Added global vars in comments and removed duplicates

Author: h-a-r-d-i-k

src/javascript/string-locator-instawp.js

@@ -1,3 +1,4 @@
+/* global instawp_activate, ajaxurl */
 const MyPlugin = {
 	init( wp ) {
 		'use strict';

src/javascript/string-locator-replace.js

@@ -1,4 +1,4 @@
-// global stringLocatorReplace, fetch, confirm, FormData, Event
+/* global stringLocatorReplace, fetch, confirm, FormData, Event */
 document.addEventListener( 'DOMContentLoaded', function() {
 	const replaceStringField = document.getElementById( 'string-locator-replace-new-string' ),
 		replaceLoopbackCheckbox = document.getElementById( 'string-locator-replace-loopback-check' ),

src/javascript/string-locator-search.js

@@ -1,4 +1,3 @@
-// global string_locator, fetch, FormData
 document.addEventListener( 'DOMContentLoaded', function() {
 	let stringLocatorSearchActive = false,
 		searchType = '',

src/javascript/string-locator.js

@@ -1,4 +1,4 @@
-// global string_locator, fetch, FormData
+/* global string_locator */
 document.addEventListener( 'DOMContentLoaded', function() {
 	let StringLocator,
 		formData;