fix: use ESM dynamic import and export default

README.md

@@ -66,7 +66,7 @@ export function getTokenSync(token: string, ...parameters): string;
 export function getLanguages(): Promise<languages[]>;
 export function taggedString(str: string, ...keys: any[]): (...keys: any[]) => string;
 export function extend(language: string, tokens: Record<string, any>): void;
-export function extendFromSystemPath(path: string): void;
+export function extendFromSystemPath(path: string): Promise<void>;
 ```
 
 > **Note**

index.d.ts

@@ -8,7 +8,7 @@ declare namespace i18n {
   export function getLanguages(): Promise<languages[]>;
   export function taggedString(str: string, ...keys: any[]): (...keys: any[]) => string;
   export function extend(language: string, tokens: Record<string, any>): void;
-  export function extendFromSystemPath(path: string): void;
+  export function extendFromSystemPath(path: string): Promise<void>;
 }
 
 export = i18n;

index.js

@@ -3,6 +3,7 @@
 // Import Node.js Dependencies
 import fs from "node:fs";
 import path from "node:path";
+import { pathToFileURL } from "node:url";
 
 // Import Third-party Depedencies
 import cacache from "cacache";
@@ -94,7 +95,7 @@ export function extend(extendLanguage, opts = {}) {
   }
 }
 
-export function extendFromSystemPath(languagesDirPath) {
+export async function extendFromSystemPath(languagesDirPath) {
   if (!fs.existsSync(languagesDirPath)) {
     throw new Error(`The ${languagesDirPath} directory does not exist on this project.`);
   }
@@ -103,7 +104,11 @@ export function extendFromSystemPath(languagesDirPath) {
 
   for (const file of files) {
     const langName = path.basename(file.name, ".js");
-    const data = fs.readFileSync(path.join(languagesDirPath, file.name), "utf-8");
-    extend(langName, JSON.parse(data));
+    const fileLocation = path.join(languagesDirPath, file.name);
+
+    const i18nTokensFile = await import(pathToFileURL(fileLocation));
+    if ("default" in i18nTokensFile) {
+      extend(langName, i18nTokensFile.default);
+    }
   }
 }

test/i18n.js

@@ -149,8 +149,8 @@ describe("extend", () => {
 });
 
 describe("extendFromSystemPath", () => {
-  it("extendFromSystemPath with non-existing languages directory", () => {
-    assert.throws(
+  it("extendFromSystemPath with non-existing languages directory", async() => {
+    await assert.rejects(
       () => i18n.extendFromSystemPath(kI18nDir),
       {
         name: "Error",
@@ -164,10 +164,11 @@ describe("extendFromSystemPath", () => {
       fs.mkdirSync(kI18nDir);
       fs.writeFileSync(
         path.join(kI18nDir, "french.js"),
-        JSON.stringify({ hello: "Bonjour" })
+        // eslint-disable-next-line quotes
+        `export default { hello: "Bonjour" }`
       );
 
-      i18n.extendFromSystemPath(kI18nDir);
+      await i18n.extendFromSystemPath(kI18nDir);
       await i18n.setLocalLang("french");
 
       assert.deepEqual(await i18n.getToken("hello"), "Bonjour");