Address ESLint no-useless-escape

Author: shepmaster

ui/frontend/eslint.config.mjs

@@ -60,7 +60,6 @@ export default tseslint.config(
       ...reactHooksPlugin.configs.recommended.rules,
 
       // Disabled to upgrade to eslint 9
-      'no-useless-escape': 'off',
       'no-fallthrough': 'off',
       '@typescript-eslint/no-empty-object-type': 'off',
     },

ui/frontend/highlighting.ts

@@ -47,7 +47,7 @@ export function configureRustErrors({
     'rust-errors-help': {
       pattern: /help:.*\n/,
       inside: {
-        'feature-gate': /add `#\!\[feature\(.+?\)\]`/,
+        'feature-gate': /add `#!\[feature\(.+?\)\]`/,
       },
     },
     'backtrace': {
@@ -60,7 +60,7 @@ export function configureRustErrors({
   };
 
   Prism.languages.rust_mir = {
-    'mir-source': /src\/[A-Za-z0-9_.\-]+\.rs:\d+:\d+: \d+:\d+/,
+    'mir-source': /src\/[A-Za-z0-9_.-]+\.rs:\d+:\d+: \d+:\d+/,
   }
 
   Prism.hooks.add('wrap', env => {

ui/frontend/selectors/index.ts

@@ -23,7 +23,7 @@ export const hasTestsSelector = createSelector(codeSelector, code => !!code.matc
 // https://stackoverflow.com/a/34755045/155423
 const HAS_MAIN_FUNCTION_RE = new RegExp(
   [
-    /^([^\n\r\/]*;)?/,
+    /^([^\n\r/]*;)?/,
     /\s*(pub\s+)?\s*(const\s+)?\s*(async\s+)?\s*/,
     /fn\s+main\s*\(\s*(\/\*.*\*\/)?\s*\)/,
   ].map((r) => r.source).join(''),