refactor: remove logical operators from runtime

handle logic operator at compiler level

Author: ScriptedAlchemy

src/index.js

@@ -377,9 +377,9 @@ class MiniCssExtractPlugin {
                         '}',
                       ])
                     : '',
-                  `var insert = ${insert};`,
-                  `if (insert) { insert(linkTag); }`,
-                  `else {var head = document.getElementsByTagName("head")[0]; head.appendChild(linkTag);} `,
+                  insert
+                    ? 'insert(linkTag);'
+                    : 'var head = document.getElementsByTagName("head")[0]; head.appendChild(linkTag)',
                 ]),
                 '}).then(function() {',
                 Template.indent(['installedCssChunks[chunkId] = 0;']),

src/plugin-options.json

@@ -16,14 +16,7 @@
     },
     "insert": {
       "description": "Inserts `<link>` at the given position (https://github.com/faceyspacey/extract-css-chunks-webpack-pluginn#insert).",
-      "anyOf": [
-        {
-          "type": "string"
-        },
-        {
-          "instanceof": "Function"
-        }
-      ]
+      "instanceof": "Function"
     }
   }
 }