diff --git a/src/ActiveScriptsUI.js b/src/ActiveScriptsUI.js
index b48169546..12b3880bf 100644
--- a/src/ActiveScriptsUI.js
+++ b/src/ActiveScriptsUI.js
@@ -10,7 +10,7 @@ import {printArray, createElement,
         removeChildrenFromElement, exceptionAlert}  from "../utils/HelperFunctions.js";
 import {logBoxCreate}                               from "../utils/LogBox.js";
 import numeral                                      from "numeral/min/numeral.min";
-import {formatNumber}                               from "../utils/StringHelperFunctions.js";
+import {formatNumber}                               from "../utils/StringHelperFunctions";
 
 /* {
  *     serverName: {
diff --git a/src/Augmentations.js b/src/Augmentations.js
index fe3329ad4..a73a2430b 100644
--- a/src/Augmentations.js
+++ b/src/Augmentations.js
@@ -16,7 +16,7 @@ import {createElement, createAccordionElement,
         removeChildrenFromElement, clearObject}         from "../utils/HelperFunctions.js";
 import {Reviver, Generic_toJSON,
         Generic_fromJSON}                               from "../utils/JSONReviver.js";
-import {isString}                                       from "../utils/StringHelperFunctions.js";
+import {isString}                                       from "../utils/StringHelperFunctions";
 
 //Augmentations
 function Augmentation(params) {
diff --git a/src/Bladeburner.js b/src/Bladeburner.js
index 5451c3410..ae33a011f 100644
--- a/src/Bladeburner.js
+++ b/src/Bladeburner.js
@@ -18,7 +18,7 @@ import {getRandomInt, addOffset, clearObject,
 import {Reviver, Generic_toJSON,
         Generic_fromJSON}                           from "../utils/JSONReviver.js";
 import numeral                                      from "numeral/min/numeral.min";
-import {formatNumber}                               from "../utils/StringHelperFunctions.js";
+import {formatNumber}                               from "../utils/StringHelperFunctions";
 
 
 var CityNames = ["Aevum", "Chongqing", "Sector-12", "New Tokyo", "Ishima", "Volhaven"];
diff --git a/src/CinematicText.js b/src/CinematicText.js
index 4203335ba..41424e7ad 100644
--- a/src/CinematicText.js
+++ b/src/CinematicText.js
@@ -2,7 +2,7 @@ import {Engine}                             from "./engine.js";
 
 import {removeChildrenFromElement,
         createElement, exceptionAlert}      from "../utils/HelperFunctions.js";
-import {isString}                           from "../utils/StringHelperFunctions.js";
+import {isString}                           from "../utils/StringHelperFunctions";
 
 var cinematicTextFlag = false;
 
diff --git a/src/CompanyManagement.js b/src/CompanyManagement.js
index 3486a0f25..16c391c0c 100644
--- a/src/CompanyManagement.js
+++ b/src/CompanyManagement.js
@@ -14,7 +14,7 @@ import {getRandomInt, removeElementById,
 import {Reviver, Generic_toJSON,
         Generic_fromJSON}                               from "../utils/JSONReviver.js";
 import numeral                                          from "numeral/min/numeral.min";
-import {formatNumber, isString, generateRandomString}   from "../utils/StringHelperFunctions.js";
+import {formatNumber, isString, generateRandomString}   from "../utils/StringHelperFunctions";
 import {yesNoBoxCreate, yesNoTxtInpBoxCreate,
         yesNoBoxGetYesButton, yesNoBoxGetNoButton,
         yesNoTxtInpBoxGetYesButton, yesNoTxtInpBoxGetNoButton,
diff --git a/src/DarkWeb.js b/src/DarkWeb.js
index ed9992e20..4d10eb7cf 100644
--- a/src/DarkWeb.js
+++ b/src/DarkWeb.js
@@ -4,7 +4,7 @@ import {SpecialServerIps}                       from "./SpecialServerIps.js";
 import {post}                                   from "./Terminal.js";
 
 import {isValidIPAddress}                       from "../utils/IPAddress.js";
-import {formatNumber}                           from "../utils/StringHelperFunctions.js";
+import {formatNumber}                           from "../utils/StringHelperFunctions";
 
 
 /* DarkWeb.js */
diff --git a/src/Faction.js b/src/Faction.js
index c0607aa5e..4af69703c 100644
--- a/src/Faction.js
+++ b/src/Faction.js
@@ -16,7 +16,7 @@ import {clearEventListeners, createElement,
 import {Reviver, Generic_toJSON,
         Generic_fromJSON}                       from "../utils/JSONReviver.js";
 import numeral                                  from "numeral/min/numeral.min";
-import {formatNumber}                           from "../utils/StringHelperFunctions.js";
+import {formatNumber}                           from "../utils/StringHelperFunctions";
 import {yesNoBoxCreate, yesNoBoxGetYesButton,
         yesNoBoxGetNoButton, yesNoBoxClose}     from "../utils/YesNoBox.js";
 
diff --git a/src/Gang.js b/src/Gang.js
index 484f61b57..b3d107c72 100644
--- a/src/Gang.js
+++ b/src/Gang.js
@@ -11,7 +11,7 @@ import {getRandomInt, createElement,
         createAccordionElement, createPopup,
         removeElementById, removeElement}       from "../utils/HelperFunctions.js";
 import  numeral                                 from "numeral/min/numeral.min";
-import {formatNumber}                           from "../utils/StringHelperFunctions.js";
+import {formatNumber}                           from "../utils/StringHelperFunctions";
 import {yesNoBoxCreate, yesNoTxtInpBoxCreate,
         yesNoBoxGetYesButton, yesNoBoxGetNoButton,
         yesNoTxtInpBoxGetYesButton, yesNoTxtInpBoxGetNoButton,
diff --git a/src/HacknetNode.js b/src/HacknetNode.js
index b188a079a..938313a61 100644
--- a/src/HacknetNode.js
+++ b/src/HacknetNode.js
@@ -9,7 +9,7 @@ import {clearEventListeners, createElement,
         getElementById}                         from "../utils/HelperFunctions.js";
 import {Reviver, Generic_toJSON,
         Generic_fromJSON}                       from "../utils/JSONReviver.js";
-import {formatNumber}                           from "../utils/StringHelperFunctions.js";
+import {formatNumber}                           from "../utils/StringHelperFunctions";
 
 /**
  * Overwrites the inner text of the specified HTML element if it is different from what currently exists.
diff --git a/src/Infiltration.js b/src/Infiltration.js
index 345adf9f0..454ab3faa 100644
--- a/src/Infiltration.js
+++ b/src/Infiltration.js
@@ -5,7 +5,7 @@ import {Player}                                 from "./Player.js";
 import {dialogBoxCreate}                        from "../utils/DialogBox.js";
 import {clearEventListeners, getRandomInt}      from "../utils/HelperFunctions.js";
 import {infiltrationBoxCreate}                  from "../utils/InfiltrationBox.js";
-import {formatNumber}                           from "../utils/StringHelperFunctions.js";
+import {formatNumber}                           from "../utils/StringHelperFunctions";
 
 /* Infiltration.js
  *
diff --git a/src/Location.js b/src/Location.js
index 2e1d59085..1d24e3271 100644
--- a/src/Location.js
+++ b/src/Location.js
@@ -18,7 +18,7 @@ import {dialogBoxCreate}                        from "../utils/DialogBox.js";
 import {clearEventListeners, createElement}     from "../utils/HelperFunctions.js";
 import {createRandomIp}                         from "../utils/IPAddress.js";
 import numeral                                  from "numeral/min/numeral.min";
-import {formatNumber}                           from "../utils/StringHelperFunctions.js";
+import {formatNumber}                           from "../utils/StringHelperFunctions";
 import {yesNoBoxCreate, yesNoTxtInpBoxCreate,
         yesNoBoxGetYesButton, yesNoBoxGetNoButton,
         yesNoTxtInpBoxGetYesButton, yesNoTxtInpBoxGetNoButton,
diff --git a/src/Missions.js b/src/Missions.js
index c5128bff1..d7a5e34a7 100644
--- a/src/Missions.js
+++ b/src/Missions.js
@@ -6,7 +6,7 @@ import {dialogBoxCreate}                            from "../utils/DialogBox.js"
 import {addOffset, getRandomInt,
         clearEventListenersEl,
         clearEventListeners}                        from "../utils/HelperFunctions.js";
-import {formatNumber, isString}                     from "../utils/StringHelperFunctions.js";
+import {formatNumber, isString}                     from "../utils/StringHelperFunctions";
 import jsplumb                                      from 'jsplumb'
 
 let inMission = false; //Flag to denote whether a mission is running
diff --git a/src/NetscriptEvaluator.js b/src/NetscriptEvaluator.js
index de611370e..6f2e33057 100644
--- a/src/NetscriptEvaluator.js
+++ b/src/NetscriptEvaluator.js
@@ -11,7 +11,7 @@ import {Script, findRunningScript,
 import {parse, Node}                        from "../utils/acorn.js";
 import {printArray}                         from "../utils/HelperFunctions.js";
 import {isValidIPAddress}                   from "../utils/IPAddress.js";
-import {isString}                           from "../utils/StringHelperFunctions.js";
+import {isString}                           from "../utils/StringHelperFunctions";
 
 var Promise = require("bluebird");
 
diff --git a/src/NetscriptFunctions.js b/src/NetscriptFunctions.js
index b3e8ce6c4..edf3d453a 100644
--- a/src/NetscriptFunctions.js
+++ b/src/NetscriptFunctions.js
@@ -51,7 +51,7 @@ import Decimal                                      from "decimal.js";
 import {dialogBoxCreate}                            from "../utils/DialogBox.js";
 import {printArray, powerOfTwo}                     from "../utils/HelperFunctions.js";
 import {createRandomIp}                             from "../utils/IPAddress.js";
-import {formatNumber, isString, isHTML}             from "../utils/StringHelperFunctions.js";
+import {formatNumber, isString, isHTML}             from "../utils/StringHelperFunctions";
 import {yesNoBoxClose, yesNoBoxGetYesButton,
         yesNoBoxGetNoButton, yesNoBoxCreate,
         yesNoBoxOpen}                               from "../utils/YesNoBox.js";
diff --git a/src/Player.js b/src/Player.js
index c7497e1ec..effd037cc 100644
--- a/src/Player.js
+++ b/src/Player.js
@@ -27,7 +27,7 @@ import {Reviver, Generic_toJSON,
         Generic_fromJSON}                       from "../utils/JSONReviver.js";
 import numeral                                  from "numeral/min/numeral.min";
 import {formatNumber,
-        convertTimeMsToTimeElapsedString}       from "../utils/StringHelperFunctions.js";
+        convertTimeMsToTimeElapsedString}       from "../utils/StringHelperFunctions";
 
 function PlayerObject() {
     //Skills and stats
diff --git a/src/SaveObject.js b/src/SaveObject.js
index aa6195f45..eb08fc7a9 100644
--- a/src/SaveObject.js
+++ b/src/SaveObject.js
@@ -23,7 +23,7 @@ import {clearEventListeners, createElement,
         createPopup, removeElementById}         from "../utils/HelperFunctions.js";
 import {Reviver, Generic_toJSON,
         Generic_fromJSON}                       from "../utils/JSONReviver.js";
-import {formatNumber}                           from "../utils/StringHelperFunctions.js";
+import {formatNumber}                           from "../utils/StringHelperFunctions";
 
 import Decimal                                  from "decimal.js";
 
diff --git a/src/Script.js b/src/Script.js
index a636b8506..88981d632 100644
--- a/src/Script.js
+++ b/src/Script.js
@@ -38,7 +38,7 @@ import {Reviver, Generic_toJSON,
         Generic_fromJSON}                       from "../utils/JSONReviver.js";
 import {compareArrays, createElement}           from "../utils/HelperFunctions.js";
 import {formatNumber, numOccurrences,
-        numNetscriptOperators}                  from "../utils/StringHelperFunctions.js";
+        numNetscriptOperators}                  from "../utils/StringHelperFunctions";
 
 var keybindings = {
     ace: null,
diff --git a/src/StockMarket.js b/src/StockMarket.js
index 6db4a46a7..7dc46c5bd 100644
--- a/src/StockMarket.js
+++ b/src/StockMarket.js
@@ -12,7 +12,7 @@ import {clearEventListeners, getRandomInt,
 import {Reviver, Generic_toJSON,
         Generic_fromJSON}                       from "../utils/JSONReviver.js";
 import numeral                                  from "numeral/min/numeral.min";
-import {formatNumber}                           from "../utils/StringHelperFunctions.js";
+import {formatNumber}                           from "../utils/StringHelperFunctions";
 import {yesNoBoxCreate, yesNoTxtInpBoxCreate,
         yesNoBoxGetYesButton, yesNoBoxGetNoButton,
         yesNoTxtInpBoxGetYesButton, yesNoTxtInpBoxGetNoButton,
diff --git a/src/Terminal.js b/src/Terminal.js
index b17ac39aa..3b4eae01d 100644
--- a/src/Terminal.js
+++ b/src/Terminal.js
@@ -34,7 +34,7 @@ import {SpecialServerIps,
 import {TextFile, getTextFile}              from "./TextFile";
 
 import {containsAllStrings, longestCommonStart,
-        formatNumber, isString}             from "../utils/StringHelperFunctions.js";
+        formatNumber, isString}             from "../utils/StringHelperFunctions";
 import {addOffset, printArray}              from "../utils/HelperFunctions.js";
 import {logBoxCreate}                       from "../utils/LogBox.js";
 import {yesNoBoxCreate,
diff --git a/src/engine.js b/src/engine.js
index d57232da8..6db35356a 100644
--- a/src/engine.js
+++ b/src/engine.js
@@ -5,7 +5,8 @@ import {clearEventListeners, createElement,
         exceptionAlert}                         from "../utils/HelperFunctions.js";
 import numeral                                  from "numeral/min/numeral.min";
 import {formatNumber,
-        convertTimeMsToTimeElapsedString}       from "../utils/StringHelperFunctions.js";
+        convertTimeMsToTimeElapsedString,
+        replaceAt}                              from "../utils/StringHelperFunctions";
 import {loxBoxCreate, logBoxUpdateText,
         logBoxOpened}                           from "../utils/LogBox.js";
 
@@ -1170,7 +1171,7 @@ let Engine = {
 
         //Update progress bar
         while (Engine._actionProgressBarCount * 2 <= percent) {
-            Engine._actionProgressStr = Engine._actionProgressStr.replaceAt(Engine._actionProgressBarCount, "|");
+            Engine._actionProgressStr = replaceAt(Engine._actionProgressStr, Engine._actionProgressBarCount, "|");
             Engine._actionProgressBarCount += 1;
         }
 
diff --git a/utils/HelperFunctions.js b/utils/HelperFunctions.js
index 3e682fe5b..9f07ff54c 100644
--- a/utils/HelperFunctions.js
+++ b/utils/HelperFunctions.js
@@ -1,5 +1,5 @@
 //General helper functions
-import {isString}           from "./StringHelperFunctions.js";
+import {isString}           from "./StringHelperFunctions";
 import {dialogBoxCreate}    from "./DialogBox.js";
 
 //Returns the size (number of keys) of an object
diff --git a/utils/InfiltrationBox.js b/utils/InfiltrationBox.js
index 367d2c253..77bc501ad 100644
--- a/utils/InfiltrationBox.js
+++ b/utils/InfiltrationBox.js
@@ -4,7 +4,7 @@ import {Factions, Faction}                  from "../src/Faction.js";
 import {Player}                             from "../src/Player.js";
 import {dialogBoxCreate}                    from "./DialogBox.js";
 import {clearEventListeners}                from "./HelperFunctions.js";
-import {formatNumber}                       from "./StringHelperFunctions.js";
+import {formatNumber}                       from "./StringHelperFunctions";
 
 /* InfiltrationBox.js */
 function infiltrationBoxClose() {
diff --git a/utils/StringHelperFunctions.js b/utils/StringHelperFunctions.js
deleted file mode 100644
index 83b6856bc..000000000
--- a/utils/StringHelperFunctions.js
+++ /dev/null
@@ -1,150 +0,0 @@
-import {dialogBoxCreate} from "./DialogBox.js";
-
-//Netburner String helper functions
-
-//Searches for every occurence of searchStr within str and returns an array of the indices of
-//all these occurences
-function getIndicesOf(searchStr, str, caseSensitive) {
-    var searchStrLen = searchStr.length;
-    if (searchStrLen == 0) {
-        return [];
-    }
-    var startIndex = 0, index, indices = [];
-    if (!caseSensitive) {
-        str = str.toLowerCase();
-        searchStr = searchStr.toLowerCase();
-    }
-    while ((index = str.indexOf(searchStr, startIndex)) > -1) {
-        indices.push(index);
-        startIndex = index + searchStrLen;
-    }
-    return indices;
-}
-
-//Replaces the character at an index with a new character
-String.prototype.replaceAt=function(index, character) {
-    return this.substr(0, index) + character + this.substr(index+character.length);
-}
-
-//Converts a date representing time in milliseconds to a string with the format
-//      H hours M minutes and S seconds
-// e.g. 10000 -> "0 hours 0 minutes and 10 seconds"
-//      120000 -> "0 0 hours 2 minutes and 0 seconds"
-function convertTimeMsToTimeElapsedString(time) {
-    //Convert ms to seconds, since we only have second-level precision
-    time = Math.floor(time / 1000);
-
-    var days = Math.floor(time / 86400);
-    time %= 86400;
-
-    var hours = Math.floor(time / 3600);
-    time %= 3600;
-
-    var minutes = Math.floor(time / 60);
-    time %= 60;
-
-    var seconds = time;
-
-    var res = "";
-    if (days) {res += days + " days ";}
-    if (hours) {res += hours + " hours ";}
-    if (minutes) {res += minutes + " minutes ";}
-    res += seconds + " seconds ";
-    return res;
-}
-
-//Finds the longest common starting substring in a set of strings
-function longestCommonStart(strings) {
-    if (!containsAllStrings(strings)) {return;}
-    if (strings.length == 0) {return;}
-
-    var A = strings.concat().sort(),
-    a1= A[0], a2= A[A.length-1], L= a1.length, i= 0;
-    while(i<L && a1.charAt(i).toLowerCase() === a2.charAt(i).toLowerCase()) i++;
-    return a1.substring(0, i);
-}
-
-
-//Returns whether a variable is a string
-function isString(str) {
-    return (typeof str === 'string' || str instanceof String);
-}
-
-//Returns whether an array contains entirely of string objects
-function containsAllStrings(arr) {
-    return arr.every(isString);
-}
-
-//Formats a number with commas and a specific number of decimal digits
-function formatNumber(num, numFractionDigits) {
-    return num.toLocaleString(undefined, {
-        minimumFractionDigits: numFractionDigits,
-        maximumFractionDigits: numFractionDigits
-    });
-}
-
-//Count the number of times a substring occurs in a string
-function numOccurrences(string, subString) {
-    string += "";
-    subString += "";
-    if (subString.length <= 0) return (string.length + 1);
-
-    var n = 0, pos = 0, step = subString.length;
-
-    while (true) {
-        pos = string.indexOf(subString, pos);
-        if (pos >= 0) {
-            ++n;
-            pos += step;
-        } else break;
-    }
-    return n;
-}
-
-//Counters the number of Netscript operators in a string
-function numNetscriptOperators(string) {
-    var total = 0;
-    total += numOccurrences(string, "+");
-    total += numOccurrences(string, "-");
-    total += numOccurrences(string, "*");
-    total += numOccurrences(string, "/");
-    total += numOccurrences(string, "%");
-    total += numOccurrences(string, "&&");
-    total += numOccurrences(string, "||");
-    total += numOccurrences(string, "<");
-    total += numOccurrences(string, ">");
-    total += numOccurrences(string, "<=");
-    total += numOccurrences(string, ">=");
-    total += numOccurrences(string, "==");
-    total += numOccurrences(string, "!=");
-    if (isNaN(total)) {
-        dialogBoxCreate("ERROR in counting number of operators in script. This is a bug, please report to game developer");
-        total = 0;
-    }
-    return total;
-}
-
-//Checks if a string contains HTML elements
-function isHTML(str) {
-    var a = document.createElement('div');
-    a.innerHTML = str;
-    for (var c = a.childNodes, i = c.length; i--; ) {
-        if (c[i].nodeType == 1) return true;
-    }
-    return false;
-}
-
-//Generates a random alphanumeric string with N characters
-function generateRandomString(n) {
-    var str = "",
-        chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";
-
-    for (var i = 0; i < n; i++)
-        str += chars.charAt(Math.floor(Math.random() * chars.length));
-
-    return str;
-}
-
-export {getIndicesOf, convertTimeMsToTimeElapsedString, longestCommonStart,
-        isString, containsAllStrings, formatNumber,
-        numOccurrences, numNetscriptOperators, isHTML, generateRandomString};
diff --git a/utils/StringHelperFunctions.ts b/utils/StringHelperFunctions.ts
new file mode 100644
index 000000000..4f1994bd9
--- /dev/null
+++ b/utils/StringHelperFunctions.ts
@@ -0,0 +1,151 @@
+import { dialogBoxCreate } from "./DialogBox.js";
+
+// Netburner String helper functions
+
+// Replaces the character at an index with a new character
+function replaceAt(base: string, index: number, character: string): string {
+    return base.substr(0, index) + character + base.substr(index + character.length);
+}
+
+/*
+Converts a date representing time in milliseconds to a string with the format H hours M minutes and S seconds
+e.g.    10000 -> "0 hours 0 minutes and 10 seconds"
+        120000 -> "0 0 hours 2 minutes and 0 seconds"
+*/
+function convertTimeMsToTimeElapsedString(time: number): string {
+    const millisecondsPerSecond = 1000;
+    const secondPerMinute = 60;
+    const minutesPerHours = 60;
+    const secondPerHours: number = secondPerMinute * minutesPerHours;
+    const hoursPerDays = 24;
+    const secondPerDay: number = secondPerHours * hoursPerDays;
+
+    // Convert ms to seconds, since we only have second-level precision
+    const totalSeconds: number = Math.floor(time / millisecondsPerSecond);
+
+    const days: number = Math.floor(totalSeconds / secondPerDay);
+    const secTruncDays: number = totalSeconds % secondPerDay;
+
+    const hours: number = Math.floor(secTruncDays / secondPerHours);
+    const secTruncHours: number = secTruncDays % secondPerHours;
+
+    const minutes: number = Math.floor(secTruncHours / secondPerMinute);
+    const secTruncMinutes: number = secTruncHours % secondPerMinute;
+
+    const seconds: number = secTruncMinutes;
+
+    let res = "";
+    if (days) {res += `${days} days `; }
+    if (hours) {res += `${hours} hours `; }
+    if (minutes) {res += `${minutes} minutes `; }
+    res += `${seconds} seconds `;
+
+    return res;
+}
+
+// Finds the longest common starting substring in a set of strings
+function longestCommonStart(strings: string[]): string {
+    if (!containsAllStrings(strings)) {return ""; }
+    if (strings.length == 0) {return ""; }
+
+    const A: string[] = strings.concat().sort();
+    const a1: string = A[0];
+    const a2: string = A[A.length - 1];
+    const L: number = a1.length;
+    let i = 0;
+    while (i < L && a1.charAt(i).toLowerCase() === a2.charAt(i).toLowerCase()) { i++; }
+
+    return a1.substring(0, i);
+}
+
+// Returns whether a variable is a string
+function isString(str: any): boolean {
+    return (typeof str === "string" || str instanceof String);
+}
+
+// Returns whether an array contains entirely of string objects
+function containsAllStrings(arr: string[]): boolean {
+    return arr.every(isString);
+}
+
+// Formats a number with commas and a specific number of decimal digits
+function formatNumber(num: number, numFractionDigits: number): string {
+    return num.toLocaleString(undefined, {
+        maximumFractionDigits: numFractionDigits,
+        minimumFractionDigits: numFractionDigits,
+    });
+}
+
+// Count the number of times a substring occurs in a string
+function numOccurrences(text: string, subString: string): number {
+    text += "";
+    subString += "";
+    if (subString.length <= 0) { return (text.length + 1); }
+
+    let n = 0;
+    let pos = 0;
+    const step: number = subString.length;
+
+    while (true) {
+        pos = text.indexOf(subString, pos);
+        if (pos >= 0) {
+            ++n;
+            pos += step;
+        } else { break; }
+    }
+
+    return n;
+}
+
+// Counters the number of Netscript operators in a string
+function numNetscriptOperators(text: string): number {
+    const total: number = numOccurrences(text, "+") +
+        numOccurrences(text, "-") +
+        numOccurrences(text, "*") +
+        numOccurrences(text, "/") +
+        numOccurrences(text, "%") +
+        numOccurrences(text, "&&") +
+        numOccurrences(text, "||") +
+        numOccurrences(text, "<") +
+        numOccurrences(text, ">") +
+        numOccurrences(text, "<=") +
+        numOccurrences(text, ">=") +
+        numOccurrences(text, "==") +
+        numOccurrences(text, "!=");
+    if (isNaN(total)) {
+        const message = "ERROR in counting number of operators in script. This is a bug, please report to game developer";
+        dialogBoxCreate(message, false);
+
+        return 0;
+    }
+
+    return total;
+}
+
+// Checks if a string contains HTML elements
+function isHTML(str: string): boolean {
+    const a = document.createElement("div");
+    a.innerHTML = str;
+    const c = a.childNodes;
+    for (let i = c.length; i--;) {
+        if (c[i].nodeType == 1) { return true; }
+    }
+
+    return false;
+}
+
+// Generates a random alphanumeric string with N characters
+function generateRandomString(n: number): string {
+    let str = "";
+    const chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";
+
+    for (let i = 0; i < n; i++) {
+        str += chars.charAt(Math.floor(Math.random() * chars.length));
+    }
+
+    return str;
+}
+
+export {convertTimeMsToTimeElapsedString, longestCommonStart,
+        isString, containsAllStrings, formatNumber,
+        numOccurrences, numNetscriptOperators, isHTML, generateRandomString, replaceAt};