From ea9bc832b304567c6b935936d694da97b876bf9c Mon Sep 17 00:00:00 2001
From: Jordan Eldredge <jordan@jordaneldredge.com>
Date: Thu, 15 Mar 2018 22:24:30 -0700
Subject: [PATCH] Lazy load jsmediatags

---
 config/webpack.common.js |  1 +
 js/fileUtils.js          | 27 ++++++++++++++++++---------
 2 files changed, 19 insertions(+), 9 deletions(-)

diff --git a/config/webpack.common.js b/config/webpack.common.js
index feaddb10..ac7932a7 100644
--- a/config/webpack.common.js
+++ b/config/webpack.common.js
@@ -74,6 +74,7 @@ module.exports = {
   },
   output: {
     filename: "[name]-[hash].js",
+    chunkFilename: "[name]-[hash].js",
     publicPath: "/",
     path: path.resolve(__dirname, "../built")
   }
diff --git a/js/fileUtils.js b/js/fileUtils.js
index f54ea1ac..899cc2f7 100644
--- a/js/fileUtils.js
+++ b/js/fileUtils.js
@@ -1,5 +1,4 @@
 import invariant from "invariant";
-import jsmediatags from "jsmediatags/dist/jsmediatags";
 
 export function genMediaTags(file) {
   invariant(
@@ -11,14 +10,24 @@ export function genMediaTags(file) {
     file = `${location.protocol}//${location.host}${location.pathname}${file}`;
   }
   return new Promise((resolve, reject) => {
-    try {
-      jsmediatags.read(file, { onSuccess: resolve, onError: reject });
-    } catch (e) {
-      // Possibly jsmediatags could not find a parser for this file?
-      // Nothing to do.
-      // Consider removing this after https://github.com/aadsm/jsmediatags/issues/83 is resolved.
-      reject(e);
-    }
+    require.ensure(
+      ["jsmediatags/dist/jsmediatags"],
+      require => {
+        const jsmediatags = require("jsmediatags/dist/jsmediatags");
+        try {
+          jsmediatags.read(file, { onSuccess: resolve, onError: reject });
+        } catch (e) {
+          // Possibly jsmediatags could not find a parser for this file?
+          // Nothing to do.
+          // Consider removing this after https://github.com/aadsm/jsmediatags/issues/83 is resolved.
+          reject(e);
+        }
+      },
+      () => {
+        // The dependency failed to load
+      },
+      "jsmediatags"
+    );
   });
 }