diff --git a/src/engine/rule-engine.ts b/src/engine/rule-engine.ts
index 0ba1643..90761d6 100644
--- a/src/engine/rule-engine.ts
+++ b/src/engine/rule-engine.ts
@@ -1,11 +1,11 @@
 import chalk from "chalk";
-import type { Config, Rule, TranslationFiles } from "../types";
+import type { Config, Rule, TranslationFiles } from "../types.ts";
 import * as rules from "../rules/index.js";
 import { ProblemStore } from "../classes/problem-store.class.js";
-import { getRuleIgnoreKeys, getRuleSeverity } from "../utils/rules-helpers";
-import { RULE_TYPE, SEVERITY_LEVEL } from "../constants";
-import { loadLanguageFiles } from "../utils/file-helpers";
-import { Logger } from "../classes/logger.class";
+import { getRuleIgnoreKeys, getRuleSeverity } from "../utils/rules-helpers.ts";
+import { RULE_TYPE, SEVERITY_LEVEL } from "../constants.ts";
+import { loadLanguageFiles } from "../utils/file-helpers.ts";
+import { Logger } from "../classes/logger.class.ts";
 
 function runRules(config: Config) {
 	const problemStore = new ProblemStore();
diff --git a/src/rules/no-extra-whitespace/index.ts b/src/rules/no-extra-whitespace/index.ts
index 71d72b7..ada33cf 100644
--- a/src/rules/no-extra-whitespace/index.ts
+++ b/src/rules/no-extra-whitespace/index.ts
@@ -1 +1 @@
-export { noExtraWhitespace } from "./no-extra-whitespace";
+export { noExtraWhitespace } from "./no-extra-whitespace.ts";
diff --git a/src/rules/no-extra-whitespace/problems.ts b/src/rules/no-extra-whitespace/problems.ts
index 25fd600..6858ef7 100644
--- a/src/rules/no-extra-whitespace/problems.ts
+++ b/src/rules/no-extra-whitespace/problems.ts
@@ -1,5 +1,5 @@
-import { Problem } from "../../classes/problem.class";
-import { RuleMeta, RuleSeverity } from "../../types";
+import { Problem } from "../../classes/problem.class.ts";
+import { RuleMeta, RuleSeverity } from "../../types.ts";
 
 type ProblemContext = {
 	key: string;
diff --git a/src/rules/no-html-messages/index.ts b/src/rules/no-html-messages/index.ts
index 23dadb6..45b8190 100644
--- a/src/rules/no-html-messages/index.ts
+++ b/src/rules/no-html-messages/index.ts
@@ -1 +1 @@
-export { noHtmlMessages } from "./no-html-messages";
+export { noHtmlMessages } from "./no-html-messages.ts";
diff --git a/src/rules/no-html-messages/problems.ts b/src/rules/no-html-messages/problems.ts
index 4f4f73a..1277e16 100644
--- a/src/rules/no-html-messages/problems.ts
+++ b/src/rules/no-html-messages/problems.ts
@@ -1,5 +1,5 @@
-import { Problem } from "../../classes/problem.class";
-import { RuleMeta, RuleSeverity } from "../../types";
+import { Problem } from "../../classes/problem.class.ts";
+import { RuleMeta, RuleSeverity } from "../../types.ts";
 
 type ProblemContext = {
 	key: string;
diff --git a/src/rules/no-invalid-configuration/no-invalid-configuration.spec.ts b/src/rules/no-invalid-configuration/no-invalid-configuration.spec.ts
index 6adae29..65f9e4a 100644
--- a/src/rules/no-invalid-configuration/no-invalid-configuration.spec.ts
+++ b/src/rules/no-invalid-configuration/no-invalid-configuration.spec.ts
@@ -1,11 +1,11 @@
-import { createMockProblemReporter } from "../../utils/test-helpers";
+import { createMockProblemReporter } from "../../utils/test-helpers.ts";
 import {
 	Config,
 	RuleContext,
 	RuleSeverity,
 	TranslationFiles,
 } from "../../types.ts";
-import { noInvalidConfiguration } from "./no-invalid-configuration";
+import { noInvalidConfiguration } from "./no-invalid-configuration.ts";
 import {
 	getInvalidPathToTranslatedFilesProblem,
 	getInvalidTranslationFilesProblem,
diff --git a/src/rules/no-invalid-configuration/no-invalid-configuration.ts b/src/rules/no-invalid-configuration/no-invalid-configuration.ts
index 44d8ae6..37049c5 100644
--- a/src/rules/no-invalid-configuration/no-invalid-configuration.ts
+++ b/src/rules/no-invalid-configuration/no-invalid-configuration.ts
@@ -9,7 +9,7 @@ import { isEmptyString } from "../../utils/string-helpers.ts";
 import {
 	configurableRuleNames,
 	unConfigurableRuleNames,
-} from "../../constants";
+} from "../../constants.ts";
 import {
 	getInvalidTranslationFilesProblem,
 	getMissingSourceFileProblem,
diff --git a/src/rules/no-invalid-variables/index.ts b/src/rules/no-invalid-variables/index.ts
index 1feb8bf..e89e603 100644
--- a/src/rules/no-invalid-variables/index.ts
+++ b/src/rules/no-invalid-variables/index.ts
@@ -1 +1 @@
-export { noInvalidVariables } from "./no-invalid-variables";
+export { noInvalidVariables } from "./no-invalid-variables.ts";
diff --git a/src/rules/no-invalid-variables/no-invalid-variables.spec.ts b/src/rules/no-invalid-variables/no-invalid-variables.spec.ts
index 638f474..526ea6a 100644
--- a/src/rules/no-invalid-variables/no-invalid-variables.spec.ts
+++ b/src/rules/no-invalid-variables/no-invalid-variables.spec.ts
@@ -5,7 +5,7 @@ import {
 	RuleSeverity,
 	TranslationFiles,
 } from "../../types.js";
-import { noInvalidVariables } from "./no-invalid-variables";
+import { noInvalidVariables } from "./no-invalid-variables.ts";
 import {
 	getMismatchedVariableFromSourceProblem,
 	getMissingVariableFromSourceProblem,
diff --git a/src/rules/no-invalid-variables/problems.ts b/src/rules/no-invalid-variables/problems.ts
index 2f5ae69..f4b2843 100644
--- a/src/rules/no-invalid-variables/problems.ts
+++ b/src/rules/no-invalid-variables/problems.ts
@@ -1,5 +1,5 @@
-import { Problem } from "../../classes/problem.class";
-import { RuleMeta, RuleSeverity } from "../../types";
+import { Problem } from "../../classes/problem.class.ts";
+import { RuleMeta, RuleSeverity } from "../../types.ts";
 
 type ProblemContext = {
 	key: string;
diff --git a/src/rules/no-malformed-keys/custom-key-name-validation.js b/src/rules/no-malformed-keys/custom-key-name-validation.js
index ed61ccb..ac63418 100644
--- a/src/rules/no-malformed-keys/custom-key-name-validation.js
+++ b/src/rules/no-malformed-keys/custom-key-name-validation.js
@@ -2,4 +2,4 @@
 // validation function to the no-malformed-keys.validationFunctionPath option
 module.exports = (key) => {
     return false;
-}
\ No newline at end of file
+};
diff --git a/src/rules/no-malformed-keys/index.ts b/src/rules/no-malformed-keys/index.ts
index 36f25fd..304fe16 100644
--- a/src/rules/no-malformed-keys/index.ts
+++ b/src/rules/no-malformed-keys/index.ts
@@ -1 +1 @@
-export { noMalformedKeys } from "./no-malformed-keys";
+export { noMalformedKeys } from "./no-malformed-keys.ts";
diff --git a/src/rules/no-malformed-keys/no-malformed-keys.ts b/src/rules/no-malformed-keys/no-malformed-keys.ts
index 6eba53d..9db701e 100644
--- a/src/rules/no-malformed-keys/no-malformed-keys.ts
+++ b/src/rules/no-malformed-keys/no-malformed-keys.ts
@@ -58,7 +58,7 @@ const noMalformedKeys: Rule = {
 			// Check if the user provided their own validation function. If supplied.
 			// this user-supplied validation function will be the only validation function that we run.
 			// At this point, Keeli is already running, so we can assume the provided function
-			// is valid, otherwise the problem would have ben caught when the configuration rules run.
+			// is valid, otherwise the problem would have been caught when the configuration rules run.
 			if (validationFunctionPath) {
 				// Load the function at the provided validationFunctionPath
 				validationFunction = require(validationFunctionPath);
diff --git a/src/rules/no-malformed-keys/problems.ts b/src/rules/no-malformed-keys/problems.ts
index 534ee5b..9106442 100644
--- a/src/rules/no-malformed-keys/problems.ts
+++ b/src/rules/no-malformed-keys/problems.ts
@@ -1,5 +1,5 @@
-import { Problem } from "../../classes/problem.class";
-import { RuleMeta, RuleSeverity } from "../../types";
+import { Problem } from "../../classes/problem.class.ts";
+import { RuleMeta, RuleSeverity } from "../../types.ts";
 
 type ProblemContext = {
 	key: string;
diff --git a/src/rules/no-missing-keys/index.ts b/src/rules/no-missing-keys/index.ts
index de0a71b..e0860e4 100644
--- a/src/rules/no-missing-keys/index.ts
+++ b/src/rules/no-missing-keys/index.ts
@@ -1 +1 @@
-export { noMissingKeys } from "./no-missing-keys";
+export { noMissingKeys } from "./no-missing-keys.ts";
diff --git a/src/rules/no-missing-keys/problems.ts b/src/rules/no-missing-keys/problems.ts
index 4f9da46..4829d1c 100644
--- a/src/rules/no-missing-keys/problems.ts
+++ b/src/rules/no-missing-keys/problems.ts
@@ -1,5 +1,5 @@
-import { Problem } from "../../classes/problem.class";
-import { RuleMeta, RuleSeverity } from "../../types";
+import { Problem } from "../../classes/problem.class.ts";
+import { RuleMeta, RuleSeverity } from "../../types.ts";
 
 type ProblemContext = {
 	key: string;
diff --git a/src/rules/no-untranslated-messages/problems.ts b/src/rules/no-untranslated-messages/problems.ts
index cbe3779..ff5c3c2 100644
--- a/src/rules/no-untranslated-messages/problems.ts
+++ b/src/rules/no-untranslated-messages/problems.ts
@@ -1,5 +1,5 @@
-import { Problem } from "../../classes/problem.class";
-import { RuleMeta, RuleSeverity } from "../../types";
+import { Problem } from "../../classes/problem.class.ts";
+import { RuleMeta, RuleSeverity } from "../../types.ts";
 
 type ProblemContext = {
 	key: string;
diff --git a/src/utils/config-helpers.spec.ts b/src/utils/config-helpers.spec.ts
index d50bad1..3f133c4 100644
--- a/src/utils/config-helpers.spec.ts
+++ b/src/utils/config-helpers.spec.ts
@@ -1,6 +1,6 @@
-import type { Config } from "../types";
+import type { Config } from "../types.ts";
 
-import { getAllSupportedLocales } from "./config-helpers";
+import { getAllSupportedLocales } from "./config-helpers.ts";
 
 describe("getAllSupportedLocales", () => {
 	it("should get all supported locales", () => {
diff --git a/src/utils/config-helpers.ts b/src/utils/config-helpers.ts
index 6ce0c9d..7581e3b 100644
--- a/src/utils/config-helpers.ts
+++ b/src/utils/config-helpers.ts
@@ -1,4 +1,4 @@
-import type { Config } from "../types";
+import type { Config } from "../types.ts";
 
 export function getAllSupportedLocales(config: Config): string[] {
 	const allSupportedLocales = new Set([
diff --git a/src/utils/file-helpers.spec.ts b/src/utils/file-helpers.spec.ts
index 7ad3609..3da2b70 100644
--- a/src/utils/file-helpers.spec.ts
+++ b/src/utils/file-helpers.spec.ts
@@ -1,5 +1,5 @@
-import type { TranslationFiles } from "../types";
-import { flatten } from "./file-helpers";
+import type { TranslationFiles } from "../types.ts";
+import { flatten } from "./file-helpers.ts";
 
 describe("flatten", () => {
 	it("should flatten nested JavaScript objects", () => {
diff --git a/src/utils/file-helpers.ts b/src/utils/file-helpers.ts
index c6cedaa..a5f284a 100644
--- a/src/utils/file-helpers.ts
+++ b/src/utils/file-helpers.ts
@@ -1,7 +1,7 @@
 import path from "node:path";
 import fs from "node:fs";
 import { flattie } from "flattie";
-import type { Config, TranslationFiles } from "../types";
+import type { Config, TranslationFiles } from "../types.ts";
 
 export function flatten(obj: TranslationFiles): Record<string, string> {
 	return flattie(obj, ".");
diff --git a/src/utils/message-helpers.spec.ts b/src/utils/message-helpers.spec.ts
index 810544d..fa356a6 100644
--- a/src/utils/message-helpers.spec.ts
+++ b/src/utils/message-helpers.spec.ts
@@ -1,4 +1,4 @@
-import { getMessageHasHtml } from "./message-helpers";
+import { getMessageHasHtml } from "./message-helpers.ts";
 
 describe("getMessageHasHtml", () => {
 	it("should return true for simple HTML tags", () => {
diff --git a/src/utils/rules-helpers.spec.ts b/src/utils/rules-helpers.spec.ts
index 802c66a..df3f4b3 100644
--- a/src/utils/rules-helpers.spec.ts
+++ b/src/utils/rules-helpers.spec.ts
@@ -1,5 +1,5 @@
-import type { Config, Rule, RuleSeverity, RuleMeta } from "../types";
-import { getRuleSeverity, getRuleIgnoreKeys } from "./rules-helpers";
+import type { Config, Rule, RuleMeta } from "../types.ts";
+import { getRuleSeverity, getRuleIgnoreKeys } from "./rules-helpers.ts";
 
 describe("getRuleSeverity", () => {
 	it("should get ruleMeta.defaultSeverity if none is supplied", () => {
diff --git a/src/utils/rules-helpers.ts b/src/utils/rules-helpers.ts
index 28115db..63004a9 100644
--- a/src/utils/rules-helpers.ts
+++ b/src/utils/rules-helpers.ts
@@ -1,5 +1,5 @@
-import { validSeverities } from "../constants";
-import type { Config, Rule, RuleSeverity } from "../types";
+import { validSeverities } from "../constants.ts";
+import type { Config, Rule, RuleSeverity } from "../types.ts";
 
 /**
  * Get the user-supplied (or default) configured severity of a specific rule.
diff --git a/src/utils/string-helpers.spec.ts b/src/utils/string-helpers.spec.ts
index 8a1043a..2f082fa 100644
--- a/src/utils/string-helpers.spec.ts
+++ b/src/utils/string-helpers.spec.ts
@@ -6,7 +6,7 @@ import {
 	isKebabCase,
 	stringHasWhitespacePadding,
 	stringHasExtraneousWhitespace,
-} from "./string-helpers";
+} from "./string-helpers.ts";
 
 describe("isEmptyString", () => {
 	it("should return true for empty strings", () => {
diff --git a/src/utils/test-helpers.ts b/src/utils/test-helpers.ts
index 259f6ed..14b9993 100644
--- a/src/utils/test-helpers.ts
+++ b/src/utils/test-helpers.ts
@@ -1,4 +1,4 @@
-import { ProblemStore } from "../classes/problem-store.class";
+import { ProblemStore } from "../classes/problem-store.class.ts";
 
 export const createMockProblemReporter = () => {
 	return {
diff --git a/src/utils/variable-helpers.spec.ts b/src/utils/variable-helpers.spec.ts
index 8808092..2ebd805 100644
--- a/src/utils/variable-helpers.spec.ts
+++ b/src/utils/variable-helpers.spec.ts
@@ -1,4 +1,4 @@
-import { hasUnbalancedBrackets } from "./variable-helpers";
+import { hasUnbalancedBrackets } from "./variable-helpers.ts";
 
 describe("hasUnbalancedBrackets", () => {
 	it("should return true for strings with unbalanced brackets", () => {