Add shared cache group to webpack config & manifest.in

Author: xhlulu

{{cookiecutter.project_shortname}}/MANIFEST.in

@@ -2,6 +2,8 @@ include {{cookiecutter.project_shortname}}/{{cookiecutter.project_shortname}}.mi
 include {{cookiecutter.project_shortname}}/{{cookiecutter.project_shortname}}.min.js.map
 include {{cookiecutter.project_shortname}}/async-*.js
 include {{cookiecutter.project_shortname}}/async-*.js.map
+include {{cookiecutter.project_shortname}}/*-shared.js
+include {{cookiecutter.project_shortname}}/*-shared.js.map
 include {{cookiecutter.project_shortname}}/metadata.json
 include {{cookiecutter.project_shortname}}/package-info.json
 include README.md

{{cookiecutter.project_shortname}}/webpack.config.js

@@ -102,6 +102,12 @@ module.exports = (env, argv) => {
                         name(module, chunks, cacheGroupKey) {
                             return `${cacheGroupKey}-${chunks[0].name}`;
                         }
+                    },
+                    shared: {
+                        chunks: 'all',
+                        minSize: 0,
+                        minChunks: 2,
+                        name: '{{cookiecutter.project_shortname}}-shared'
                     }
                 }
             }