diff --git a/lib/legacy/legacy-data-mixin.js b/lib/legacy/legacy-data-mixin.js
index b2a255386d..d3d84088e2 100644
--- a/lib/legacy/legacy-data-mixin.js
+++ b/lib/legacy/legacy-data-mixin.js
@@ -94,7 +94,8 @@ export const LegacyDataMixin = dedupingMixin(superClass => {
       // undefined or not. Multi-property observers must have all arguments defined
       if (this._legacyUndefinedCheck && vals.length > 1) {
         for (let i=0; i<vals.length; i++) {
-          if (vals[i] === undefined) {
+          if (vals[i] === undefined || 
+              (args[i].wildcard && vals[i].base === undefined)) {
             // Break out of effect's control flow; will be caught in
             // wrapped property effect function below
             const name = args[i].name;
diff --git a/lib/mixins/element-mixin.js b/lib/mixins/element-mixin.js
index af291ac45b..7c28589f9a 100644
--- a/lib/mixins/element-mixin.js
+++ b/lib/mixins/element-mixin.js
@@ -672,9 +672,9 @@ export const ElementMixin = dedupingMixin(base => {
       if (n.attachShadow) {
         if (dom) {
           if (!n.shadowRoot) {
-            n.attachShadow({mode: 'open'});
+            n.attachShadow({mode: 'open', shadyUpgradeFragment: dom});
+            n.shadowRoot.appendChild(dom);
           }
-          n.shadowRoot.appendChild(dom);
           if (syncInitialRender && window.ShadyDOM) {
             ShadyDOM.flushInitial(n.shadowRoot);
           }
diff --git a/lib/utils/templatize.js b/lib/utils/templatize.js
index 9f05135470..7d4ed9dd3f 100644
--- a/lib/utils/templatize.js
+++ b/lib/utils/templatize.js
@@ -360,11 +360,14 @@ function createTemplatizerClass(template, templateInfo, options) {
 }
 
 /**
+ * Adds propagate effects from the template to the template instance for
+ * properties that the host binds to the template using the `_host_` prefix.
+ * 
  * @suppress {missingProperties} class.prototype is not defined for some reason
  */
 function addPropagateEffects(template, templateInfo, options) {
   let userForwardHostProp = options.forwardHostProp;
-  if (userForwardHostProp) {
+  if (userForwardHostProp && templateInfo.hasHostProps) {
     // Provide data API and property effects on memoized template class
     let klass = templateInfo.templatizeTemplateClass;
     if (!klass) {
@@ -423,6 +426,11 @@ function addNotifyEffects(klass, template, templateInfo, options) {
   }
   if (options.forwardHostProp && template.__dataHost) {
     for (let hprop in hostProps) {
+      // As we're iterating hostProps in this function, note whether
+      // there were any, for an optimization in addPropagateEffects
+      if (!templateInfo.hasHostProps) {
+        templateInfo.hasHostProps = true;
+      }
       klass.prototype._addPropertyEffect(hprop,
         klass.prototype.PROPERTY_EFFECT_TYPES.NOTIFY,
         {fn: createNotifyHostPropEffect()});
diff --git a/package-lock.json b/package-lock.json
index 0f9da6a0cf..dcee6ea6b1 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -35,73 +35,6 @@
         "source-map": "^0.5.0"
       },
       "dependencies": {
-        "@babel/generator": {
-          "version": "7.4.0",
-          "resolved": "https://registry.npmjs.org/@babel/generator/-/generator-7.4.0.tgz",
-          "integrity": "sha512-/v5I+a1jhGSKLgZDcmAUZ4K/VePi43eRkUs3yePW1HB1iANOD5tqJXwGSG4BZhSksP8J9ejSlwGeTiiOFZOrXQ==",
-          "dev": true,
-          "requires": {
-            "@babel/types": "^7.4.0",
-            "jsesc": "^2.5.1",
-            "lodash": "^4.17.11",
-            "source-map": "^0.5.0",
-            "trim-right": "^1.0.1"
-          }
-        },
-        "@babel/helper-split-export-declaration": {
-          "version": "7.4.0",
-          "resolved": "https://registry.npmjs.org/@babel/helper-split-export-declaration/-/helper-split-export-declaration-7.4.0.tgz",
-          "integrity": "sha512-7Cuc6JZiYShaZnybDmfwhY4UYHzI6rlqhWjaIqbsJGsIqPimEYy5uh3akSRLMg65LSdSEnJ8a8/bWQN6u2oMGw==",
-          "dev": true,
-          "requires": {
-            "@babel/types": "^7.4.0"
-          }
-        },
-        "@babel/parser": {
-          "version": "7.4.3",
-          "resolved": "https://registry.npmjs.org/@babel/parser/-/parser-7.4.3.tgz",
-          "integrity": "sha512-gxpEUhTS1sGA63EGQGuA+WESPR/6tz6ng7tSHFCmaTJK/cGK8y37cBTspX+U2xCAue2IQVvF6Z0oigmjwD8YGQ==",
-          "dev": true
-        },
-        "@babel/template": {
-          "version": "7.4.0",
-          "resolved": "https://registry.npmjs.org/@babel/template/-/template-7.4.0.tgz",
-          "integrity": "sha512-SOWwxxClTTh5NdbbYZ0BmaBVzxzTh2tO/TeLTbF6MO6EzVhHTnff8CdBXx3mEtazFBoysmEM6GU/wF+SuSx4Fw==",
-          "dev": true,
-          "requires": {
-            "@babel/code-frame": "^7.0.0",
-            "@babel/parser": "^7.4.0",
-            "@babel/types": "^7.4.0"
-          }
-        },
-        "@babel/traverse": {
-          "version": "7.4.3",
-          "resolved": "https://registry.npmjs.org/@babel/traverse/-/traverse-7.4.3.tgz",
-          "integrity": "sha512-HmA01qrtaCwwJWpSKpA948cBvU5BrmviAief/b3AVw936DtcdsTexlbyzNuDnthwhOQ37xshn7hvQaEQk7ISYQ==",
-          "dev": true,
-          "requires": {
-            "@babel/code-frame": "^7.0.0",
-            "@babel/generator": "^7.4.0",
-            "@babel/helper-function-name": "^7.1.0",
-            "@babel/helper-split-export-declaration": "^7.4.0",
-            "@babel/parser": "^7.4.3",
-            "@babel/types": "^7.4.0",
-            "debug": "^4.1.0",
-            "globals": "^11.1.0",
-            "lodash": "^4.17.11"
-          }
-        },
-        "@babel/types": {
-          "version": "7.4.0",
-          "resolved": "https://registry.npmjs.org/@babel/types/-/types-7.4.0.tgz",
-          "integrity": "sha512-aPvkXyU2SPOnztlgo8n9cEiXW755mgyvueUPcpStqdzoSPm0fjO0vQBjLkt3JKJW7ufikfcnMTTPsN1xaTsBPA==",
-          "dev": true,
-          "requires": {
-            "esutils": "^2.0.2",
-            "lodash": "^4.17.11",
-            "to-fast-properties": "^2.0.0"
-          }
-        },
         "json5": {
           "version": "2.1.0",
           "resolved": "https://registry.npmjs.org/json5/-/json5-2.1.0.tgz",
@@ -126,14 +59,14 @@
       }
     },
     "@babel/generator": {
-      "version": "7.3.2",
-      "resolved": "https://registry.npmjs.org/@babel/generator/-/generator-7.3.2.tgz",
-      "integrity": "sha512-f3QCuPppXxtZOEm5GWPra/uYUjmNQlu9pbAD8D/9jze4pTY83rTtB1igTBSwvkeNlC5gR24zFFkz+2WHLFQhqQ==",
+      "version": "7.4.0",
+      "resolved": "https://registry.npmjs.org/@babel/generator/-/generator-7.4.0.tgz",
+      "integrity": "sha512-/v5I+a1jhGSKLgZDcmAUZ4K/VePi43eRkUs3yePW1HB1iANOD5tqJXwGSG4BZhSksP8J9ejSlwGeTiiOFZOrXQ==",
       "dev": true,
       "requires": {
-        "@babel/types": "^7.3.2",
+        "@babel/types": "^7.4.0",
         "jsesc": "^2.5.1",
-        "lodash": "^4.17.10",
+        "lodash": "^4.17.11",
         "source-map": "^0.5.0",
         "trim-right": "^1.0.1"
       },
@@ -174,70 +107,6 @@
         "@babel/helper-hoist-variables": "^7.4.0",
         "@babel/traverse": "^7.4.0",
         "@babel/types": "^7.4.0"
-      },
-      "dependencies": {
-        "@babel/generator": {
-          "version": "7.4.0",
-          "resolved": "https://registry.npmjs.org/@babel/generator/-/generator-7.4.0.tgz",
-          "integrity": "sha512-/v5I+a1jhGSKLgZDcmAUZ4K/VePi43eRkUs3yePW1HB1iANOD5tqJXwGSG4BZhSksP8J9ejSlwGeTiiOFZOrXQ==",
-          "dev": true,
-          "requires": {
-            "@babel/types": "^7.4.0",
-            "jsesc": "^2.5.1",
-            "lodash": "^4.17.11",
-            "source-map": "^0.5.0",
-            "trim-right": "^1.0.1"
-          }
-        },
-        "@babel/helper-split-export-declaration": {
-          "version": "7.4.0",
-          "resolved": "https://registry.npmjs.org/@babel/helper-split-export-declaration/-/helper-split-export-declaration-7.4.0.tgz",
-          "integrity": "sha512-7Cuc6JZiYShaZnybDmfwhY4UYHzI6rlqhWjaIqbsJGsIqPimEYy5uh3akSRLMg65LSdSEnJ8a8/bWQN6u2oMGw==",
-          "dev": true,
-          "requires": {
-            "@babel/types": "^7.4.0"
-          }
-        },
-        "@babel/parser": {
-          "version": "7.4.3",
-          "resolved": "https://registry.npmjs.org/@babel/parser/-/parser-7.4.3.tgz",
-          "integrity": "sha512-gxpEUhTS1sGA63EGQGuA+WESPR/6tz6ng7tSHFCmaTJK/cGK8y37cBTspX+U2xCAue2IQVvF6Z0oigmjwD8YGQ==",
-          "dev": true
-        },
-        "@babel/traverse": {
-          "version": "7.4.3",
-          "resolved": "https://registry.npmjs.org/@babel/traverse/-/traverse-7.4.3.tgz",
-          "integrity": "sha512-HmA01qrtaCwwJWpSKpA948cBvU5BrmviAief/b3AVw936DtcdsTexlbyzNuDnthwhOQ37xshn7hvQaEQk7ISYQ==",
-          "dev": true,
-          "requires": {
-            "@babel/code-frame": "^7.0.0",
-            "@babel/generator": "^7.4.0",
-            "@babel/helper-function-name": "^7.1.0",
-            "@babel/helper-split-export-declaration": "^7.4.0",
-            "@babel/parser": "^7.4.3",
-            "@babel/types": "^7.4.0",
-            "debug": "^4.1.0",
-            "globals": "^11.1.0",
-            "lodash": "^4.17.11"
-          }
-        },
-        "@babel/types": {
-          "version": "7.4.0",
-          "resolved": "https://registry.npmjs.org/@babel/types/-/types-7.4.0.tgz",
-          "integrity": "sha512-aPvkXyU2SPOnztlgo8n9cEiXW755mgyvueUPcpStqdzoSPm0fjO0vQBjLkt3JKJW7ufikfcnMTTPsN1xaTsBPA==",
-          "dev": true,
-          "requires": {
-            "esutils": "^2.0.2",
-            "lodash": "^4.17.11",
-            "to-fast-properties": "^2.0.0"
-          }
-        },
-        "source-map": {
-          "version": "0.5.7",
-          "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.5.7.tgz",
-          "integrity": "sha1-igOdLRAh0i0eoUyA2OpGi6LvP8w=",
-          "dev": true
-        }
       }
     },
     "@babel/helper-define-map": {
@@ -249,19 +118,6 @@
         "@babel/helper-function-name": "^7.1.0",
         "@babel/types": "^7.4.0",
         "lodash": "^4.17.11"
-      },
-      "dependencies": {
-        "@babel/types": {
-          "version": "7.4.0",
-          "resolved": "https://registry.npmjs.org/@babel/types/-/types-7.4.0.tgz",
-          "integrity": "sha512-aPvkXyU2SPOnztlgo8n9cEiXW755mgyvueUPcpStqdzoSPm0fjO0vQBjLkt3JKJW7ufikfcnMTTPsN1xaTsBPA==",
-          "dev": true,
-          "requires": {
-            "esutils": "^2.0.2",
-            "lodash": "^4.17.11",
-            "to-fast-properties": "^2.0.0"
-          }
-        }
       }
     },
     "@babel/helper-explode-assignable-expression": {
@@ -301,19 +157,6 @@
       "dev": true,
       "requires": {
         "@babel/types": "^7.4.0"
-      },
-      "dependencies": {
-        "@babel/types": {
-          "version": "7.4.0",
-          "resolved": "https://registry.npmjs.org/@babel/types/-/types-7.4.0.tgz",
-          "integrity": "sha512-aPvkXyU2SPOnztlgo8n9cEiXW755mgyvueUPcpStqdzoSPm0fjO0vQBjLkt3JKJW7ufikfcnMTTPsN1xaTsBPA==",
-          "dev": true,
-          "requires": {
-            "esutils": "^2.0.2",
-            "lodash": "^4.17.11",
-            "to-fast-properties": "^2.0.0"
-          }
-        }
       }
     },
     "@babel/helper-member-expression-to-functions": {
@@ -395,70 +238,6 @@
         "@babel/helper-optimise-call-expression": "^7.0.0",
         "@babel/traverse": "^7.4.0",
         "@babel/types": "^7.4.0"
-      },
-      "dependencies": {
-        "@babel/generator": {
-          "version": "7.4.0",
-          "resolved": "https://registry.npmjs.org/@babel/generator/-/generator-7.4.0.tgz",
-          "integrity": "sha512-/v5I+a1jhGSKLgZDcmAUZ4K/VePi43eRkUs3yePW1HB1iANOD5tqJXwGSG4BZhSksP8J9ejSlwGeTiiOFZOrXQ==",
-          "dev": true,
-          "requires": {
-            "@babel/types": "^7.4.0",
-            "jsesc": "^2.5.1",
-            "lodash": "^4.17.11",
-            "source-map": "^0.5.0",
-            "trim-right": "^1.0.1"
-          }
-        },
-        "@babel/helper-split-export-declaration": {
-          "version": "7.4.0",
-          "resolved": "https://registry.npmjs.org/@babel/helper-split-export-declaration/-/helper-split-export-declaration-7.4.0.tgz",
-          "integrity": "sha512-7Cuc6JZiYShaZnybDmfwhY4UYHzI6rlqhWjaIqbsJGsIqPimEYy5uh3akSRLMg65LSdSEnJ8a8/bWQN6u2oMGw==",
-          "dev": true,
-          "requires": {
-            "@babel/types": "^7.4.0"
-          }
-        },
-        "@babel/parser": {
-          "version": "7.4.3",
-          "resolved": "https://registry.npmjs.org/@babel/parser/-/parser-7.4.3.tgz",
-          "integrity": "sha512-gxpEUhTS1sGA63EGQGuA+WESPR/6tz6ng7tSHFCmaTJK/cGK8y37cBTspX+U2xCAue2IQVvF6Z0oigmjwD8YGQ==",
-          "dev": true
-        },
-        "@babel/traverse": {
-          "version": "7.4.3",
-          "resolved": "https://registry.npmjs.org/@babel/traverse/-/traverse-7.4.3.tgz",
-          "integrity": "sha512-HmA01qrtaCwwJWpSKpA948cBvU5BrmviAief/b3AVw936DtcdsTexlbyzNuDnthwhOQ37xshn7hvQaEQk7ISYQ==",
-          "dev": true,
-          "requires": {
-            "@babel/code-frame": "^7.0.0",
-            "@babel/generator": "^7.4.0",
-            "@babel/helper-function-name": "^7.1.0",
-            "@babel/helper-split-export-declaration": "^7.4.0",
-            "@babel/parser": "^7.4.3",
-            "@babel/types": "^7.4.0",
-            "debug": "^4.1.0",
-            "globals": "^11.1.0",
-            "lodash": "^4.17.11"
-          }
-        },
-        "@babel/types": {
-          "version": "7.4.0",
-          "resolved": "https://registry.npmjs.org/@babel/types/-/types-7.4.0.tgz",
-          "integrity": "sha512-aPvkXyU2SPOnztlgo8n9cEiXW755mgyvueUPcpStqdzoSPm0fjO0vQBjLkt3JKJW7ufikfcnMTTPsN1xaTsBPA==",
-          "dev": true,
-          "requires": {
-            "esutils": "^2.0.2",
-            "lodash": "^4.17.11",
-            "to-fast-properties": "^2.0.0"
-          }
-        },
-        "source-map": {
-          "version": "0.5.7",
-          "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.5.7.tgz",
-          "integrity": "sha1-igOdLRAh0i0eoUyA2OpGi6LvP8w=",
-          "dev": true
-        }
       }
     },
     "@babel/helper-simple-access": {
@@ -472,12 +251,12 @@
       }
     },
     "@babel/helper-split-export-declaration": {
-      "version": "7.0.0",
-      "resolved": "https://registry.npmjs.org/@babel/helper-split-export-declaration/-/helper-split-export-declaration-7.0.0.tgz",
-      "integrity": "sha512-MXkOJqva62dfC0w85mEf/LucPPS/1+04nmmRMPEBUB++hiiThQ2zPtX/mEWQ3mtzCEjIJvPY8nuwxXtQeQwUag==",
+      "version": "7.4.0",
+      "resolved": "https://registry.npmjs.org/@babel/helper-split-export-declaration/-/helper-split-export-declaration-7.4.0.tgz",
+      "integrity": "sha512-7Cuc6JZiYShaZnybDmfwhY4UYHzI6rlqhWjaIqbsJGsIqPimEYy5uh3akSRLMg65LSdSEnJ8a8/bWQN6u2oMGw==",
       "dev": true,
       "requires": {
-        "@babel/types": "^7.0.0"
+        "@babel/types": "^7.4.0"
       }
     },
     "@babel/helper-wrap-function": {
@@ -501,81 +280,6 @@
         "@babel/template": "^7.4.0",
         "@babel/traverse": "^7.4.3",
         "@babel/types": "^7.4.0"
-      },
-      "dependencies": {
-        "@babel/generator": {
-          "version": "7.4.0",
-          "resolved": "https://registry.npmjs.org/@babel/generator/-/generator-7.4.0.tgz",
-          "integrity": "sha512-/v5I+a1jhGSKLgZDcmAUZ4K/VePi43eRkUs3yePW1HB1iANOD5tqJXwGSG4BZhSksP8J9ejSlwGeTiiOFZOrXQ==",
-          "dev": true,
-          "requires": {
-            "@babel/types": "^7.4.0",
-            "jsesc": "^2.5.1",
-            "lodash": "^4.17.11",
-            "source-map": "^0.5.0",
-            "trim-right": "^1.0.1"
-          }
-        },
-        "@babel/helper-split-export-declaration": {
-          "version": "7.4.0",
-          "resolved": "https://registry.npmjs.org/@babel/helper-split-export-declaration/-/helper-split-export-declaration-7.4.0.tgz",
-          "integrity": "sha512-7Cuc6JZiYShaZnybDmfwhY4UYHzI6rlqhWjaIqbsJGsIqPimEYy5uh3akSRLMg65LSdSEnJ8a8/bWQN6u2oMGw==",
-          "dev": true,
-          "requires": {
-            "@babel/types": "^7.4.0"
-          }
-        },
-        "@babel/parser": {
-          "version": "7.4.3",
-          "resolved": "https://registry.npmjs.org/@babel/parser/-/parser-7.4.3.tgz",
-          "integrity": "sha512-gxpEUhTS1sGA63EGQGuA+WESPR/6tz6ng7tSHFCmaTJK/cGK8y37cBTspX+U2xCAue2IQVvF6Z0oigmjwD8YGQ==",
-          "dev": true
-        },
-        "@babel/template": {
-          "version": "7.4.0",
-          "resolved": "https://registry.npmjs.org/@babel/template/-/template-7.4.0.tgz",
-          "integrity": "sha512-SOWwxxClTTh5NdbbYZ0BmaBVzxzTh2tO/TeLTbF6MO6EzVhHTnff8CdBXx3mEtazFBoysmEM6GU/wF+SuSx4Fw==",
-          "dev": true,
-          "requires": {
-            "@babel/code-frame": "^7.0.0",
-            "@babel/parser": "^7.4.0",
-            "@babel/types": "^7.4.0"
-          }
-        },
-        "@babel/traverse": {
-          "version": "7.4.3",
-          "resolved": "https://registry.npmjs.org/@babel/traverse/-/traverse-7.4.3.tgz",
-          "integrity": "sha512-HmA01qrtaCwwJWpSKpA948cBvU5BrmviAief/b3AVw936DtcdsTexlbyzNuDnthwhOQ37xshn7hvQaEQk7ISYQ==",
-          "dev": true,
-          "requires": {
-            "@babel/code-frame": "^7.0.0",
-            "@babel/generator": "^7.4.0",
-            "@babel/helper-function-name": "^7.1.0",
-            "@babel/helper-split-export-declaration": "^7.4.0",
-            "@babel/parser": "^7.4.3",
-            "@babel/types": "^7.4.0",
-            "debug": "^4.1.0",
-            "globals": "^11.1.0",
-            "lodash": "^4.17.11"
-          }
-        },
-        "@babel/types": {
-          "version": "7.4.0",
-          "resolved": "https://registry.npmjs.org/@babel/types/-/types-7.4.0.tgz",
-          "integrity": "sha512-aPvkXyU2SPOnztlgo8n9cEiXW755mgyvueUPcpStqdzoSPm0fjO0vQBjLkt3JKJW7ufikfcnMTTPsN1xaTsBPA==",
-          "dev": true,
-          "requires": {
-            "esutils": "^2.0.2",
-            "lodash": "^4.17.11",
-            "to-fast-properties": "^2.0.0"
-          }
-        },
-        "source-map": {
-          "version": "0.5.7",
-          "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.5.7.tgz",
-          "integrity": "sha1-igOdLRAh0i0eoUyA2OpGi6LvP8w=",
-          "dev": true
-        }
       }
     },
     "@babel/highlight": {
@@ -603,9 +307,9 @@
       }
     },
     "@babel/parser": {
-      "version": "7.3.2",
-      "resolved": "https://registry.npmjs.org/@babel/parser/-/parser-7.3.2.tgz",
-      "integrity": "sha512-QzNUC2RO1gadg+fs21fi0Uu0OuGNzRKEmgCxoLNzbCdoprLwjfmZwzUrpUNfJPaVRwBpDY47A17yYEGWyRelnQ==",
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+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/tiny-emitter/-/tiny-emitter-2.1.0.tgz",
+      "integrity": "sha512-NB6Dk1A9xgQPMoGqC5CVXn123gWyte215ONT5Pp5a0yt4nlEoO1ZWeCwpncaekPHXO60i47ihFnZPiRPjRMq4Q==",
       "dev": true,
       "optional": true
     },
@@ -21784,9 +21445,9 @@
       "dev": true
     },
     "typical": {
-      "version": "2.6.1",
-      "resolved": "https://registry.npmjs.org/typical/-/typical-2.6.1.tgz",
-      "integrity": "sha1-XAgOXWYcu+OCWdLnCjxyU+hziB0=",
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/typical/-/typical-4.0.0.tgz",
+      "integrity": "sha512-VAH4IvQ7BDFYglMd7BPRDfLgxZZX4O4TFcRDA6EN5X7erNJJq+McIEp8np9aVtxrCJ6qx4GTYVfOWNjcqwZgRw==",
       "dev": true
     },
     "ua-parser-js": {
@@ -21820,9 +21481,9 @@
       "dev": true
     },
     "undertaker": {
-      "version": "1.2.0",
-      "resolved": "https://registry.npmjs.org/undertaker/-/undertaker-1.2.0.tgz",
-      "integrity": "sha1-M52kZGJS0ILcN45wgGcpl1DhG0k=",
+      "version": "1.2.1",
+      "resolved": "https://registry.npmjs.org/undertaker/-/undertaker-1.2.1.tgz",
+      "integrity": "sha512-71WxIzDkgYk9ZS+spIB8iZXchFhAdEo2YU8xYqBYJ39DIUIqziK78ftm26eecoIY49X0J2MLhG4hr18Yp6/CMA==",
       "dev": true,
       "requires": {
         "arr-flatten": "^1.0.1",
@@ -21977,9 +21638,9 @@
       "dev": true
     },
     "upath": {
-      "version": "1.1.0",
-      "resolved": "https://registry.npmjs.org/upath/-/upath-1.1.0.tgz",
-      "integrity": "sha512-bzpH/oBhoS/QI/YtbkqCg6VEiPYjSZtrHQM6/QnJS6OL9pKUFLqb3aFh4Scvwm45+7iAgiMkLhSbaZxUqmrprw==",
+      "version": "1.1.2",
+      "resolved": "https://registry.npmjs.org/upath/-/upath-1.1.2.tgz",
+      "integrity": "sha512-kXpym8nmDmlCBr7nKdIx8P2jNBa+pBpIUFRnKJ4dr8htyYGJFokkr2ZvERRtUN+9SY+JqXouNgUPtv6JQva/2Q==",
       "dev": true
     },
     "update-notifier": {
@@ -22221,9 +21882,9 @@
       },
       "dependencies": {
         "@types/node": {
-          "version": "4.9.1",
-          "resolved": "https://registry.npmjs.org/@types/node/-/node-4.9.1.tgz",
-          "integrity": "sha512-+LRWWDiB4SGY3FG8Cb8R8n9GJQ/rsoZr17zz+v95f7fdiQitk3bvZnjxhcl9T+DBuQ3exfW/3uvEHmLylYDWaw==",
+          "version": "4.9.3",
+          "resolved": "https://registry.npmjs.org/@types/node/-/node-4.9.3.tgz",
+          "integrity": "sha512-Q9eESThBvAbfEzznF1qTAKUoPbJEbK3lTSO0S3mICvmG/vUSZ+HnCtidpuB58Po7CJt5A2goKsDiYScN8d1V4A==",
           "dev": true
         },
         "@types/parse5": {
@@ -22460,6 +22121,14 @@
       "requires": {
         "reduce-flatten": "^1.0.1",
         "typical": "^2.6.1"
+      },
+      "dependencies": {
+        "typical": {
+          "version": "2.6.1",
+          "resolved": "https://registry.npmjs.org/typical/-/typical-2.6.1.tgz",
+          "integrity": "sha1-XAgOXWYcu+OCWdLnCjxyU+hziB0=",
+          "dev": true
+        }
       }
     },
     "wrap-ansi": {
diff --git a/package.json b/package.json
index 912ccace0f..a692489ab4 100644
--- a/package.json
+++ b/package.json
@@ -12,7 +12,7 @@
     "@polymer/gen-typescript-declarations": "^1.5.1",
     "@polymer/iron-component-page": "^3.0.0-pre.12",
     "@polymer/test-fixture": "^3.0.0-pre.12",
-    "@webcomponents/webcomponentsjs": "^2.2.9",
+    "@webcomponents/webcomponentsjs": "^2.2.10",
     "babel-eslint": "^7.2.3",
     "babel-preset-minify": "^0.2.0",
     "del": "^3.0.0",
diff --git a/test/unit/legacy-data.html b/test/unit/legacy-data.html
index 353efd1269..1cd5a06189 100644
--- a/test/unit/legacy-data.html
+++ b/test/unit/legacy-data.html
@@ -51,13 +51,16 @@
           },
           computedMulti: {
             computed: 'computeMulti(computedMultiDep1, computedMultiDep2)'
-          }
+          },
+          wildcardProp: String,
+          wildcardObj: Object
         },
         observers: [
           'staticObserver("staticObserver")',
           'singlePropObserver(singleProp)',
           'multiPropObserver(multiProp1, multiProp2)',
-          'throws(throwProp)'
+          'throws(throwProp)',
+          'wildcardObserver(wildcardProp, wildcardObj.*)'
         ],
         created() {
           this.singlePropObserver = sinon.spy();
@@ -65,6 +68,7 @@
           this.staticObserver = sinon.spy();
           this.computeSingle = sinon.spy((inlineSingleDep) => `[${inlineSingleDep}]`);
           this.computeMulti = sinon.spy((inlineMultiDep1, inlineMultiDep2) => `[${inlineMultiDep1},${inlineMultiDep2}]`);
+          this.wildcardObserver = sinon.spy();
         },
         throws() {
           throw new Error('real error');
@@ -145,6 +149,18 @@
     </template>
   </test-fixture>
 
+  <test-fixture id="declarative-wildcard-one">
+    <template>
+      <x-data wildcard-prop='prop'></x-data>
+    </template>
+  </test-fixture>
+
+  <test-fixture id="declarative-wildcard-all">
+    <template>
+      <x-data wildcard-prop="prop" wildcard-obj='{"prop": "wildcardObj"}'></x-data>
+    </template>
+  </test-fixture>
+
   <script type="module">
     import {flush} from '../../lib/utils/flush.js';
 
@@ -192,6 +208,8 @@
       const inlineMultiDep2 = 'inlineMultiDep2';
       const inlineMultiIfDep1 = 'inlineMultiIfDep1';
       const inlineMultiIfDep2 = 'inlineMultiIfDep2';
+      const wildcardProp = 'wildcardProp';
+      const wildcardObj = {prop: 'wildcardObj'};
 
       suite('check disabled', () => {
         test('no arguments defined', () => {
@@ -270,6 +288,14 @@
           assertEffects({computeMulti: 1});
           assert.equal(el.$$('#ifChild').computedMulti, '[inlineMultiIfDep1,inlineMultiIfDep2]');
         });
+        test('one wildcard argument defined', () => {
+          setupElement(false, {wildcardProp});
+          assertEffects({wildcardObserver: 1});
+        });
+        test('all wildcard arguments defined', () => {
+          setupElement(false, {wildcardProp, wildcardObj});
+          assertEffects({wildcardObserver: 1});
+        });
       });
 
       suite('warn', () => {
@@ -349,6 +375,14 @@
           assertEffects({computeMulti: 1});
           assert.equal(el.$$('#ifChild').computedMulti, '[inlineMultiIfDep1,inlineMultiIfDep2]');
         });
+        test('one wildcard argument defined', () => {
+          setupElement(true, {wildcardProp});
+          assertEffects({warn: 1});
+        });
+        test('all wildcard arguments defined', () => {
+          setupElement(true, {wildcardProp, wildcardObj});
+          assertEffects({wildcardObserver: 1});
+        });
       });
     });
 
@@ -416,6 +450,16 @@
           assertEffects({computeMulti: 1});
           assert.equal(el.$$('#ifChild').computedMulti, '[b,c]');
         });
+        test('one wildcard argument defined', () => {
+          el = fixture('declarative-wildcard-one');
+          flush();
+          assertEffects({warn: 1});
+        });
+        test('all wildcard arguments defined', () => {
+          el = fixture('declarative-wildcard-all');
+          flush();
+          assertEffects({wildcardObserver: 1});
+        });
       });
     });