Refactor collapseLeadingSlashes function for simplicity and readability

index.js

@@ -127,18 +127,14 @@ function serveStatic (root, options) {
 
 /**
  * Collapse all leading slashes into a single slash
+ *
+ * @param {string} str
+ * @returns {string}
  * @private
  */
-function collapseLeadingSlashes (str) {
-  for (var i = 0; i < str.length; i++) {
-    if (str.charCodeAt(i) !== 0x2f /* / */) {
-      break
-    }
-  }
 
-  return i > 1
-    ? '/' + str.substr(i)
-    : str
+function collapseLeadingSlashes (str) {
+  return str.replace(/^\/+/, '/') || '/'
 }
 
 /**

scripts/version-history.js

@@ -53,11 +53,5 @@ function repeat (str, length) {
 }
 
 function zeroPad (number, length) {
-  var num = number.toString()
-
-  while (num.length < length) {
-    num = '0' + num
-  }
-
-  return num
+  return number.toString().padStart(length, '0')
 }