Warnings, Underlines, & Hover Information for Issues (#222)

* add warnings

* missed fix for warnings with no errors display

* polish up the UI for warnings/suggestions

* hover info for warnings, errors, suggestions

* remove prod compiler issue

* change infer target on TsServerSuggestionType

packages/api/server/ws.mts

@@ -56,6 +56,7 @@ import {
   CellCreatePayloadSchema,
   TsConfigUpdatePayloadSchema,
   TsConfigUpdatedPayloadSchema,
+  TsServerCellSuggestionsPayloadSchema,
 } from '@srcbook/shared';
 import tsservers from '../tsservers.mjs';
 import { TsServer } from '../tsserver/tsserver.mjs';
@@ -601,6 +602,30 @@ function createTsServer(session: SessionType) {
     });
   });
 
+  tsserver.onSuggestionDiag(async (event) => {
+    const eventBody = event.body;
+
+    // Get most recent session state
+    const session = await findSession(sessionId);
+
+    if (!eventBody || !session) {
+      return;
+    }
+
+    const filename = filenameFromPath(eventBody.file);
+    const cells = session.cells.filter((cell) => cell.type === 'code') as CodeCellType[];
+    const cell = cells.find((c) => c.filename === filename);
+
+    if (!cell) {
+      return;
+    }
+
+    wss.broadcast(`session:${session.id}`, 'tsserver:cell:suggestions', {
+      cellId: cell.id,
+      diagnostics: eventBody.diagnostics.map(normalizeDiagnostic),
+    });
+  });
+
   // Open all code cells in tsserver
   for (const cell of session.cells) {
     if (cell.type === 'code') {
@@ -678,6 +703,7 @@ wss
   .outgoing('ai:generated', AiGeneratedCellPayloadSchema)
   .outgoing('deps:validate:response', DepsValidateResponsePayloadSchema)
   .outgoing('tsserver:cell:diagnostics', TsServerCellDiagnosticsPayloadSchema)
+  .outgoing('tsserver:cell:suggestions', TsServerCellSuggestionsPayloadSchema)
   .outgoing('tsconfig.json:updated', TsConfigUpdatedPayloadSchema);
 
 export default wss;

packages/shared/src/schemas/tsserver.ts

@@ -12,3 +12,11 @@ export const TsServerDiagnosticSchema = z.object({
   start: TsServerLocationSchema,
   end: TsServerLocationSchema,
 });
+
+export const TsServerSuggestionSchema = z.object({
+  code: z.number(),
+  category: z.string(),
+  text: z.string(),
+  start: TsServerLocationSchema,
+  end: TsServerLocationSchema,
+});

packages/shared/src/schemas/websockets.ts

@@ -108,6 +108,11 @@ export const TsServerCellDiagnosticsPayloadSchema = z.object({
   diagnostics: z.array(TsServerDiagnosticSchema),
 });
 
+export const TsServerCellSuggestionsPayloadSchema = z.object({
+  cellId: z.string(),
+  diagnostics: z.array(TsServerDiagnosticSchema),
+});
+
 export const TsConfigUpdatePayloadSchema = z.object({
   sessionId: z.string(),
   source: z.string(),

packages/shared/src/types/tsserver.ts

@@ -1,6 +1,11 @@
 import z from 'zod';
 
-import { TsServerLocationSchema, TsServerDiagnosticSchema } from '../schemas/tsserver.js';
+import {
+  TsServerLocationSchema,
+  TsServerDiagnosticSchema,
+  TsServerSuggestionSchema,
+} from '../schemas/tsserver.js';
 
 export type TsServerLocationType = z.infer<typeof TsServerLocationSchema>;
 export type TsServerDiagnosticType = z.infer<typeof TsServerDiagnosticSchema>;
+export type TsServerSuggestionType = z.infer<typeof TsServerSuggestionSchema>;

packages/shared/src/types/websockets.ts

@@ -21,6 +21,7 @@ import {
   TsConfigUpdatePayloadSchema,
   TsConfigUpdatedPayloadSchema,
   AiFixDiagnosticsPayloadSchema,
+  TsServerCellSuggestionsPayloadSchema,
 } from '../schemas/websockets.js';
 
 export type CellExecPayloadType = z.infer<typeof CellExecPayloadSchema>;
@@ -46,6 +47,9 @@ export type TsServerStopPayloadType = z.infer<typeof TsServerStopPayloadSchema>;
 export type TsServerCellDiagnosticsPayloadType = z.infer<
   typeof TsServerCellDiagnosticsPayloadSchema
 >;
+export type TsServerCellSuggestionsPayloadType = z.infer<
+  typeof TsServerCellSuggestionsPayloadSchema
+>;
 
 export type TsConfigUpdatePayloadType = z.infer<typeof TsConfigUpdatePayloadSchema>;
 export type TsConfigUpdatedPayloadType = z.infer<typeof TsConfigUpdatedPayloadSchema>;

packages/web/package.json

@@ -16,6 +16,7 @@
     "@codemirror/lang-javascript": "^6.2.2",
     "@codemirror/lang-json": "^6.0.1",
     "@codemirror/lang-markdown": "^6.2.5",
+    "@codemirror/lint": "^6.8.1",
     "@codemirror/merge": "^6.6.5",
     "@codemirror/state": "^6.4.1",
     "@lezer/highlight": "^1.2.0",

packages/web/src/clients/websocket/index.ts

@@ -19,6 +19,7 @@ import {
   TsConfigUpdatePayloadSchema,
   TsConfigUpdatedPayloadSchema,
   AiFixDiagnosticsPayloadSchema,
+  TsServerCellSuggestionsPayloadSchema,
 } from '@srcbook/shared';
 import Channel from '@/clients/websocket/channel';
 import WebSocketClient from '@/clients/websocket/client';
@@ -34,6 +35,7 @@ const IncomingSessionEvents = {
   'cell:updated': CellUpdatedPayloadSchema,
   'deps:validate:response': DepsValidateResponsePayloadSchema,
   'tsserver:cell:diagnostics': TsServerCellDiagnosticsPayloadSchema,
+  'tsserver:cell:suggestions': TsServerCellSuggestionsPayloadSchema,
   'ai:generated': AiGeneratedCellPayloadSchema,
   'tsconfig.json:updated': TsConfigUpdatedPayloadSchema,
 };

packages/web/src/components/cell-output.tsx

@@ -27,19 +27,24 @@ export function CellOutput({
   fullscreen,
   setFullscreen,
 }: PropsType) {
-  const { getOutput, clearOutput, getTsServerDiagnostics } = useCells();
+  const { getOutput, clearOutput, getTsServerDiagnostics, getTsServerSuggestions } = useCells();
 
-  const [activeTab, setActiveTab] = useState<'stdout' | 'stderr' | 'problems'>('stdout');
+  const [activeTab, setActiveTab] = useState<'stdout' | 'stderr' | 'problems' | 'warnings'>(
+    'stdout',
+  );
 
   const stdout = getOutput(cell.id, 'stdout') as StdoutOutputType[];
   const stderr = getOutput(cell.id, 'stderr') as StderrOutputType[];
   const diagnostics = getTsServerDiagnostics(cell.id);
+  const suggestions = getTsServerSuggestions(cell.id);
 
   return (
     <div className={cn('font-mono text-sm', fullscreen && !show && 'border-b')}>
       <Tabs
         value={activeTab}
-        onValueChange={(value) => setActiveTab(value as 'stdout' | 'stderr' | 'problems')}
+        onValueChange={(value) =>
+          setActiveTab(value as 'stdout' | 'stderr' | 'problems' | 'warnings')
+        }
         defaultValue="stdout"
       >
         <div
@@ -94,6 +99,24 @@ export function CellOutput({
                 )}
               </TabsTrigger>
             )}
+            {cell.type === 'code' && cell.language === 'typescript' && (
+              <TabsTrigger
+                onClick={() => setShow(true)}
+                value="warnings"
+                className={cn(
+                  !show &&
+                    'border-transparent data-[state=active]:border-transparent data-[state=active]:text-tertiary-foreground mb-0',
+                )}
+              >
+                {suggestions.length > 0 ? (
+                  <>
+                    warnings <span className="text-sb-yellow-50">({suggestions.length})</span>
+                  </>
+                ) : (
+                  'warnings'
+                )}
+              </TabsTrigger>
+            )}
           </TabsList>
           <div className="flex items-center gap-6">
             <button
@@ -106,8 +129,13 @@ export function CellOutput({
             </button>
             <button
               className="hover:text-secondary-hover disabled:pointer-events-none disabled:opacity-50"
-              disabled={activeTab === 'problems'}
-              onClick={() => clearOutput(cell.id, activeTab === 'problems' ? undefined : activeTab)}
+              disabled={activeTab === 'problems' || activeTab === 'warnings'}
+              onClick={() =>
+                clearOutput(
+                  cell.id,
+                  activeTab === 'problems' || activeTab === 'warnings' ? undefined : activeTab,
+                )
+              }
             >
               <Ban size={16} />
             </button>
@@ -138,6 +166,15 @@ export function CellOutput({
                 />
               </TabsContent>
             )}
+            {cell.type === 'code' && cell.language === 'typescript' && (
+              <TabsContent value="warnings" className="mt-0">
+                <TsServerSuggestions
+                  suggestions={suggestions}
+                  fixSuggestions={fixDiagnostics} // fixDiagnostics works for both diagnostics and suggestions
+                  cellMode={cellMode}
+                />
+              </TabsContent>
+            )}
           </div>
         )}
       </Tabs>
@@ -203,3 +240,34 @@ function TsServerDiagnostics({
     </div>
   );
 }
+
+function TsServerSuggestions({
+  suggestions,
+  fixSuggestions,
+  cellMode,
+}: {
+  suggestions: TsServerDiagnosticType[];
+  fixSuggestions: (suggestions: string) => void;
+  cellMode: 'off' | 'generating' | 'reviewing' | 'prompting' | 'fixing';
+}) {
+  const { aiEnabled } = useSettings();
+  const formattedSuggestions = suggestions.map(formatDiagnostic).join('\n');
+  return suggestions.length === 0 ? (
+    <div className="italic text-center text-muted-foreground">No warnings or suggestions</div>
+  ) : (
+    <div className="flex flex-col w-full">
+      <p>{formattedSuggestions}</p>
+      {aiEnabled && cellMode !== 'fixing' && (
+        <Button
+          variant="ai"
+          className="self-start flex items-center gap-2 px-2.5 py-2 font-sans h-7 mt-3"
+          onClick={() => fixSuggestions(formattedSuggestions)}
+          disabled={cellMode === 'generating'}
+        >
+          <Sparkles size={16} />
+          <p>Fix with AI</p>
+        </Button>
+      )}
+    </div>
+  );
+}

packages/web/src/components/cells/code.tsx

@@ -26,6 +26,7 @@ import {
   CodeCellUpdateAttrsType,
   CellErrorPayloadType,
   AiGeneratedCellPayloadType,
+  TsServerDiagnosticType,
 } from '@srcbook/shared';
 import { useSettings } from '@/components/use-settings';
 import { cn } from '@/lib/utils';
@@ -41,6 +42,7 @@ import { useDebouncedCallback } from 'use-debounce';
 import { EditorView } from 'codemirror';
 import { EditorState } from '@codemirror/state';
 import { unifiedMergeView } from '@codemirror/merge';
+import { type Diagnostic, linter } from '@codemirror/lint';
 
 const DEBOUNCE_DELAY = 500;
 type CellModeType = 'off' | 'generating' | 'reviewing' | 'prompting' | 'fixing';
@@ -543,6 +545,84 @@ function Header(props: {
   );
 }
 
+function tsCategoryToSeverity(
+  diagnostic: Pick<TsServerDiagnosticType, 'category' | 'code'>,
+): Diagnostic['severity'] {
+  if (diagnostic.code === 7027) {
+    return 'warning';
+  }
+  // force resolve types with fallback
+  switch (diagnostic.category) {
+    case 'error':
+      return 'error';
+    case 'warning':
+      return 'warning';
+    case 'suggestion':
+      return 'warning';
+    case 'info':
+      return 'info';
+    default:
+      return 'info';
+  }
+}
+
+function isDiagnosticWithLocation(
+  diagnostic: TsServerDiagnosticType,
+): diagnostic is TsServerDiagnosticType {
+  return !!(typeof diagnostic.start.line === 'number' && typeof diagnostic.end.line === 'number');
+}
+
+function tsDiagnosticMessage(diagnostic: TsServerDiagnosticType): string {
+  if (typeof diagnostic.text === 'string') {
+    return diagnostic.text;
+  }
+  return JSON.stringify(diagnostic); // Fallback
+}
+
+function convertTSDiagnosticToCM(diagnostic: TsServerDiagnosticType, code: string): Diagnostic {
+  const message = tsDiagnosticMessage(diagnostic);
+
+  // parse conversion TS server is {line, offset} to CodeMirror {from, to} in absolute chars
+  return {
+    from: Math.min(
+      code.length - 1,
+      code
+        .split('\n')
+        .slice(0, diagnostic.start.line - 1)
+        .join('\n').length + diagnostic.start.offset,
+    ),
+    to: Math.min(
+      code.length - 1,
+      code
+        .split('\n')
+        .slice(0, diagnostic.end.line - 1)
+        .join('\n').length + diagnostic.end.offset,
+    ),
+    message: message,
+    severity: tsCategoryToSeverity(diagnostic),
+  };
+}
+
+function tsLinter(
+  cell: CodeCellType,
+  getTsServerDiagnostics: (id: string) => TsServerDiagnosticType[],
+  getTsServerSuggestions: (id: string) => TsServerDiagnosticType[],
+) {
+  const semanticDiagnostics = getTsServerDiagnostics(cell.id);
+  const syntaticDiagnostics = getTsServerSuggestions(cell.id);
+  const diagnostics = [...syntaticDiagnostics, ...semanticDiagnostics].filter(
+    isDiagnosticWithLocation,
+  );
+
+  const cm_diagnostics = diagnostics.map((diagnostic) => {
+    return convertTSDiagnosticToCM(diagnostic, cell.source);
+  });
+
+  return linter(async (): Promise<readonly Diagnostic[]> => {
+    return cm_diagnostics;
+  });
+}
+
 function CodeEditor({
   cell,
   runCell,
@@ -555,7 +635,11 @@ function CodeEditor({
   readOnly: boolean;
 }) {
   const { codeTheme } = useTheme();
-  const { updateCell: updateCellOnClient } = useCells();
+  const {
+    updateCell: updateCellOnClient,
+    getTsServerDiagnostics,
+    getTsServerSuggestions,
+  } = useCells();
 
   const updateCellOnServerDebounced = useDebouncedCallback(updateCellOnServer, DEBOUNCE_DELAY);
 
@@ -566,6 +650,8 @@ function CodeEditor({
 
   let extensions = [
     javascript({ typescript: true }),
+    // wordHoverExtension,
+    tsLinter(cell, getTsServerDiagnostics, getTsServerSuggestions),
     Prec.highest(keymap.of([{ key: 'Mod-Enter', run: evaluateModEnter }])),
   ];
   if (readOnly) {