From 46d8533feeed6ac760acdabacecb73a906e4e136 Mon Sep 17 00:00:00 2001
From: Eugene Pankov <john.pankov@gmail.com>
Date: Fri, 24 Aug 2018 23:48:20 +0200
Subject: [PATCH] startup time speedup

---
 app/lru.js               | 15 +++++++++++++++
 app/main.js              |  1 +
 app/src/entry.preload.ts |  1 +
 app/webpack.config.js    |  1 +
 4 files changed, 18 insertions(+)
 create mode 100644 app/lru.js

diff --git a/app/lru.js b/app/lru.js
new file mode 100644
index 00000000..a6bbd4e5
--- /dev/null
+++ b/app/lru.js
@@ -0,0 +1,15 @@
+var lru = require('lru-cache')({max: 256, maxAge: 250/*ms*/});
+
+var fs = require('fs');
+var origLstat = fs.realpathSync.bind(fs);
+console.log('s')
+// NB: The biggest offender of thrashing realpathSync is the node module system
+// itself, which we can't get into via any sane means.
+require('fs').realpathSync = function(p) {
+  let r = lru.get(p);
+  if (r) return r;
+
+  r = origLstat(p);
+  lru.set(p, r);
+  return r;
+};
diff --git a/app/main.js b/app/main.js
index 8ab2233d..d870d714 100644
--- a/app/main.js
+++ b/app/main.js
@@ -1,3 +1,4 @@
+require('./lru.js')
 if (process.platform == 'win32' && require('electron-squirrel-startup')) process.exit(0)
 
 const electron = require('electron')
diff --git a/app/src/entry.preload.ts b/app/src/entry.preload.ts
index b4582a4d..4c847648 100644
--- a/app/src/entry.preload.ts
+++ b/app/src/entry.preload.ts
@@ -1,3 +1,4 @@
+import '../lru.js'
 import 'source-sans-pro'
 import 'font-awesome/css/font-awesome.css'
 import 'ngx-toastr/toastr.css'
diff --git a/app/webpack.config.js b/app/webpack.config.js
index f4b5ba04..610ad172 100644
--- a/app/webpack.config.js
+++ b/app/webpack.config.js
@@ -64,6 +64,7 @@ module.exports = {
     'child_process': 'commonjs child_process',
     'electron': 'commonjs electron',
     'electron-is-dev': 'commonjs electron-is-dev',
+    'fs': 'commonjs fs',
     'ngx-toastr': 'commonjs ngx-toastr',
     'module': 'commonjs module',
     'mz': 'commonjs mz',