[Glitch] Dont use CommonJS (require, module.exports) anywhere

Port 955179fc55 to glitch-soc

Signed-off-by: Claire <claire.github-309c@sitedethib.com>

app/javascript/flavours/glitch/performance.js

@@ -2,9 +2,8 @@
 // Tools for performance debugging, only enabled in development mode.
 // Open up Chrome Dev Tools, then Timeline, then User Timing to see output.
 // Also see config/webpack/loaders/mark.js for the webpack loader marks.
-//
 
-let marky;
+import * as marky from 'marky';
 
 if (process.env.NODE_ENV === 'development') {
   if (typeof performance !== 'undefined' && performance.setResourceTimingBufferSize) {
@@ -12,8 +11,7 @@ if (process.env.NODE_ENV === 'development') {
     // See: https://bugzilla.mozilla.org/show_bug.cgi?id=1331135
     performance.setResourceTimingBufferSize(Infinity);
   }
-  // eslint-disable-next-line import/no-extraneous-dependencies
-  marky = require('marky');
+
   // allows us to easily do e.g. ReactPerf.printWasted() while debugging
   //window.ReactPerf = require('react-addons-perf');
   //window.ReactPerf.start();