migrate to "export default"

also, set no-use-before-define in linter

src/network.js

@@ -1,44 +1,21 @@
 import assert from 'node:assert';
 import BoxError from './boxerror.js';
 import constants from './constants.js';
-import * as cron from './cron.js';
+import cron from './cron.js';
 import fs from 'node:fs';
-import * as ipaddr from './ipaddr.js';
+import ipaddr from './ipaddr.js';
 import path from 'node:path';
 import paths from './paths.js';
 import safe from 'safetydance';
-import * as settings from './settings.js';
+import settings from './settings.js';
 import shellModule from './shell.js';
-import * as noopProvider from './network/noop.js';
-import * as fixedProvider from './network/fixed.js';
-import * as networkInterfaceProvider from './network/network-interface.js';
-import * as genericProvider from './network/generic.js';
+import noopProvider from './network/noop.js';
+import fixedProvider from './network/fixed.js';
+import networkInterfaceProvider from './network/network-interface.js';
+import genericProvider from './network/generic.js';
 
 const shell = shellModule('network');
 
-export {
-    testIPv4Config,
-    testIPv6Config,
-
-    getBlocklist,
-    setBlocklist,
-
-    getDynamicDns,
-    setDynamicDns,
-
-    getIPv4Config,
-    setIPv4Config,
-
-    getIPv6Config,
-    setIPv6Config,
-
-    getIPv4,
-    hasIPv6,
-    getIPv6,
-    detectIP,
-
-    getDefaultInterface
-};
 
 const SET_BLOCKLIST_CMD = path.join(import.meta.dirname, 'scripts/setblocklist.sh');
 
@@ -207,3 +184,27 @@ async function getDefaultInterface() {
 
     throw new BoxError(BoxError.EXTERNAL_ERROR, 'Could not detect default interface');
 }
+
+export default {
+    testIPv4Config,
+    testIPv6Config,
+
+    getBlocklist,
+    setBlocklist,
+
+    getDynamicDns,
+    setDynamicDns,
+
+    getIPv4Config,
+    setIPv4Config,
+
+    getIPv6Config,
+    setIPv6Config,
+
+    getIPv4,
+    hasIPv6,
+    getIPv6,
+    detectIP,
+
+    getDefaultInterface
+};