lint frontend

frontend/eslint.config.js

@@ -1,16 +1,21 @@
 import js from '@eslint/js';
+import react from 'eslint-plugin-react';
 import reactHooks from 'eslint-plugin-react-hooks';
 
 export default [
   js.configs.recommended,
   {
     files: ['src/**/*.{js,jsx}'],
-    plugins: { 'react-hooks': reactHooks },
+    plugins: {
+      react,
+      'react-hooks': reactHooks,
+    },
     languageOptions: {
       ecmaVersion: 'latest',
       sourceType: 'module',
       parserOptions: { ecmaFeatures: { jsx: true } },
       globals: {
+        // Browser APIs
         window: 'readonly',
         document: 'readonly',
         console: 'readonly',
@@ -33,11 +38,15 @@ export default [
         Image: 'readonly',
         WebSocket: 'readonly',
         HTMLElement: 'readonly',
+        Element: 'readonly',
         ClipboardItem: 'readonly',
         CSS: 'readonly',
         ResizeObserver: 'readonly',
         MutationObserver: 'readonly',
         IntersectionObserver: 'readonly',
+        TextEncoder: 'readonly',
+        TextDecoder: 'readonly',
+        Buffer: 'readonly',
         atob: 'readonly',
         btoa: 'readonly',
         performance: 'readonly',
@@ -45,6 +54,9 @@ export default [
         queueMicrotask: 'readonly',
       },
     },
+    settings: {
+      react: { version: 'detect' },
+    },
     rules: {
       // Prevent the TDZ bug
       'no-use-before-define': ['error', { functions: false, classes: false, variables: true }],
@@ -53,10 +65,24 @@ export default [
       'react-hooks/rules-of-hooks': 'error',
       'react-hooks/exhaustive-deps': 'warn',
 
+      // React JSX correctness
+      'react/jsx-key': 'error',
+      'react/jsx-no-duplicate-props': 'error',
+      'react/no-children-prop': 'error',
+      'react/no-danger-with-children': 'error',
+      'react/no-direct-mutation-state': 'error',
+      'react/no-unescaped-entities': 'warn',
+
       // Turn off rules that are noisy without adding safety
+      'react/react-in-jsx-scope': 'off',       // not needed with React 17+ JSX transform
+      'react/prop-types': 'off',                // no PropTypes in this codebase
+      'react/no-unknown-property': 'off',       // false positives with Three.js / custom attrs
       'no-unused-vars': ['warn', { argsIgnorePattern: '^_', varsIgnorePattern: '^_' }],
       'no-empty': 'off',
       'no-prototype-builtins': 'off',
     },
+    linterOptions: {
+      reportUnusedDisableDirectives: 'off',
+    },
   },
 ];

frontend/package.json

@@ -27,6 +27,7 @@
     "@vitejs/plugin-react": "^4.3.0",
     "c8": "^10.1.3",
     "eslint": "^9.39.4",
+    "eslint-plugin-react": "^7.37.5",
     "eslint-plugin-react-hooks": "^5.2.0",
     "vite": "^5.4.0"
   }

frontend/src/App.jsx

@@ -877,6 +877,11 @@ function Flow() {
   const journalContentRef = useRef('');
   const reactFlow = useReactFlow();
 
+  const scheduleAutoRun = useCallback(() => {
+    clearTimeout(autoRunTimer.current);
+    autoRunTimer.current = setTimeout(() => autoRunRef.current?.(), 300);
+  }, []);
+
   // ── WebSocket ───────────────────────────────────────────────────────
 
   const updateNodeData = useCallback((nodeId, patch) => {
@@ -1648,6 +1653,14 @@ function Flow() {
     });
   }, [reactFlow]);
 
+  const openJournalTab = useCallback(() => {
+    setHelpTabs((prev) => {
+      if (prev.find((t) => t.label === 'Journal')) return prev;
+      return [...prev, { label: 'Journal', type: 'journal', content: journalContentRef.current }];
+    });
+    setActiveHelpTab('Journal');
+  }, []);
+
   // ── Add node from context menu ──────────────────────────────────────
 
   const addNode = useCallback((className, def) => {
@@ -1797,11 +1810,6 @@ function Flow() {
     });
   };
 
-  const scheduleAutoRun = useCallback(() => {
-    clearTimeout(autoRunTimer.current);
-    autoRunTimer.current = setTimeout(() => autoRunRef.current?.(), 300);
-  }, []);
-
   const onRuntimeValuesChange = useCallback((nodeId, patch, { scheduleRun = false } = {}) => {
     if (!patch || typeof patch !== 'object') return;
 
@@ -1958,14 +1966,6 @@ function Flow() {
     });
   }, []);
 
-  const openJournalTab = useCallback(() => {
-    setHelpTabs((prev) => {
-      if (prev.find((t) => t.label === 'Journal')) return prev;
-      return [...prev, { label: 'Journal', type: 'journal', content: journalContentRef.current }];
-    });
-    setActiveHelpTab('Journal');
-  }, []);
-
   const updateTabContent = useCallback((label, content) => {
     if (label === 'Journal') journalContentRef.current = content;
     setHelpTabs((prev) => prev.map((t) => t.label === label ? { ...t, content } : t));

frontend/src/CustomNode.jsx

@@ -980,13 +980,6 @@ function NodeTable({ rows }) {
 
 function CustomNode({ id, data }) {
   const ctx = useContext(NodeContext);
-
-  if (data.className === 'Group') {
-    return <GroupNode id={id} data={data} />;
-  }
-  if (data.className === 'TextNote') {
-    return <TextNoteNode id={id} data={data} />;
-  }
   const def = data.definition;
   const scalarDisplay = formatScalarDisplay(data.scalarValue);
   const processingTimeText = formatProcessingTime(data.processingTimeMs);
@@ -996,6 +989,7 @@ function CustomNode({ id, data }) {
 
   // Find the COORDPAIR input name (if any) so we can resolve live upstream positions
   const coordPairInputName = React.useMemo(() => {
+    if (!def) return null;
     const allInputs = { ...def.input.required, ...def.input.optional };
     for (const [name, spec] of Object.entries(allInputs)) {
       const type = Array.isArray(spec) ? spec[0] : spec;
@@ -1018,8 +1012,8 @@ function CustomNode({ id, data }) {
   );
 
   // Parse inputs into data handles and widgets
-  const required = def.input.required || {};
-  const optional = def.input.optional || {};
+  const required = def?.input?.required || {};
+  const optional = def?.input?.optional || {};
 
   const dataInputs = [];
   const widgets = [];
@@ -1044,7 +1038,7 @@ function CustomNode({ id, data }) {
 
   // For manual-trigger nodes (Save), show progressive optional inputs:
   // show field_N only if field_(N-1) is connected (or N==0).
-  const isProgressive = def.manual_trigger;
+  const isProgressive = def?.manual_trigger;
   const connectedInputs = useStore(
     useCallback(
       (s) => {
@@ -1075,6 +1069,13 @@ function CustomNode({ id, data }) {
     ),
   );
 
+  if (data.className === 'Group') {
+    return <GroupNode id={id} data={data} />;
+  }
+  if (data.className === 'TextNote') {
+    return <TextNoteNode id={id} data={data} />;
+  }
+
   for (const [name, spec] of Object.entries(optional)) {
     const [type, opts] = getSpecTypeAndOptions(spec);
     if (isProgressive && isDataSocketSpec(spec)) {
@@ -1210,7 +1211,7 @@ function CustomNode({ id, data }) {
                       style={{ background: TYPE_COLORS[socketType] || 'var(--fallback-type)' }}
                     />
                   )}
-                  {!!(
+                  {(
                     (w.socketType && connectedInputs?.has(w.name))
                     || (combinedInputName && connectedInputs?.has(combinedInputName))
                   ) ? (
@@ -1556,7 +1557,6 @@ function TextInputValueBox({ val, placeholder, nodeId, name, label, hideLabel, o
       >
         {editing ? (
           <input
-            // eslint-disable-next-line jsx-a11y/no-autofocus
             autoFocus
             className="nodrag"
             type="text"

frontend/src/HelpPanelManager.jsx

@@ -11,7 +11,7 @@ function parseHeadings(md) {
   for (const line of lines) {
     const m = line.match(/^(#{1,6})\s+(.+)/);
     if (m) {
-      const text = m[2].replace(/[*_`~\[\]]/g, '').trim();
+      const text = m[2].replace(/[*_`~[\]]/g, '').trim();
       const id = text.toLowerCase().replace(/[^\w]+/g, '-').replace(/(^-|-$)/g, '');
       headings.push({ level: m[1].length, text, id });
     }
@@ -187,7 +187,6 @@ function JournalTab({ content, onChange, onOpenDoc }) {
             }
           }}
           placeholder="Write your notes here (Markdown supported)…"
-          // eslint-disable-next-line jsx-a11y/no-autofocus
           autoFocus
         />
       ) : renderedHtml ? (

frontend/src/valueFormatting.js

@@ -7,6 +7,10 @@ const SI_PREFIX_MULTIPLIERS = {
 
 const NUMBER_WITH_UNIT_RE = /^([+-]?(?:\d+\.?\d*|\.\d+)(?:[eE][+-]?\d+)?)\s*(.*)?$/;
 
+const PREFIXABLE_UNITS = new Set([
+  'm', 's', 'A', 'V', 'W', 'Hz', 'F', 'C', 'J', 'N', 'Pa', 'T', 'H', 'S', 'g', 'K', 'Ohm', 'ohm', 'Ω',
+]);
+
 /**
  * Parse a string like "1.5 nm" into { numeric: 1.5e-9, unit: "m" }.
  * Returns null if the string does not start with a valid number.
@@ -56,10 +60,6 @@ const SI_PREFIXES = [
   { exp: 24, prefix: 'Y' },
 ];
 
-const PREFIXABLE_UNITS = new Set([
-  'm', 's', 'A', 'V', 'W', 'Hz', 'F', 'C', 'J', 'N', 'Pa', 'T', 'H', 'S', 'g', 'K', 'Ohm', 'ohm', 'Ω',
-]);
-
 const SUPERSCRIPT_DIGITS = {
   '-': '⁻',
   '0': '⁰',