refactor(util): code refactor (#13872)

* refactor(util): code refactor

* refactor(util): code refactor

Author: Simon-He95

src/util/normalizeConfig.js

@@ -274,9 +274,7 @@ export function normalizeConfig(config) {
 
       if (typeof transform === 'function') {
         transformers.DEFAULT = transform
-      }
-
-      if (typeof transform === 'object' && transform !== null) {
+      } else if (typeof transform === 'object' && transform !== null) {
         Object.assign(transformers, transform)
       }
 

src/util/parseGlob.js

@@ -15,8 +15,7 @@ export function parseGlob(pattern) {
 
   if (glob.substr(0, 2) === './') {
     glob = glob.substr(2)
-  }
-  if (glob.charAt(0) === '/') {
+  } else if (glob.charAt(0) === '/') {
     glob = glob.substr(1)
   }
 

src/util/splitAtTopLevelOnly.js

@@ -29,11 +29,7 @@ export function splitAtTopLevelOnly(input, separator) {
       }
     }
 
-    if (isEscaped) {
-      isEscaped = false
-    } else if (char === '\\') {
-      isEscaped = true
-    }
+    isEscaped = isEscaped ? false : char === '\\'
 
     if (char === '(' || char === '[' || char === '{') {
       stack.push(char)