Use case-map lib in a saner way.

In this file currently you can refer to the function as: caseMap.dashToCamelCase, CaseMap.dashToCamelCase, or dashToCamelCase. Let's just do a standard import style here.

lib/mixins/property-effects.js

@@ -13,16 +13,12 @@ import '../utils/boot.js';
 import { dedupingMixin } from '../utils/mixin.js';
 import { root as root$0, isAncestor, isDescendant, get as get$0, translate, isPath as isPath$0, set as set$0, normalize } from '../utils/path.js';
 /* for notify, reflect */
-import * as caseMap from '../utils/case-map.js';
-import { camelToDashCase as camelToDashCase$0, dashToCamelCase } from '../utils/case-map.js';
+import { camelToDashCase, dashToCamelCase } from '../utils/case-map.js';
 import { PropertyAccessors } from './property-accessors.js';
 /* for annotated effects */
 import { TemplateStamp } from './template-stamp.js';
 import { sanitizeDOMValue } from '../utils/settings.js';
 
-/** @const {Object} */
-const CaseMap = caseMap;
-
 // Monotonically increasing unique ID used for de-duping effects triggered
 // from multiple properties in the same turn
 let dedupeId = 0;
@@ -272,7 +268,7 @@ function runNotifyEffects(inst, notifyProps, props, oldProps, hasPaths) {
 function notifyPath(inst, path, props) {
   let rootProperty = root$0(path);
   if (rootProperty !== path) {
-    let eventName = camelToDashCase$0(rootProperty) + '-changed';
+    let eventName = camelToDashCase(rootProperty) + '-changed';
     dispatchNotifyEvent(inst, eventName, props[path], path);
     return true;
   }
@@ -492,7 +488,7 @@ function addBinding(constructor, templateInfo, nodeInfo, kind, target, parts, li
   // Add listener info to binding metadata
   if (shouldAddListener(binding)) {
     let {event, negate} = binding.parts[0];
-    binding.listenerEvent = event || (CaseMap.camelToDashCase(target) + '-changed');
+    binding.listenerEvent = event || (camelToDashCase(target) + '-changed');
     binding.listenerNegate = negate;
   }
   // Add "propagate" property effects to templateInfo
@@ -2127,7 +2123,7 @@ export const PropertyEffects = dedupingMixin(superClass => {
       this._addPropertyEffect(property, TYPES.NOTIFY, {
         fn: runNotifyEffect,
         info: {
-          eventName: CaseMap.camelToDashCase(property) + '-changed',
+          eventName: camelToDashCase(property) + '-changed',
           property: property
         }
       });