Lint and type fixes

externs/closure-types.js

@@ -78,6 +78,15 @@ Polymer_PropertiesChanged.prototype._enableProperties = function(){};
 Polymer_PropertiesChanged.prototype._flushProperties = function(){};
 /**
 * @param {!Object} currentProps Bag of all current accessor values
+* @param {!Object} changedProps Bag of properties changed since the last
+  call to `_propertiesChanged`
+* @param {!Object} oldProps Bag of previous values for each property
+  in `changedProps`
+* @return {boolean}
+*/
+Polymer_PropertiesChanged.prototype._shouldPropertiesChange = function(currentProps, changedProps, oldProps){};
+/**
+* @param {!Object} currentProps Bag of all current accessor values
 * @param {!Object} changedProps Bag of properties changed since the last
   call to `_propertiesChanged`
 * @param {!Object} oldProps Bag of previous values for each property

lib/mixins/properties-changed.html

@@ -353,7 +353,7 @@ subject to an additional IP rights grant found at http://polymer.github.io/PATEN
          *   in `changedProps`
          * @return {boolean} true if changedProps is truthy
          */
-        _shouldPropertiesChange(props, changedProps, old) {
+        _shouldPropertiesChange(currentProps, changedProps, oldProps) { // eslint-disable-line no-unused-vars
           return changedProps;
         }
 

test/unit/properties-changed.html

@@ -160,8 +160,7 @@ suite('properties-changed', function() {
         done();
       });
     });
-  })
-
+  });
 });
 
 </script>

types/lib/mixins/properties-changed.d.ts

@@ -182,6 +182,21 @@ declare namespace Polymer {
      */
     _flushProperties(): void;
 
+    /**
+     * Called in `_flushProperties` to determine if `_propertiesChanged`
+     * should be called. The default implementation returns true if
+     * properties are pending. Override to customize when
+     * `_propertiesChanged` is called.
+     *
+     * @param currentProps Bag of all current accessor values
+     * @param changedProps Bag of properties changed since the last
+     *   call to `_propertiesChanged`
+     * @param oldProps Bag of previous values for each property
+     *   in `changedProps`
+     * @returns true if changedProps is truthy
+     */
+    _shouldPropertiesChange(currentProps: object, changedProps: object, oldProps: object): boolean;
+
     /**
      * Callback called when any properties with accessors created via
      * `_createPropertyAccessor` have been set.