diff --git a/build/dist.ts b/build/dist.ts
index 73bcc932..7f9cfbcd 100644
--- a/build/dist.ts
+++ b/build/dist.ts
@@ -17,86 +17,86 @@ async function documents(): Promise<void> {
         await fs.promises.link(`${ROOT}/${file}`, `${DIST}/${file}`);
 }
 
-const substitude = 
-    (content: string) => 
-        content.replace(
-            /(import|export)(.*)from "(.\/|..\/)(.*)"/g, 
-            str => {
-                const to: number = str.lastIndexOf(`"`);
-                return [
-                    str.substring(0, to),
-                    `.mjs"`,
-                    str.substring(to + 1)
-                ].join("");
-            }
-        );
+// const substitude = 
+//     (content: string) => 
+//         content.replace(
+//             /(import|export)(.*)from "(.\/|..\/)(.*)"/g, 
+//             str => {
+//                 const to: number = str.lastIndexOf(`"`);
+//                 return [
+//                     str.substring(0, to),
+//                     `.mjs"`,
+//                     str.substring(to + 1)
+//                 ].join("");
+//             }
+//         );
 
-async function module(): Promise<void> {
-    const declaration = async (location: string)=> {
-        const content = substitude(
-            await fs.promises.readFile(location, "utf8")
-        );
-        await fs.promises.unlink(location);
-        await fs.promises.writeFile(
-            `${location.substring(0, location.length - 5)}.d.mts`, 
-            content, 
-            "utf8"
-        );
-    };
-    const javascript = async (location: string, file: string) => {
-        const content = substitude(
-                await fs.promises.readFile(location, "utf8")
-            )
-            .replace(
-                `//# sourceMappingURL=${file}.map`, 
-                `//# sourceMappingURL=${file.substring(0, file.length - 3)}.mjs.map`
-            );
-        await fs.promises.unlink(location);
-        await fs.promises.writeFile(
-            `${location.substring(0, location.length - 3)}.mjs`, 
-            content, 
-            "utf8"
-        );
-    };
-    const mapper = async (location: string) => {
-        const content: string = await fs.promises.readFile(location, "utf8");
-        const parsed: {file: string } = JSON.parse(content);
-        parsed.file = parsed.file.substring(0, parsed.file.length - 3) + ".mjs";
+// async function module(): Promise<void> {
+//     const declaration = async (location: string)=> {
+//         const content = substitude(
+//             await fs.promises.readFile(location, "utf8")
+//         );
+//         await fs.promises.unlink(location);
+//         await fs.promises.writeFile(
+//             `${location.substring(0, location.length - 5)}.d.mts`, 
+//             content, 
+//             "utf8"
+//         );
+//     };
+//     const javascript = async (location: string, file: string) => {
+//         const content = substitude(
+//                 await fs.promises.readFile(location, "utf8")
+//             )
+//             .replace(
+//                 `//# sourceMappingURL=${file}.map`, 
+//                 `//# sourceMappingURL=${file.substring(0, file.length - 3)}.mjs.map`
+//             );
+//         await fs.promises.unlink(location);
+//         await fs.promises.writeFile(
+//             `${location.substring(0, location.length - 3)}.mjs`, 
+//             content, 
+//             "utf8"
+//         );
+//     };
+//     const mapper = async (location: string) => {
+//         const content: string = await fs.promises.readFile(location, "utf8");
+//         const parsed: {file: string } = JSON.parse(content);
+//         parsed.file = parsed.file.substring(0, parsed.file.length - 3) + ".mjs";
 
-        await fs.promises.unlink(location);
-        await fs.promises.writeFile(
-            `${location.substring(0, location.length - 7)}.mjs.map`, 
-            JSON.stringify(parsed), 
-            "utf8"
-        );
-    };
+//         await fs.promises.unlink(location);
+//         await fs.promises.writeFile(
+//             `${location.substring(0, location.length - 7)}.mjs.map`, 
+//             JSON.stringify(parsed), 
+//             "utf8"
+//         );
+//     };
 
-    const iterate = async (path: string): Promise<void> => {
-        const directory: string[] = await fs.promises.readdir(path);
-        for (const file of directory) {
-            const location: string = `${path}/${file}`;
-            const stats: fs.Stats = await fs.promises.stat(location);
+//     const iterate = async (path: string): Promise<void> => {
+//         const directory: string[] = await fs.promises.readdir(path);
+//         for (const file of directory) {
+//             const location: string = `${path}/${file}`;
+//             const stats: fs.Stats = await fs.promises.stat(location);
 
-            if (stats.isDirectory()) await iterate(location);
-            else if (location.substr(-3) === ".js")
-                await javascript(location, file);
-            else if (location.substr(-5) === ".d.ts")
-                await declaration(location);
-            else if (location.substr(-7) === ".js.map")
-                await mapper(location);
-        }
-    };
+//             if (stats.isDirectory()) await iterate(location);
+//             else if (location.substr(-3) === ".js")
+//                 await javascript(location, file);
+//             else if (location.substr(-5) === ".d.ts")
+//                 await declaration(location);
+//             else if (location.substr(-7) === ".js.map")
+//                 await mapper(location);
+//         }
+//     };
 
-    cp.execSync(`npx tsc -p tsconfig.module.json`, { stdio: "inherit" });
-    await iterate(DIST);
-}
+//     cp.execSync(`npx tsc -p tsconfig.module.json`, { stdio: "inherit" });
+//     await iterate(DIST);
+// }
 
 async function main(): Promise<void> {
     cp.execSync(`npx rimraf ${DIST}`, { stdio: "inherit" });
     await fs.promises.mkdir(DIST);
 
     await documents();
-    await module();
+    // await module();
     cp.execSync(`npx tsc -p tsconfig.json`, { stdio: "inherit" });
 }
 main();
diff --git a/package.json b/package.json
index 10b1db20..61f79596 100644
--- a/package.json
+++ b/package.json
@@ -6,11 +6,9 @@
     "email": "samchon.github@gmail.com",
     "url": "https://github.com/samchon"
   },
-  "version": "2.5.11",
-  "main": "./index.js",
-  "module": "./index.mjs",
-  "esnext": "./index.mjs",
+  "version": "2.5.12",
   "typings": "./index.d.ts",
+  "main": "./index.js",
   "scripts": {
     "api": "typedoc src --exclude \"**/+(test|benchmark)/**\" --excludeNotDocumented --plugin typedoc-plugin-external-module-name --plugin typedoc-plugin-exclude-references --out ../tstl@gh-pages/api",
     "migration": "ts-node build/migration",
diff --git a/tsconfig.module.json b/tsconfig.module.json
deleted file mode 100644
index 088e4316..00000000
--- a/tsconfig.module.json
+++ /dev/null
@@ -1,8 +0,0 @@
-{
-    "extends": "./tsconfig.json",
-    "compilerOptions": {
-        "target": "ES2015",
-        "module": "ES2020",
-        "downlevelIteration": false
-    }
-}
\ No newline at end of file