fix(query-template-by-id.ts): add cache param, remove unnecessary req…

…uestUpdate

packages/lit-override/src/decorators/query-template-by-id.ts

@@ -12,6 +12,7 @@ export interface ExtendedElement extends ReactiveElement {
 }
 
 export interface QueryTemplateByIdParams {
+  cache?: boolean;
   fallback?: boolean;
 }
 
@@ -21,9 +22,10 @@ export interface QueryTemplateByIdParams {
  * Gets a template element by id that is provided to the `templateId` property.
  * Will cache the template element on successful query.
  *
+ * @param cache caches the template element between component renders when enabled. Defaults to `true`.
  * @param fallback gets a template element if an id is not provided (not cached). Defaults to `false`.
  */
-export const queryTemplateById = ({ fallback = false }: QueryTemplateByIdParams = {}) => {
+export const queryTemplateById = ({ cache = true, fallback = false }: QueryTemplateByIdParams = {}) => {
   return <T extends ReactiveElement>(proto: T, propName: string) => {
     // this is a 'wrapper' around a custom property accessor: https://lit.dev/docs/components/properties/#accessors
     const internalKey = Symbol(`_${String(propName)}`);
@@ -38,7 +40,7 @@ export const queryTemplateById = ({ fallback = false }: QueryTemplateByIdParams
           this._templateCache = {};
         }
 
-        if (id && this._templateCache[id]) {
+        if (id && this._templateCache[id] && cache) {
           return this._templateCache[id];
         }
 
@@ -49,7 +51,9 @@ export const queryTemplateById = ({ fallback = false }: QueryTemplateByIdParams
             return null;
           }
 
-          this._templateCache[id] = templateElement;
+          if (cache) {
+            this._templateCache[id] = templateElement;
+          }
           return templateElement;
         }
 
@@ -59,11 +63,9 @@ export const queryTemplateById = ({ fallback = false }: QueryTemplateByIdParams
         const oldValue = this[internalKey];
         this[internalKey] = value;
 
-        if (this._templateCache && oldValue) {
+        if (this._templateCache && oldValue && cache) {
           delete this._templateCache[oldValue];
         }
-
-        this.requestUpdate('templateId', oldValue);
       },
       enumerable: true,
       configurable: true,