refactor: replace var statements (#742)

* refactor: replace `var` statements

* chore: lint

Author: Fdawgs

Diff for: index.js

@@ -252,20 +252,16 @@ const numberKeywords = [
  * https://datatracker.ietf.org/doc/html/draft-handrews-json-schema-validation-01#section-6
  */
 function inferTypeByKeyword (schema) {
-  // eslint-disable-next-line
-  for (var keyword of objectKeywords) {
+  for (const keyword of objectKeywords) {
     if (keyword in schema) return 'object'
   }
-  // eslint-disable-next-line
-  for (var keyword of arrayKeywords) {
+  for (const keyword of arrayKeywords) {
     if (keyword in schema) return 'array'
   }
-  // eslint-disable-next-line
-  for (var keyword of stringKeywords) {
+  for (const keyword of stringKeywords) {
     if (keyword in schema) return 'string'
   }
-  // eslint-disable-next-line
-  for (var keyword of numberKeywords) {
+  for (const keyword of numberKeywords) {
     if (keyword in schema) return 'number'
   }
   return schema.type

Diff for: lib/serializer.js

@@ -102,8 +102,7 @@ module.exports = class Serializer {
       let result = ''
       let last = -1
       let point = 255
-      // eslint-disable-next-line
-      for (var i = 0; i < len; i++) {
+      for (let i = 0; i < len; i++) {
         point = str.charCodeAt(i)
         if (
           point === 0x22 || // '"'