);
 
       if (!state) {
-        state = newEditorState(doc.value, theme, settings, onScrollRef, debounceScroll, [
+        state = newEditorState(doc.value, theme, settings, onScrollRef, debounceScroll, onSaveRef, [
           languageCompartment.of([]),
-          readOnlyCompartment.of([EditorState.readOnly.of(!editable)]),
-          editableCompartment.of([EditorView.editable.of(editable)]),
         ]);
 
         editorStates.set(doc.filePath, state);
@@ -204,8 +223,6 @@ export const CodeMirrorEditor = memo(
         theme,
         editable,
         languageCompartment,
-        readOnlyCompartment,
-        editableCompartment,
         autoFocusOnDocumentChange,
         doc as TextEditorDocument,
       );
@@ -230,20 +247,20 @@ function newEditorState(
   settings: EditorSettings | undefined,
   onScrollRef: MutableRefObject<OnScrollCallback | undefined>,
   debounceScroll: number,
+  onFileSaveRef: MutableRefObject<OnSaveCallback | undefined>,
   extensions: Extension[],
 ) {
   return EditorState.create({
     doc: content,
     extensions: [
       EditorView.domEventHandlers({
-        scroll: debounce((_event, view) => {
+        scroll: debounce((event, view) => {
+          if (event.target !== view.scrollDOM) {
+            return;
+          }
+
           onScrollRef.current?.({ left: view.scrollDOM.scrollLeft, top: view.scrollDOM.scrollTop });
         }, debounceScroll),
-        keydown: (event) => {
-          if (event.code === 'KeyS' && (event.ctrlKey || event.metaKey)) {
-            event.preventDefault();
-          }
-        },
       }),
       getTheme(theme, settings),
       history(),
@@ -252,6 +269,14 @@ function newEditorState(
         ...historyKeymap,
         ...searchKeymap,
         { key: 'Tab', run: acceptCompletion },
+        {
+          key: 'Mod-s',
+          preventDefault: true,
+          run: () => {
+            onFileSaveRef.current?.();
+            return true;
+          },
+        },
         indentKeyBinding,
       ]),
       indentUnit.of('\t'),
@@ -266,6 +291,9 @@ function newEditorState(
       bracketMatching(),
       EditorState.tabSize.of(settings?.tabSize ?? 2),
       indentOnInput(),
+      editableStateField,
+      EditorState.readOnly.from(editableStateField, (editable) => !editable),
+      EditorView.editable.from(editableStateField, (editable) => editable),
       highlightActiveLineGutter(),
       highlightActiveLine(),
       foldGutter({
@@ -300,8 +328,6 @@ function setEditorDocument(
   theme: Theme,
   editable: boolean,
   languageCompartment: Compartment,
-  readOnlyCompartment: Compartment,
-  editableCompartment: Compartment,
   autoFocus: boolean,
   doc: TextEditorDocument,
 ) {
@@ -317,10 +343,7 @@ function setEditorDocument(
   }
 
   view.dispatch({
-    effects: [
+    effects: [editableStateEffect.of(editable)],
-      readOnlyCompartment.reconfigure([EditorState.readOnly.of(!editable)]),
-      editableCompartment.reconfigure([EditorView.editable.of(editable)]),
-    ],
   });
 
   getLanguage(doc.filePath).then((languageSupport) => {
@@ -340,7 +363,7 @@ function setEditorDocument(
 
       const needsScrolling = currentLeft !== newLeft || currentTop !== newTop;
 
-      if (autoFocus) {
+      if (autoFocus && editable) {
         if (needsScrolling) {
           // we have to wait until the scroll position was changed before we can set the focus
           view.scrollDOM.addEventListener(

packages/bolt/app/components/editor/codemirror/cm-theme.ts

@@ -38,6 +38,9 @@ function getEditorTheme(settings: EditorSettings) {
     },
     '.cm-scroller': {
       lineHeight: '1.5',
+      '&:focus-visible': {
+        outline: 'none',
+      },
     },
     '.cm-line': {
       padding: '0 0 0 4px',

packages/bolt/app/components/ui/PanelHeaderButton.tsx

@@ -0,0 +1,36 @@
+import { memo } from 'react';
+import { classNames } from '../../utils/classNames';
+
+interface PanelHeaderButtonProps {
+  className?: string;
+  disabledClassName?: string;
+  disabled?: boolean;
+  children: string | JSX.Element | Array<JSX.Element | string>;
+  onClick?: (event: React.MouseEvent<HTMLButtonElement, MouseEvent>) => void;
+}
+
+export const PanelHeaderButton = memo(
+  ({ className, disabledClassName, disabled = false, children, onClick }: PanelHeaderButtonProps) => {
+    return (
+      <button
+        className={classNames(
+          'flex items-center gap-1.5 px-1.5 rounded-lg py-0.5 bg-transparent hover:bg-white disabled:cursor-not-allowed',
+          {
+            [classNames('opacity-30', disabledClassName)]: disabled,
+          },
+          className,
+        )}
+        disabled={disabled}
+        onClick={(event) => {
+          if (disabled) {
+            return;
+          }
+
+          onClick?.(event);
+        }}
+      >
+        {children}
+      </button>
+    );
+  },
+);

packages/bolt/app/components/workbench/EditorPanel.tsx

@@ -1,5 +1,5 @@
 import { useStore } from '@nanostores/react';
-import { memo } from 'react';
+import { memo, useMemo } from 'react';
 import { Panel, PanelGroup, PanelResizeHandle } from 'react-resizable-panels';
 import type { FileMap } from '../../lib/stores/files';
 import { themeStore } from '../../lib/stores/theme';
@@ -8,43 +8,107 @@ import { isMobile } from '../../utils/mobile';
 import {
   CodeMirrorEditor,
   type EditorDocument,
+  type EditorSettings,
   type OnChangeCallback as OnEditorChange,
+  type OnSaveCallback as OnEditorSave,
   type OnScrollCallback as OnEditorScroll,
 } from '../editor/codemirror/CodeMirrorEditor';
+import { PanelHeaderButton } from '../ui/PanelHeaderButton';
 import { FileTreePanel } from './FileTreePanel';
 
 interface EditorPanelProps {
   files?: FileMap;
+  unsavedFiles?: Set<string>;
   editorDocument?: EditorDocument;
   selectedFile?: string | undefined;
   isStreaming?: boolean;
   onEditorChange?: OnEditorChange;
   onEditorScroll?: OnEditorScroll;
   onFileSelect?: (value?: string) => void;
+  onFileSave?: OnEditorSave;
+  onFileReset?: () => void;
 }
 
+const editorSettings: EditorSettings = { tabSize: 2 };
+
 export const EditorPanel = memo(
-  ({ files, editorDocument, selectedFile, onFileSelect, onEditorChange, onEditorScroll }: EditorPanelProps) => {
+  ({
+    files,
+    unsavedFiles,
+    editorDocument,
+    selectedFile,
+    isStreaming,
+    onFileSelect,
+    onEditorChange,
+    onEditorScroll,
+    onFileSave,
+    onFileReset,
+  }: EditorPanelProps) => {
     renderLogger.trace('EditorPanel');
 
     const theme = useStore(themeStore);
 
+    const activeFile = useMemo(() => {
+      if (!editorDocument) {
+        return '';
+      }
+
+      return editorDocument.filePath.split('/').at(-1);
+    }, [editorDocument]);
+
+    const activeFileUnsaved = useMemo(() => {
+      return editorDocument !== undefined && unsavedFiles?.has(editorDocument.filePath);
+    }, [editorDocument, unsavedFiles]);
+
     return (
       <PanelGroup direction="horizontal">
-        <Panel defaultSize={25} minSize={10} collapsible={true}>
+        <Panel className="flex flex-col" defaultSize={25} minSize={10} collapsible={true}>
-          <FileTreePanel files={files} selectedFile={selectedFile} onFileSelect={onFileSelect} />
+          <div className="border-r h-full">
+            <div className="flex items-center gap-2 bg-gray-50 border-b px-4 py-1 min-h-[34px]">
+              <div className="i-ph:tree-structure-duotone shrink-0" />
+              Files
+            </div>
+            <FileTreePanel
+              files={files}
+              unsavedFiles={unsavedFiles}
+              selectedFile={selectedFile}
+              onFileSelect={onFileSelect}
+            />
+          </div>
         </Panel>
         <PanelResizeHandle />
-        <Panel defaultSize={75} minSize={20}>
+        <Panel className="flex flex-col" defaultSize={75} minSize={20}>
+          <div className="flex items-center gap-2 bg-gray-50 border-b px-4 py-1 min-h-[34px] text-sm">
+            {activeFile && (
+              <div className="flex items-center flex-1">
+                {activeFile} {isStreaming && <span className="text-xs ml-1 font-semibold">(read-only)</span>}
+                {activeFileUnsaved && (
+                  <div className="flex gap-1 ml-auto -mr-1.5">
+                    <PanelHeaderButton onClick={onFileSave}>
+                      <div className="i-ph:floppy-disk-duotone" />
+                      Save
+                    </PanelHeaderButton>
+                    <PanelHeaderButton onClick={onFileReset}>
+                      <div className="i-ph:clock-counter-clockwise-duotone" />
+                      Reset
+                    </PanelHeaderButton>
+                  </div>
+                )}
+              </div>
+            )}
+          </div>
+          <div className="h-full flex-1 overflow-hidden">
             <CodeMirrorEditor
               theme={theme}
-            editable={true}
+              editable={!isStreaming && editorDocument !== undefined}
-            settings={{ tabSize: 2 }}
+              settings={editorSettings}
               doc={editorDocument}
               autoFocusOnDocumentChange={!isMobile()}
               onScroll={onEditorScroll}
               onChange={onEditorChange}
+              onSave={onFileSave}
             />
+          </div>
         </Panel>
       </PanelGroup>
     );

packages/bolt/app/components/workbench/FileTree.tsx

@@ -12,19 +12,19 @@ interface Props {
   onFileSelect?: (filePath: string) => void;
   rootFolder?: string;
   hiddenFiles?: Array<string | RegExp>;
+  unsavedFiles?: Set<string>;
   className?: string;
 }
 
 export const FileTree = memo(
-  ({ files = {}, onFileSelect, selectedFile, rootFolder, hiddenFiles, className }: Props) => {
+  ({ files = {}, onFileSelect, selectedFile, rootFolder, hiddenFiles, className, unsavedFiles }: Props) => {
     renderLogger.trace('FileTree');
 
     const computedHiddenFiles = useMemo(() => [...DEFAULT_HIDDEN_FILES, ...(hiddenFiles ?? [])], [hiddenFiles]);
 
-    const fileList = useMemo(
+    const fileList = useMemo(() => {
-      () => buildFileList(files, rootFolder, computedHiddenFiles),
+      return buildFileList(files, rootFolder, computedHiddenFiles);
-      [files, rootFolder, computedHiddenFiles],
+    }, [files, rootFolder, computedHiddenFiles]);
-    );
 
     const [collapsedFolders, setCollapsedFolders] = useState(() => new Set<string>());
 
@@ -95,6 +95,7 @@ export const FileTree = memo(
                   key={fileOrFolder.id}
                   selected={selectedFile === fileOrFolder.fullPath}
                   file={fileOrFolder}
+                  unsavedChanges={unsavedFiles?.has(fileOrFolder.fullPath)}
                   onClick={() => {
                     onFileSelect?.(fileOrFolder.fullPath);
                   }}
@@ -134,7 +135,7 @@ interface FolderProps {
 function Folder({ folder: { depth, name }, collapsed, onClick }: FolderProps) {
   return (
     <NodeButton
-      className="group bg-white hover:bg-gray-100 text-md"
+      className="group bg-white hover:bg-gray-50 text-md"
       depth={depth}
       iconClasses={classNames({
         'i-ph:caret-right scale-98': collapsed,
@@ -150,10 +151,11 @@ function Folder({ folder: { depth, name }, collapsed, onClick }: FolderProps) {
 interface FileProps {
   file: FileNode;
   selected: boolean;
+  unsavedChanges?: boolean;
   onClick: () => void;
 }
 
-function File({ file: { depth, name }, onClick, selected }: FileProps) {
+function File({ file: { depth, name }, onClick, selected, unsavedChanges = false }: FileProps) {
   return (
     <NodeButton
       className={classNames('group', {
@@ -166,7 +168,10 @@ function File({ file: { depth, name }, onClick, selected }: FileProps) {
       })}
       onClick={onClick}
     >
-      {name}
+      <div className="flex items-center">
+        <div className="flex-1 truncate pr-2">{name}</div>
+        {unsavedChanges && <span className="i-ph:circle-fill scale-68 shrink-0 text-warning-400" />}
+      </div>
     </NodeButton>
   );
 }
@@ -187,7 +192,7 @@ function NodeButton({ depth, iconClasses, onClick, className, children }: Button
       onClick={() => onClick?.()}
     >
       <div className={classNames('scale-120 shrink-0', iconClasses)}></div>
-      <span className="whitespace-nowrap">{children}</span>
+      <div className="truncate w-full text-left">{children}</div>
     </button>
   );
 }

packages/bolt/app/components/workbench/FileTreePanel.tsx

@@ -7,15 +7,22 @@ import { FileTree } from './FileTree';
 interface FileTreePanelProps {
   files?: FileMap;
   selectedFile?: string;
+  unsavedFiles?: Set<string>;
   onFileSelect?: (value?: string) => void;
 }
 
-export const FileTreePanel = memo(({ files, selectedFile, onFileSelect }: FileTreePanelProps) => {
+export const FileTreePanel = memo(({ files, unsavedFiles, selectedFile, onFileSelect }: FileTreePanelProps) => {
   renderLogger.trace('FileTreePanel');
 
   return (
-    <div className="border-r h-full">
+    <div className="h-full">
-      <FileTree files={files} rootFolder={WORK_DIR} selectedFile={selectedFile} onFileSelect={onFileSelect} />
+      <FileTree
+        files={files}
+        unsavedFiles={unsavedFiles}
+        rootFolder={WORK_DIR}
+        selectedFile={selectedFile}
+        onFileSelect={onFileSelect}
+      />
     </div>
   );
 });

packages/bolt/app/components/workbench/Workbench.client.tsx

@@ -2,12 +2,13 @@ import { useStore } from '@nanostores/react';
 import { AnimatePresence, motion, type Variants } from 'framer-motion';
 import { memo, useCallback, useEffect } from 'react';
 import { Panel, PanelGroup, PanelResizeHandle } from 'react-resizable-panels';
+import { toast } from 'react-toastify';
 import { workbenchStore } from '../../lib/stores/workbench';
 import { cubicEasingFn } from '../../utils/easings';
 import { renderLogger } from '../../utils/logger';
-import type {
+import {
-  OnChangeCallback as OnEditorChange,
+  type OnChangeCallback as OnEditorChange,
-  OnScrollCallback as OnEditorScroll,
+  type OnScrollCallback as OnEditorScroll,
 } from '../editor/codemirror/CodeMirrorEditor';
 import { IconButton } from '../ui/IconButton';
 import { EditorPanel } from './EditorPanel';
@@ -41,6 +42,7 @@ export const Workbench = memo(({ chatStarted, isStreaming }: WorkspaceProps) =>
   const showWorkbench = useStore(workbenchStore.showWorkbench);
   const selectedFile = useStore(workbenchStore.selectedFile);
   const currentDocument = useStore(workbenchStore.currentDocument);
+  const unsavedFiles = useStore(workbenchStore.unsavedFiles);
 
   const files = useStore(workbenchStore.files);
 
@@ -60,6 +62,16 @@ export const Workbench = memo(({ chatStarted, isStreaming }: WorkspaceProps) =>
     workbenchStore.setSelectedFile(filePath);
   }, []);
 
+  const onFileSave = useCallback(() => {
+    workbenchStore.saveCurrentDocument().catch(() => {
+      toast.error('Failed to update file content');
+    });
+  }, []);
+
+  const onFileReset = useCallback(() => {
+    workbenchStore.resetCurrentDocument();
+  }, []);
+
   return (
     chatStarted && (
       <AnimatePresence>
@@ -70,7 +82,7 @@ export const Workbench = memo(({ chatStarted, isStreaming }: WorkspaceProps) =>
                 <div className="px-3 py-2 border-b border-gray-200">
                   <IconButton
                     icon="i-ph:x-circle"
-                    className="ml-auto"
+                    className="ml-auto -mr-1"
                     size="xxl"
                     onClick={() => {
                       workbenchStore.showWorkbench.set(false);
@@ -85,9 +97,12 @@ export const Workbench = memo(({ chatStarted, isStreaming }: WorkspaceProps) =>
                         isStreaming={isStreaming}
                         selectedFile={selectedFile}
                         files={files}
+                        unsavedFiles={unsavedFiles}
                         onFileSelect={onFileSelect}
                         onEditorScroll={onEditorScroll}
                         onEditorChange={onEditorChange}
+                        onFileSave={onFileSave}
+                        onFileReset={onFileReset}
                       />
                     </Panel>
                     <PanelResizeHandle />

packages/bolt/app/lib/runtime/action-runner.ts

@@ -167,7 +167,7 @@ export class ActionRunner {
         await webcontainer.fs.mkdir(folder, { recursive: true });
         logger.debug('Created folder', folder);
       } catch (error) {
-        logger.error('Failed to create folder\n', error);
+        logger.error('Failed to create folder\n\n', error);
       }
     }
 
@@ -175,7 +175,7 @@ export class ActionRunner {
       await webcontainer.fs.writeFile(action.filePath, action.content);
       logger.debug(`File written ${action.filePath}`);
     } catch (error) {
-      logger.error('Failed to write file\n', error);
+      logger.error('Failed to write file\n\n', error);
     }
   }
 

packages/bolt/app/lib/stores/editor.ts

@@ -1,15 +1,16 @@
-import type { WebContainer } from '@webcontainer/api';
+import { atom, computed, map, type MapStore, type WritableAtom } from 'nanostores';
-import { atom, computed, map } from 'nanostores';
 import type { EditorDocument, ScrollPosition } from '../../components/editor/codemirror/CodeMirrorEditor';
-import type { FileMap } from './files';
+import type { FileMap, FilesStore } from './files';
 
 export type EditorDocuments = Record<string, EditorDocument>;
 
-export class EditorStore {
+type SelectedFile = WritableAtom<string | undefined>;
-  #webcontainer: Promise<WebContainer>;
 
-  selectedFile = atom<string | undefined>();
+export class EditorStore {
-  documents = map<EditorDocuments>({});
+  #filesStore: FilesStore;
+
+  selectedFile: SelectedFile = import.meta.hot?.data.selectedFile ?? atom<string | undefined>();
+  documents: MapStore<EditorDocuments> = import.meta.hot?.data.documents ?? map<EditorDocuments>({});
 
   currentDocument = computed([this.documents, this.selectedFile], (documents, selectedFile) => {
     if (!selectedFile) {
@@ -19,12 +20,13 @@ export class EditorStore {
     return documents[selectedFile];
   });
 
-  constructor(webcontainerPromise: Promise<WebContainer>) {
+  constructor(filesStore: FilesStore) {
-    this.#webcontainer = webcontainerPromise;
+    this.#filesStore = filesStore;
-  }
 
-  commitFileContent(_filePath: string) {
+    if (import.meta.hot) {
-    // TODO
+      import.meta.hot.data.documents = this.documents;
+      import.meta.hot.data.selectedFile = this.selectedFile;
+    }
   }
 
   setDocuments(files: FileMap) {
@@ -38,13 +40,14 @@ export class EditorStore {
               return undefined;
             }
 
+            const previousDocument = previousDocuments?.[filePath];
+
             return [
               filePath,
               {
                 value: dirent.content,
-                commitPending: false,
                 filePath,
-                scroll: previousDocuments?.[filePath]?.scroll,
+                scroll: previousDocument?.scroll,
               },
             ] as [string, EditorDocument];
           })
@@ -71,26 +74,22 @@ export class EditorStore {
     });
   }
 
-  updateFile(filePath: string, content: string): boolean {
+  updateFile(filePath: string, newContent: string | Uint8Array) {
     const documents = this.documents.get();
     const documentState = documents[filePath];
 
     if (!documentState) {
-      return false;
+      return;
     }
 
     const currentContent = documentState.value;
-    const contentChanged = currentContent !== content;
+    const contentChanged = currentContent !== newContent;
 
     if (contentChanged) {
       this.documents.setKey(filePath, {
         ...documentState,
-        previousValue: !documentState.commitPending ? currentContent : documentState.previousValue,
+        value: newContent,
-        commitPending: documentState.previousValue ? documentState.previousValue !== content : true,
-        value: content,
       });
     }
-
-    return contentChanged;
   }
 }

packages/bolt/app/lib/stores/files.ts

@@ -1,16 +1,20 @@
 import type { PathWatcherEvent, WebContainer } from '@webcontainer/api';
-import { map } from 'nanostores';
+import { map, type MapStore } from 'nanostores';
+import * as nodePath from 'node:path';
 import { bufferWatchEvents } from '../../utils/buffer';
 import { WORK_DIR } from '../../utils/constants';
+import { createScopedLogger } from '../../utils/logger';
+
+const logger = createScopedLogger('FilesStore');
 
 const textDecoder = new TextDecoder('utf8', { fatal: true });
 
-interface File {
+export interface File {
   type: 'file';
-  content: string;
+  content: string | Uint8Array;
 }
 
-interface Folder {
+export interface Folder {
   type: 'folder';
 }
 
@@ -21,14 +25,59 @@ export type FileMap = Record<string, Dirent | undefined>;
 export class FilesStore {
   #webcontainer: Promise<WebContainer>;
 
-  files = map<FileMap>({});
+  /**
+   * Tracks the number of files without folders.
+   */
+  #size = 0;
+
+  files: MapStore<FileMap> = import.meta.hot?.data.files ?? map({});
+
+  get filesCount() {
+    return this.#size;
+  }
 
   constructor(webcontainerPromise: Promise<WebContainer>) {
     this.#webcontainer = webcontainerPromise;
 
+    if (import.meta.hot) {
+      import.meta.hot.data.files = this.files;
+    }
+
     this.#init();
   }
 
+  getFile(filePath: string) {
+    const dirent = this.files.get()[filePath];
+
+    if (dirent?.type !== 'file') {
+      return undefined;
+    }
+
+    return dirent;
+  }
+
+  async saveFile(filePath: string, content: string | Uint8Array) {
+    const webcontainer = await this.#webcontainer;
+
+    try {
+      const relativePath = nodePath.relative(webcontainer.workdir, filePath);
+
+      if (!relativePath) {
+        throw new Error(`EINVAL: invalid file path, write '${relativePath}'`);
+      }
+
+      await webcontainer.fs.writeFile(relativePath, content);
+
+      this.files.setKey(filePath, { type: 'file', content });
+
+      logger.info('File updated');
+    } catch (error) {
+      logger.error('Failed to update file content\n\n', error);
+
+      throw error;
+    }
+  }
+
   async #init() {
     const webcontainer = await this.#webcontainer;
 
@@ -64,10 +113,16 @@ export class FilesStore {
         }
         case 'add_file':
         case 'change': {
+          if (type === 'add_file') {
+            this.#size++;
+          }
+
           this.files.setKey(sanitizedPath, { type: 'file', content: this.#decodeFileContent(buffer) });
+
           break;
         }
         case 'remove_file': {
+          this.#size--;
           this.files.setKey(sanitizedPath, undefined);
           break;
         }

packages/bolt/app/lib/stores/workbench.ts

@@ -21,11 +21,20 @@ type Artifacts = MapStore<Record<string, ArtifactState>>;
 export class WorkbenchStore {
   #previewsStore = new PreviewsStore(webcontainer);
   #filesStore = new FilesStore(webcontainer);
-  #editorStore = new EditorStore(webcontainer);
+  #editorStore = new EditorStore(this.#filesStore);
 
   artifacts: Artifacts = import.meta.hot?.data.artifacts ?? map({});
-
   showWorkbench: WritableAtom<boolean> = import.meta.hot?.data.showWorkbench ?? atom(false);
+  unsavedFiles: WritableAtom<Set<string>> = import.meta.hot?.data.unsavedFiles ?? atom(new Set<string>());
+  modifiedFiles = new Set<string>();
+
+  constructor() {
+    if (import.meta.hot) {
+      import.meta.hot.data.artifacts = this.artifacts;
+      import.meta.hot.data.unsavedFiles = this.unsavedFiles;
+      import.meta.hot.data.showWorkbench = this.showWorkbench;
+    }
+  }
 
   get previews() {
     return this.#previewsStore.previews;
@@ -45,20 +54,53 @@ export class WorkbenchStore {
 
   setDocuments(files: FileMap) {
     this.#editorStore.setDocuments(files);
+
+    if (this.#filesStore.filesCount > 0 && this.currentDocument.get() === undefined) {
+      // we find the first file and select it
+      for (const [filePath, dirent] of Object.entries(files)) {
+        if (dirent?.type === 'file') {
+          this.setSelectedFile(filePath);
+          break;
+        }
+      }
+    }
   }
 
   setShowWorkbench(show: boolean) {
     this.showWorkbench.set(show);
   }
 
-  setCurrentDocumentContent(newContent: string) {
+  setCurrentDocumentContent(newContent: string | Uint8Array) {
     const filePath = this.currentDocument.get()?.filePath;
 
     if (!filePath) {
       return;
     }
 
+    const originalContent = this.#filesStore.getFile(filePath)?.content;
+    const unsavedChanges = originalContent !== undefined && originalContent !== newContent;
+
     this.#editorStore.updateFile(filePath, newContent);
+
+    const currentDocument = this.currentDocument.get();
+
+    if (currentDocument) {
+      const previousUnsavedFiles = this.unsavedFiles.get();
+
+      if (unsavedChanges && previousUnsavedFiles.has(currentDocument.filePath)) {
+        return;
+      }
+
+      const newUnsavedFiles = new Set(previousUnsavedFiles);
+
+      if (unsavedChanges) {
+        newUnsavedFiles.add(currentDocument.filePath);
+      } else {
+        newUnsavedFiles.delete(currentDocument.filePath);
+      }
+
+      this.unsavedFiles.set(newUnsavedFiles);
+    }
   }
 
   setCurrentDocumentScrollPosition(position: ScrollPosition) {
@@ -77,6 +119,40 @@ export class WorkbenchStore {
     this.#editorStore.setSelectedFile(filePath);
   }
 
+  async saveCurrentDocument() {
+    const currentDocument = this.currentDocument.get();
+
+    if (currentDocument === undefined) {
+      return;
+    }
+
+    const { filePath } = currentDocument;
+
+    await this.#filesStore.saveFile(filePath, currentDocument.value);
+
+    const newUnsavedFiles = new Set(this.unsavedFiles.get());
+    newUnsavedFiles.delete(filePath);
+
+    this.unsavedFiles.set(newUnsavedFiles);
+  }
+
+  resetCurrentDocument() {
+    const currentDocument = this.currentDocument.get();
+
+    if (currentDocument === undefined) {
+      return;
+    }
+
+    const { filePath } = currentDocument;
+    const file = this.#filesStore.getFile(filePath);
+
+    if (!file) {
+      return;
+    }
+
+    this.setCurrentDocumentContent(file.content);
+  }
+
   abortAllActions() {
     // TODO: what do we wanna do and how do we wanna recover from this?
   }
@@ -136,8 +212,3 @@ export class WorkbenchStore {
 }
 
 export const workbenchStore = new WorkbenchStore();
-
-if (import.meta.hot) {
-  import.meta.hot.data.artifacts = workbenchStore.artifacts;
-  import.meta.hot.data.showWorkbench = workbenchStore.showWorkbench;
-}

packages/bolt/app/root.tsx

@@ -5,6 +5,7 @@ import tailwindReset from '@unocss/reset/tailwind-compat.css?url';
 import { themeStore } from './lib/stores/theme';
 import { stripIndents } from './utils/stripIndent';
 
+import reactToastifyStyles from 'react-toastify/dist/ReactToastify.css?url';
 import globalStyles from './styles/index.scss?url';
 
 import 'virtual:uno.css';
@@ -17,6 +18,7 @@ export const links: LinksFunction = () => [
   },
   { rel: 'stylesheet', href: tailwindReset },
   { rel: 'stylesheet', href: globalStyles },
+  { rel: 'stylesheet', href: reactToastifyStyles },
   {
     rel: 'preconnect',
     href: 'https://fonts.googleapis.com',

packages/bolt/app/styles/animations.scss

@@ -0,0 +1,36 @@
+.animated {
+  animation-fill-mode: both;
+  animation-duration: var(--animate-duration, 0.2s);
+  animation-timing-function: cubic-bezier(0, 0, 0.2, 1);
+
+  &.fadeInRight {
+    animation-name: fadeInRight;
+  }
+
+  &.fadeOutRight {
+    animation-name: fadeOutRight;
+  }
+}
+
+@keyframes fadeInRight {
+  from {
+    opacity: 0;
+    transform: translate3d(100%, 0, 0);
+  }
+
+  to {
+    opacity: 1;
+    transform: translate3d(0, 0, 0);
+  }
+}
+
+@keyframes fadeOutRight {
+  from {
+    opacity: 1;
+  }
+
+  to {
+    opacity: 0;
+    transform: translate3d(100%, 0, 0);
+  }
+}

packages/bolt/app/styles/index.scss

@@ -1,4 +1,5 @@
 @import './variables.scss';
+@import './animations.scss';
 
 body {
   --at-apply: bg-bolt-elements-app-backgroundColor;

packages/bolt/app/utils/logger.ts

@@ -57,7 +57,21 @@ function log(level: DebugLevel, scope: string | undefined, messages: any[]) {
       styles.push('', scopeStyles);
     }
 
-    console.log(`%c${level.toUpperCase()}${scope ? `%c %c${scope}` : ''}`, ...styles, ...messages);
+    console.log(
+      `%c${level.toUpperCase()}${scope ? `%c %c${scope}` : ''}`,
+      ...styles,
+      messages.reduce((acc, current) => {
+        if (acc.endsWith('\n')) {
+          return acc + current;
+        }
+
+        if (!acc) {
+          return current;
+        }
+
+        return `${acc} ${current}`;
+      }, ''),
+    );
   }
 }
 

packages/bolt/package.json

@@ -50,6 +50,7 @@
     "react-dom": "^18.2.0",
     "react-markdown": "^9.0.1",
     "react-resizable-panels": "^2.0.20",
+    "react-toastify": "^10.0.5",
     "rehype-raw": "^7.0.0",
     "remark-gfm": "^4.0.0",
     "remix-utils": "^7.6.0",

pnpm-lock.yaml

@@ -137,6 +137,9 @@ importers:
       react-resizable-panels:
         specifier: ^2.0.20
         version: 2.0.20(react-dom@18.3.1(react@18.3.1))(react@18.3.1)
+      react-toastify:
+        specifier: ^10.0.5
+        version: 10.0.5(react-dom@18.3.1(react@18.3.1))(react@18.3.1)
       rehype-raw:
         specifier: ^7.0.0
         version: 7.0.0
@@ -2036,6 +2039,10 @@ packages:
     resolution: {integrity: sha512-JQHZ2QMW6l3aH/j6xCqQThY/9OH4D/9ls34cgkUBiEeocRTU04tHfKPBsUK1PqZCUQM7GiA0IIXJSuXHI64Kbg==}
     engines: {node: '>=0.8'}
 
+  clsx@2.1.1:
+    resolution: {integrity: sha512-eYm0QWBtUrBWZWG0d386OGAw16Z995PiOVo2B7bjWSbHedGl5e0ZWaq65kOGgUSNesEIDkB9ISbTg/JK9dhCZA==}
+    engines: {node: '>=6'}
+
   code-red@1.0.4:
     resolution: {integrity: sha512-7qJWqItLA8/VPVlKJlFXU+NBlo/qyfs39aJcuMT/2ere32ZqvF5OSxgdM5xOfJJ7O429gg2HM47y8v9P+9wrNw==}
 
@@ -4085,6 +4092,12 @@ packages:
     peerDependencies:
       react: '>=16.8'
 
+  react-toastify@10.0.5:
+    resolution: {integrity: sha512-mNKt2jBXJg4O7pSdbNUfDdTsK9FIdikfsIE/yUCxbAEXl4HMyJaivrVFcn3Elvt5xvCQYhUZm+hqTIu1UXM3Pw==}
+    peerDependencies:
+      react: '>=18'
+      react-dom: '>=18'
+
   react@18.3.1:
     resolution: {integrity: sha512-wS+hAgJShR0KhEvPJArfuPVN1+Hz1t0Y6n5jLrGQbkb4urgPE/0Rve+1kMB1v/oWgHgm4WIcV+i7F2pTVj+2iQ==}
     engines: {node: '>=0.10.0'}
@@ -7147,6 +7160,8 @@ snapshots:
 
   clone@1.0.4: {}
 
+  clsx@2.1.1: {}
+
   code-red@1.0.4:
     dependencies:
       '@jridgewell/sourcemap-codec': 1.4.15
@@ -9715,6 +9730,12 @@ snapshots:
       '@remix-run/router': 1.17.1
       react: 18.3.1
 
+  react-toastify@10.0.5(react-dom@18.3.1(react@18.3.1))(react@18.3.1):
+    dependencies:
+      clsx: 2.1.1
+      react: 18.3.1
+      react-dom: 18.3.1(react@18.3.1)
+
   react@18.3.1:
     dependencies:
       loose-envify: 1.4.0