diff --git a/src/modules/helpers.ts b/src/modules/helpers.ts
index d4b607d..0592266 100644
--- a/src/modules/helpers.ts
+++ b/src/modules/helpers.ts
@@ -2,84 +2,81 @@ import { default_value, translation_value_limit } from '../utils/micro';
 import { LanguageMapping } from './languages';
 import { TranslationModule, TranslationModules } from './modules';
 
-export function safeValueTransition(value: string) {
-  const value_safety: ValueSafety = valueIsSafe(value);
-
-  if (value_safety.is_safe === true) {
-    return value;
-  }
-
-  switch (value_safety.type) {
-    case nonSafeTypes.null:
-    case nonSafeTypes.undefined:
-    case nonSafeTypes.empty:
-      value = default_value;
-      break;
-    case nonSafeTypes.long:
-      value = value.substring(0, translation_value_limit);
-      break;
-  }
+// Define the enum for non-safe types
+enum nonSafeTypes {
+  long,
+  undefined,
+  null,
+  empty,
+}
 
-  return value;
+// Define the interface for ValueSafety
+interface ValueSafety {
+  is_safe: boolean;
+  type: nonSafeTypes | undefined;
 }
 
+/**
+ * Checks if a value is safe according to the defined criteria.
+ * @param value The string value to check.
+ * @returns An object indicating whether the value is safe and its type if not safe.
+ */
 function valueIsSafe(value: string): ValueSafety {
-  let result: ValueSafety = {
-    is_safe: true,
-    type: undefined,
-  };
-
-  if (value === undefined) {
-    result.is_safe = false;
-    result['type'] = nonSafeTypes.undefined;
-
-    return result;
-  }
-
-  if (value === null) {
-    result.is_safe = false;
-    result['type'] = nonSafeTypes.null;
+  if (value === undefined) return { is_safe: false, type: nonSafeTypes.undefined };
+  if (value === null) return { is_safe: false, type: nonSafeTypes.null };
+  if (value.length >= translation_value_limit) return { is_safe: false, type: nonSafeTypes.long };
+  if (value === '') return { is_safe: false, type: nonSafeTypes.empty };
 
-    return result;
-  }
+  return { is_safe: true, type: undefined };
+}
 
-  if (value.length >= translation_value_limit) {
-    result.is_safe = false;
-    result['type'] = nonSafeTypes.long;
+/**
+ * Transitions a value to a safe value if it does not meet the safety criteria.
+ * @param value The string value to transition.
+ * @returns The safe value.
+ */
+export function safeValueTransition(value: string): string {
+  const valueSafety: ValueSafety = valueIsSafe(value);
 
-    return result;
+  if (valueSafety.is_safe) {
+    return value;
   }
 
-  if (value === '') {
-    result.is_safe = false;
-    result['type'] = nonSafeTypes.empty;
-
-    return result;
+  switch (valueSafety.type) {
+    case nonSafeTypes.null:
+    case nonSafeTypes.undefined:
+    case nonSafeTypes.empty:
+      return default_value;
+    case nonSafeTypes.long:
+      return value.substring(0, translation_value_limit);
+    default:
+      throw new Error(`Unknown non-safe type: ${valueSafety.type}`);
   }
-
-  return result;
-}
-
-interface ValueSafety {
-  is_safe: boolean;
-  type: nonSafeTypes | undefined;
-}
-
-enum nonSafeTypes {
-  'long',
-  'undefined',
-  'null',
-  'empty',
 }
 
+/**
+ * Returns an array of keys from the TranslationModules object.
+ * @returns An array of keys.
+ */
 export function translationModuleKeys(): string[] {
   return Object.keys(TranslationModules);
 }
 
-export function getTranslationModuleByKey(key: string): TranslationModule {
+/**
+ * Retrieves a TranslationModule by its key.
+ * @param key The key of the TranslationModule.
+ * @returns The TranslationModule if found, otherwise undefined.
+ */
+export function getTranslationModuleByKey(key: string): TranslationModule | undefined {
   return TranslationModules[key];
 }
 
+/**
+ * Finds the language key from a given value in the languages object.
+ * @param value The value to find.
+ * @param languages The object containing language mappings.
+ * @returns The language key if found, otherwise undefined.
+ */
 export function getLanguageKeyFromValue(
   value: string,
   languages: Record<string, string>
@@ -87,27 +84,36 @@ export function getLanguageKeyFromValue(
   return Object.keys(languages).find(key => languages[key] === value);
 }
 
+/**
+ * Returns an array of language values from the languages object.
+ * @param languages The object containing language mappings.
+ * @returns An array of language values.
+ */
 export function getLanguageValues(languages: Record<string, string>): string[] {
   return Object.values(languages);
 }
 
+/**
+ * Finds the language variant for a given source and destination.
+ * @param source The source language.
+ * @param sourceValue The value in the source language.
+ * @param destination The destination language.
+ * @returns The translated value if found, otherwise undefined.
+ */
 export function getLanguageVariant(
   source: string,
   sourceValue: string,
   destination: string
 ): string | undefined {
-  let destinationValue: string | undefined = undefined;
-
-  for (let key of Object.keys(LanguageMapping)) {
+  for (const key of Object.keys(LanguageMapping)) {
     if (
       LanguageMapping[key].includes(source) &&
-      getTranslationModuleByKey(source).languages[key] === sourceValue &&
+      getTranslationModuleByKey(source)?.languages[key] === sourceValue &&
       LanguageMapping[key].includes(destination)
     ) {
-      destinationValue = getTranslationModuleByKey(destination).languages[key];
-      break;
+      return getTranslationModuleByKey(destination)?.languages[key];
     }
   }
 
-  return destinationValue;
+  return undefined;
 }