moment自体をexternalsで追い出す

package.json

@@ -23,7 +23,6 @@
     "laravel-mix": "^4.0.0",
     "laravel-mix-bundle-analyzer": "^1.0.2",
     "lint-staged": "^8.1.5",
-    "moment-locales-webpack-plugin": "^1.2.0",
     "open-iconic": "^1.1.1",
     "popper.js": "^1.14.7",
     "resolve-url-loader": "^2.3.1",

webpack.mix.js

@@ -1,6 +1,5 @@
 const mix = require('laravel-mix');
 require('laravel-mix-bundle-analyzer')
-const MomentLocalesPlugin = require('moment-locales-webpack-plugin');
 
 /*
  |--------------------------------------------------------------------------
@@ -29,11 +28,9 @@ mix.js('resources/assets/js/app.js', 'public/js')
     .extract(['chart.js', 'chartjs-color', 'color-name', 'moment', 'cal-heatmap', 'd3'], 'public/js/vendor/chart')
     .version()
     .webpackConfig(webpack => ({
-        plugins: [
-            new MomentLocalesPlugin({
-                localesToKeep: ['ja']
-            })
-        ]
+        externals: {
+            moment: 'moment'
+        }
     }));
 
 if (process.argv.includes('-a')) {

yarn.lock

@@ -4589,11 +4589,6 @@ lodash.defaults@^4.0.0:
   resolved "https://registry.yarnpkg.com/lodash.defaults/-/lodash.defaults-4.2.0.tgz#d09178716ffea4dde9e5fb7b37f6f0802274580c"
   integrity sha1-0JF4cW/+pN3p5ft7N/bwgCJ0WAw=
 
-lodash.difference@^4.5.0:
-  version "4.5.0"
-  resolved "https://registry.yarnpkg.com/lodash.difference/-/lodash.difference-4.5.0.tgz#9ccb4e505d486b91651345772885a2df27fd017c"
-  integrity sha1-nMtOUF1Ia5FlE0V3KIWi3yf9AXw=
-
 lodash.isarguments@^3.0.0:
   version "3.1.0"
   resolved "https://registry.yarnpkg.com/lodash.isarguments/-/lodash.isarguments-3.1.0.tgz#2f573d85c6a24289ff00663b491c1d338ff3458a"
@@ -5007,13 +5002,6 @@ mkdirp@^0.5.1, mkdirp@~0.5.1:
   dependencies:
     minimist "0.0.8"
 
-moment-locales-webpack-plugin@^1.2.0:
-  version "1.2.0"
-  resolved "https://registry.yarnpkg.com/moment-locales-webpack-plugin/-/moment-locales-webpack-plugin-1.2.0.tgz#9af83876a44053706b868ceece5119584d10d7aa"
-  integrity sha512-QAi5v0OlPUP7GXviKMtxnpBAo8WmTHrUNN7iciAhNOEAd9evCOvuN0g1N7ThIg3q11GLCkjY1zQ2saRcf/43nQ==
-  dependencies:
-    lodash.difference "^4.5.0"
-
 moment@^2.10.2:
   version "2.24.0"
   resolved "https://registry.yarnpkg.com/moment/-/moment-2.24.0.tgz#0d055d53f5052aa653c9f6eb68bb5d12bf5c2b5b"