refactor: using insert option directly

Author: ScriptedAlchemy

src/index.js

@@ -321,7 +321,6 @@ class MiniCssExtractPlugin {
                 contentHashType: MODULE_TYPE,
               }
             );
-            const { insert } = this.options;
             return Template.asString([
               source,
               '',
@@ -377,9 +376,9 @@ class MiniCssExtractPlugin {
                         '}',
                       ])
                     : '',
-                  insert
-                    ? Template.asString([insert, 'insert(linkTag);'])
-                    : 'var head = document.getElementsByTagName("head")[0]; head.appendChild(linkTag)',
+                  this.options.insert
+                    ? Template.asString([this.options.insert, 'insert(linkTag);'])
+                    : 'var head = document.getElementsByTagName("head")[0]; head.appendChild(linkTag)'
                 ]),
                 '}).then(function() {',
                 Template.indent(['installedCssChunks[chunkId] = 0;']),