'Enable Bracket Matching' option in Codemirror

website/src/repl/Repl.css

@@ -64,3 +64,8 @@
 #code .cm-focused {
   outline: none;
 }
+
+#code .cm-matchingBracket {
+  text-decoration: underline 0.18rem;
+  text-underline-offset: 0.25rem;
+}

website/src/repl/panel/SettingsTab.jsx

@@ -77,6 +77,7 @@ export function SettingsTab({ started }) {
   const {
     theme,
     keybindings,
+    isBracketMatchingEnabled,
     isLineNumbersDisplayed,
     isPatternHighlightingEnabled,
     isActiveLineHighlighted,
@@ -137,6 +138,11 @@ export function SettingsTab({ started }) {
         ></ButtonGroup>
       </FormItem>
       <FormItem label="Code Settings">
+        <Checkbox
+          label="Enable bracket matching"
+          onChange={(cbEvent) => settingsMap.setKey('isBracketMatchingEnabled', cbEvent.target.checked)}
+          value={isBracketMatchingEnabled}
+        />
         <Checkbox
           label="Display line numbers"
           onChange={(cbEvent) => settingsMap.setKey('isLineNumbersDisplayed', cbEvent.target.checked)}