diff --git a/client/modules/operation/format.js b/client/modules/operation/format.mjs
similarity index 63%
rename from client/modules/operation/format.js
rename to client/modules/operation/format.mjs
index ffed26f4..c639799e 100644
--- a/client/modules/operation/format.js
+++ b/client/modules/operation/format.mjs
@@ -1,6 +1,4 @@
-'use strict';
-
-module.exports = (operation, from, to) => {
+export const format = (operation, from, to) => {
     if (!to)
         return `${operation} ${from}`;
     
diff --git a/client/modules/operation/get-next-current-name.js b/client/modules/operation/get-next-current-name.mjs
similarity index 76%
rename from client/modules/operation/get-next-current-name.js
rename to client/modules/operation/get-next-current-name.mjs
index d0f120d5..63445888 100644
--- a/client/modules/operation/get-next-current-name.js
+++ b/client/modules/operation/get-next-current-name.mjs
@@ -1,11 +1,9 @@
-'use strict';
-
-const currify = require('currify');
+import currify from 'currify';
 
 const not = currify((array, value) => !array.includes(value));
 const notOneOf = currify((a, b) => a.filter(not(b)));
 
-module.exports = (currentName, names, removedNames) => {
+export const getNextCurrentName = (currentName, names, removedNames) => {
     const i = names.indexOf(currentName);
     
     const nextNames = notOneOf(names, removedNames);
diff --git a/client/modules/operation/index.mjs b/client/modules/operation/index.mjs
index 8e8149e5..a2e7c0e7 100644
--- a/client/modules/operation/index.mjs
+++ b/client/modules/operation/index.mjs
@@ -5,9 +5,9 @@ import exec from 'execon';
 import load from 'load.js';
 import {tryToCatch} from 'try-to-catch';
 import {encode} from '../../../common/entity.js';
-import removeExtension from './remove-extension.js';
+import {removeExtension} from './remove-extension.mjs';
 import {setListeners} from './set-listeners.mjs';
-import getNextCurrentName from './get-next-current-name.js';
+import {getNextCurrentName} from './get-next-current-name.mjs';
 
 const {DOM, CloudCmd} = globalThis;
 
diff --git a/client/modules/operation/remove-extension.js b/client/modules/operation/remove-extension.mjs
similarity index 75%
rename from client/modules/operation/remove-extension.js
rename to client/modules/operation/remove-extension.mjs
index 9aee274d..e6ce2c46 100644
--- a/client/modules/operation/remove-extension.js
+++ b/client/modules/operation/remove-extension.mjs
@@ -1,8 +1,6 @@
-'use strict';
+import {getExt} from '#common/util';
 
-const {getExt} = require('#common/util');
-
-module.exports = (name) => {
+export const removeExtension = (name) => {
     const ext = getExtension(name);
     
     return name.replace(ext, '');
diff --git a/client/modules/operation/remove-extension.spec.js b/client/modules/operation/remove-extension.spec.mjs
similarity index 87%
rename from client/modules/operation/remove-extension.spec.js
rename to client/modules/operation/remove-extension.spec.mjs
index 9896e735..8dbacb61 100644
--- a/client/modules/operation/remove-extension.spec.js
+++ b/client/modules/operation/remove-extension.spec.mjs
@@ -1,7 +1,5 @@
-'use strict';
-
-const test = require('supertape');
-const removeExtension = require(`./remove-extension`);
+import test from 'supertape';
+import {removeExtension} from './remove-extension.mjs';
 
 test('cloudcmd: client: modules: operation: removeExtension: .tar.gz', (t) => {
     const name = 'hello';
diff --git a/client/modules/operation/set-listeners.mjs b/client/modules/operation/set-listeners.mjs
index d5052cff..355aee79 100644
--- a/client/modules/operation/set-listeners.mjs
+++ b/client/modules/operation/set-listeners.mjs
@@ -1,7 +1,7 @@
 /* global DOM */
 import forEachKey from 'for-each-key';
 import wraptile from 'wraptile';
-import format from './format.js';
+import {format} from './format.mjs';
 
 const {Dialog, Images} = DOM;