refactor: inline visitor object in getStatements

Author: Felipeness

lib/internal/test_runner/coverage.js

@@ -96,21 +96,6 @@ class TestCoverage {
 
     const statements = [];
 
-    // acorn-walk's simple() fires a generic "Statement" visitor for every
-    // node dispatched in a statement position (Program body, block bodies,
-    // if/for/while bodies, etc.). This automatically covers all current and
-    // future ESTree statement types without hardcoding a list.
-    const visitor = { __proto__: null };
-    visitor.Statement = (node) => {
-      if (kExcludedStatementTypes.has(node.type)) return;
-      ArrayPrototypePush(statements, {
-        __proto__: null,
-        startOffset: node.start,
-        endOffset: node.end,
-        count: 0,
-      });
-    };
-
     // Parse as script with permissive flags — script mode is non-strict,
     // so it handles legacy CJS (e.g. `with` statements) while the
     // allow* flags enable ESM syntax (import/export/top-level await).
@@ -132,7 +117,22 @@ class TestCoverage {
       return null;
     }
 
-    acornWalkSimple(ast, visitor);
+    // acorn-walk's simple() fires a generic "Statement" visitor for every
+    // node dispatched in a statement position (Program body, block bodies,
+    // if/for/while bodies, etc.). This automatically covers all current and
+    // future ESTree statement types without hardcoding a list.
+    acornWalkSimple(ast, {
+      __proto__: null,
+      Statement(node) {
+        if (kExcludedStatementTypes.has(node.type)) return;
+        ArrayPrototypePush(statements, {
+          __proto__: null,
+          startOffset: node.start,
+          endOffset: node.end,
+          count: 0,
+        });
+      },
+    });
 
     this.#sourceStatements.set(fileUrl, statements);
     return statements;