feat: add meta attribute for html tags

BREAKING CHANGE: Plugins adding additional assetTags should provide a meta attribute

index.js

@@ -717,6 +717,7 @@ function hookIntoCompiler (compiler, options, plugin) {
     return jsAssets.map(scriptAsset => ({
       tagName: 'script',
       voidTag: false,
+      meta: { plugin: 'html-webpack-plugin' },
       attributes: {
         defer: options.scriptLoading !== 'blocking',
         src: scriptAsset
@@ -733,6 +734,7 @@ function hookIntoCompiler (compiler, options, plugin) {
     return cssAssets.map(styleAsset => ({
       tagName: 'link',
       voidTag: true,
+      meta: { plugin: 'html-webpack-plugin' },
       attributes: {
         href: styleAsset,
         rel: 'stylesheet'
@@ -755,6 +757,7 @@ function hookIntoCompiler (compiler, options, plugin) {
       return [{
         tagName: 'base',
         voidTag: true,
+        meta: { plugin: 'html-webpack-plugin' },
         attributes: (typeof baseOption === 'string') ? {
           href: baseOption
         } : baseOption
@@ -797,6 +800,7 @@ function hookIntoCompiler (compiler, options, plugin) {
       return {
         tagName: 'meta',
         voidTag: true,
+        meta: { plugin: 'html-webpack-plugin' },
         attributes: metaTagAttributes
       };
     });
@@ -814,6 +818,7 @@ function hookIntoCompiler (compiler, options, plugin) {
     return [{
       tagName: 'link',
       voidTag: true,
+      meta: { plugin: 'html-webpack-plugin' },
       attributes: {
         rel: 'icon',
         href: faviconPath

lib/html-tags.js

@@ -54,13 +54,17 @@ function htmlTagObjectToString (tagDefinition, xhtml) {
  *
  * @param {string} [innerHTML]
  *
+ * @param {{[attributeName: string]: string|boolean}} [meta]
+ * meta information about the tag e.g. `{ 'pluhin': 'html-webpack-plugin' }`
+ *
  * @returns {HtmlTagObject}
  */
-function createHtmlTagObject (tagName, attributes, innerHTML) {
+function createHtmlTagObject (tagName, attributes, innerHTML, meta) {
   return {
     tagName: tagName,
     voidTag: voidTags.indexOf(tagName) !== -1,
     attributes: attributes || {},
+    meta: meta || {},
     innerHTML: innerHTML
   };
 }

typings.d.ts

@@ -278,5 +278,13 @@ declare namespace HtmlWebpackPlugin {
      * @see https://www.w3.org/TR/html5/syntax.html#void-elements
      */
     voidTag: boolean;
+    /**
+     * Meta information about the tag
+     * E.g. `{'plugin': 'html-webpack-plugin'}`
+     */
+    meta: {
+      plugin?: string,
+      [metaAttributeName: string]: any;
+    };
   }
 }