fix(core feature-detection): Fix loading of modernizr script.

src/core/feature-detection.js

@@ -18,15 +18,14 @@
     }
 
     // Get the current script tag's URL.
-    // See: https://stackoverflow.com/a/984656/1337474
-    const scripts = document.getElementsByTagName("script");
-    const script = scripts[scripts.length - 1];
-    let script_url = script.src;
+    const script_url = document.currentScript.src;
     // Get the base URL of the current script tag's URL.
-    script_url = script_url.substring(0, script_url.lastIndexOf("/")) + "/";
+    let base_url = script_url.substring(0, script_url.lastIndexOf("/")) + "/";
+    // The modernizr script is located outside the chunks directory.
+    base_url = base_url.replace("chunks/", "");
 
     // Inject a new one with the modernizr bundle.
     const script_tag = document.createElement("script");
-    script_tag.src = script_url + "modernizr.min.js";
+    script_tag.src = base_url + "modernizr.min.js";
     document.getElementsByTagName("head")[0].appendChild(script_tag);
 })();

src/core/logging.js

@@ -46,11 +46,8 @@ function ConsoleWriter() {}
 ConsoleWriter.prototype = {
     output: function (log_name, level, messages) {
         if (log_name) messages.unshift(log_name + ":");
-        if (level <= Level.DEBUG) {
-            // console.debug exists but is deprecated
-            messages.unshift("[DEBUG]");
-            console.log.apply(console, messages);
-        } else if (level <= Level.INFO) console.info.apply(console, messages);
+        if (level <= Level.DEBUG) console.debug.apply(console, messages);
+        else if (level <= Level.INFO) console.info.apply(console, messages);
         else if (level <= Level.WARN) console.warn.apply(console, messages);
         else console.error.apply(console, messages);
     },

src/core/registry.js

@@ -174,9 +174,22 @@ const registry = {
             }
         }
 
+        // Clean up selectors:
+        // - Remove whitespace,
+        // - Remove trailing commas,
+        // - Join to selecto string.
+        const selector_string = selectors.map(
+            (selector) => selector.trim().replace(/,$/, "")
+        ).join(",");
+
+        // Exit, if no selector.
+        if (!selector_string) {
+            return;
+        }
+
         let matches = dom.querySelectorAllAndMe(
             content,
-            selectors.map((it) => it.trim().replace(/,$/, "")).join(",")
+            selector_string
         );
         matches = matches.filter((el) => {
             // Filter out patterns:

src/core/registry.test.js

@@ -104,4 +104,16 @@ describe("pat-registry: The registry for patterns", function () {
 
         done();
     });
+
+    it("Does nothing with Patterns without a trigger.", function () {
+        registry.register(
+            {
+                name: "pattern-without-trigger"
+            }
+        )
+
+        const el = document.createElement("div");
+        expect(() => { registry.scan(el) }).not.toThrow(DOMException);
+    });
+
 });