migrate to "export default"

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

src/metrics.js

@@ -3,25 +3,20 @@ import assert from 'node:assert';
 import BoxError from './boxerror.js';
 import constants from './constants.js';
 import debugModule from 'debug';
-import * as docker from './docker.js';
+import docker from './docker.js';
 import fs from 'node:fs';
 import net from 'node:net';
-import * as network from './network.js';
+import network from './network.js';
 import os from 'node:os';
 import { Readable } from 'node:stream';
 import safe from 'safetydance';
 import shellModule from './shell.js';
 import superagent from '@cloudron/superagent';
-import * as _ from './underscore.js';
+import _ from './underscore.js';
 
 const debug = debugModule('box:metrics');
 const shell = shellModule('metrics');
 
-export {
-    get,
-    getStream,
-    sendToGraphite
-};
 
 function translateContainerStatsSync(stats) {
     assert.strictEqual(typeof stats, 'object');
@@ -500,3 +495,9 @@ async function getStream(options) {
 
     return metricsStream;
 }
+
+export default {
+    get,
+    getStream,
+    sendToGraphite
+};