Fixes #76

src/PrismLoader.js

@@ -13,7 +13,7 @@ module.exports = function(language, options = {}) {
   // aliasing should ignore diff-
   let aliasedName = PrismAlias(diffRemovedRawName);
 
-  if(!Prism.languages[ aliasedName ]) {
+  if(!Prism.languages[ aliasedName ]) { // matches `diff` too
     PrismLoader(aliasedName);
   }
 
@@ -30,10 +30,11 @@ module.exports = function(language, options = {}) {
 
   if(!Prism.languages.diff) {
     PrismLoader("diff");
-    // Bundled Plugin
-    require("prismjs/plugins/diff-highlight/prism-diff-highlight");
   }
 
+  // Bundled Plugin
+  require("prismjs/plugins/diff-highlight/prism-diff-highlight");
+
   // Store into with aliased keys
   //   ts -> diff-typescript
   //   js -> diff-javascript

test/11tyjs-diff/test.11ty.js

@@ -1,4 +1,5 @@
 module.exports = function(data) {
-  let result = this.highlight("diff-js", "-var test;");
-  return result;
+  let result1 = this.highlight("diff", "-var test;");
+  let result2 = this.highlight("diff-js", "-var test;");
+  return result1 + "\n" + result2;
 };

test/JavaScriptFunctionTest.js

@@ -20,5 +20,6 @@ test("JavaScript Function Diff", async t => {
 
   t.is(json.length, 1);
   let rendered = json[0].content;
-	t.is(`<pre class="language-diff-js"><code class="language-diff-js"><span class="token deleted-sign deleted language-js"><span class="token prefix deleted">-</span><span class="token keyword">var</span> test<span class="token punctuation">;</span></span></code></pre>`, rendered);
+	t.is(`<pre class="language-diff"><code class="language-diff"><span class="token deleted-sign deleted"><span class="token prefix deleted">-</span><span class="token line">var test;</span></span></code></pre>
+<pre class="language-diff-js"><code class="language-diff-js"><span class="token deleted-sign deleted language-js"><span class="token prefix deleted">-</span><span class="token keyword">var</span> test<span class="token punctuation">;</span></span></code></pre>`, rendered);
 });