[#8] Add a configure param to choose execution priority (#9)

* Add param and logic

* Update doc

* 1.1.0

Author: marco-prontera

README.md

@@ -2,8 +2,9 @@
 A Vite plugin that takes the CSS and adds it to the page through the JS. For those who want a single JS file.
 
 ## How does it work
-Essentially what it does is take all the CSS generated by the build process and add it through javascript. 
+Essentially what it does is take all the CSS generated by the build process and add it via JavaScript.
 The CSS file is therefore not generated and the declaration in the generated HTML file is also removed.
+You can also configure when the CSS injection will be executed (before or after your app code).
 
 ## Installation
 ```
@@ -16,7 +17,23 @@ import cssInjectedByJsPlugin from 'vite-plugin-css-injected-by-js'
 
 export default {
   plugins: [
-    cssInJsPlugin(),
+    cssInjectedByJsPlugin(),
+  ]
+}
+```
+### Configurations
+When you add the plugin, you can provide a configuration object.
+For now, you can configure only when the injection of CSS is done at execution time ```topExecutionPriority```.
+#### topExecutionPriority
+The default behavior adds the injection of CSS before your bundle code.
+If you provide ```topExecutionPriority``` equal to: ```false```  the code of injection will be added after the bundle code.
+This is an example:
+```ts
+import cssInjectedByJsPlugin from 'vite-plugin-css-injected-by-js'
+
+export default {
+  plugins: [
+    cssInjectedByJsPlugin({topExecutionPriority: false}),
   ]
 }
 ```

package-lock.json

@@ -1,6 +1,6 @@
 {
   "name": "vite-plugin-css-injected-by-js",
-  "version": "1.0.1",
+  "version": "1.1.0",
   "description": "A Vite plugin that takes the CSS and adds it to the page through the JS. For those who want a single JS file.",
   "main": "dist/plugin.js",
   "scripts": {

package.json

@@ -5,7 +5,7 @@ import { IndexHtmlTransformContext, IndexHtmlTransformResult, Plugin } from 'vit
  *
  * @return {Plugin}
  */
-export default function cssInjectedByJsPlugin(): Plugin {
+export default function cssInjectedByJsPlugin({topExecutionPriority} = { topExecutionPriority: true }): Plugin {
 
     return {
         apply: 'build',
@@ -40,8 +40,15 @@ export default function cssInjectedByJsPlugin(): Plugin {
 
                     if (chunk.type === 'chunk' && chunk.fileName.includes('.js')) {
 
-                        //IIFE http://benalman.com/news/2010/11/immediately-invoked-function-expression/
-                        chunk.code += `(function(){ try {var elementStyle = document.createElement('style'); elementStyle.innerText = \`${styleCode}\`; document.head.appendChild(elementStyle);} catch(e) {console.error(e, 'vite-plugin-css-injected-by-js: can\\'t add the style.');} })()`;
+                        let topCode: string = '';
+                        let bottomCode: string = '';
+                        if (topExecutionPriority) {
+                            bottomCode = chunk.code;
+                        } else {
+                            topCode = chunk.code;
+                        }
+
+                        chunk.code = `${topCode}(function(){ try {var elementStyle = document.createElement('style'); elementStyle.innerText = \`${styleCode}\`; document.head.appendChild(elementStyle);} catch(e) {console.error(e, 'vite-plugin-css-injected-by-js: error when trying to add the style.');} })();${bottomCode}`;
 
                         break;