Issue #3100937 by bnjmnm, tedbow, xjm, lauriii: Update modernizr to 3.8.0

1 files changed, 43 insertions, 0 deletions

diff --git a/core/misc/modernizr-additional-tests.es6.js b/core/misc/modernizr-additional-tests.es6.js
new file mode 100644
index 000000000000..00fb90e936fc
--- /dev/null
+++ b/core/misc/modernizr-additional-tests.es6.js
@@ -0,0 +1,43 @@
+/**
+ * @file
+ * Provides additional Modernizr tests.
+ */
+(Modernizr => {
+  // This is a copy of Modernizr's touchevents test from version 3.3.1. Drupal
+  // core has updated Modernizr to a version newer than 3.3.1, but this newer
+  // version does not include the touchevents test in its build. Modernizr's
+  // touchevents test is deprecated, and newer versions of this test do not work
+  // properly with Drupal as it significantly changes the criteria used for
+  // determining if touchevents are supported.
+  // The most recent known-to-work version, 3.3.1 is provided here. The only
+  // changes are refactoring the code to meet Drupal's JavaScript coding
+  // standards and calling prefixes and testStyles() via the Modernizr object
+  // as they are not in scope when adding a test via Modernizr.addTest();
+  // @todo find alternative to Modernizr's deprecated touchevent test in
+  //   http://drupal.org/node/3101922
+  // @see https://github.com/Modernizr/Modernizr/blob/v3.3.1/feature-detects/touchevents.js
+  Modernizr.addTest('touchevents', () => {
+    let bool;
+
+    if (
+      'ontouchstart' in window ||
+      (window.DocumentTouch && document instanceof window.DocumentTouch)
+    ) {
+      bool = true;
+    } else {
+      // include the 'heartz' as a way to have a non matching MQ to help
+      // terminate the join https://git.io/vznFH
+      const query = [
+        '@media (',
+        Modernizr._prefixes.join('touch-enabled),('),
+        'heartz',
+        ')',
+        '{#modernizr{top:9px;position:absolute}}',
+      ].join('');
+      Modernizr.testStyles(query, node => {
+        bool = node.offsetTop === 9;
+      });
+    }
+    return bool;
+  });
+})(Modernizr);