Avoid reusing variable unnecessarily

packages/enzyme/src/selectors.js

@@ -337,9 +337,8 @@ export function reduceTreeBySelector(selector, root) {
   } else if (typeof selector === 'string') {
     const tokens = safelyGenerateTokens(selector);
     let index = 0;
-    let token = null;
     while (index < tokens.length) {
-      token = tokens[index];
+      const token = tokens[index];
       /**
        * There are two types of tokens in a CSS selector:
        *
@@ -364,8 +363,7 @@ export function reduceTreeBySelector(selector, root) {
         // We assume the next token is a selector, so move the index
         // forward and build the predicate.
         index += 1;
-        token = tokens[index];
-        const predicate = buildPredicateFromToken(token);
+        const predicate = buildPredicateFromToken(tokens[index]);
         // We match against only the nodes which have already been matched,
         // since a combinator is meant to refine a previous selector.
         switch (type) {