Update polyfills to work with the updated version of TypeScript.

Author: bicknellr

packages/custom-elements/ts_src/custom-elements.ts

@@ -43,7 +43,7 @@ function installPolyfill() {
   const customElements = new CustomElementRegistry(internals);
 
   // The main document is associated with the global registry.
-  document.__CE_registry = (customElements as unknown) as CustomElementRegistry;
+  (document.__CE_registry as unknown) = customElements;
 
   Object.defineProperty(window, 'customElements', {
     configurable: true,

packages/formdata-event/ts_src/environment/event.ts

@@ -9,7 +9,7 @@
  * additional IP rights grant found at http://polymer.github.io/PATENTS.txt
  */
 
-export const constructor = window.Event;
+export const constructor: typeof Event = window.Event;
 
 export const prototype = constructor.prototype;
 

packages/formdata-event/ts_src/wrappers/event.ts

@@ -37,11 +37,11 @@ export const getEventPropagationImmediatelyStopped = (e: Event) => {
 // const s = new SpecialEvent("type");
 // console.assert(s instanceof SpecialEvent); // fails in Safari 13.1
 // ```
-export const Event: typeof window.Event = (function Event(
+export const Event: typeof EventConstructor = (function Event(
   this: Event,
   type: string,
   eventInit: EventInit = {}
-) {
+): Event {
   let _this;
   // When running in a browser where Event isn't constructible (e.g. IE11) this
   // throws and we fall back to the old `createEvent` API.
@@ -53,7 +53,7 @@ export const Event: typeof window.Event = (function Event(
   }
   Object.setPrototypeOf(_this, Object.getPrototypeOf(this));
   return _this;
-} as Function) as typeof window.Event;
+} as unknown) as typeof EventConstructor;
 
 prepareWrapper(Event, EventConstructor, EventPrototype);
 

packages/webcomponentsjs/ts_src/platform/custom-event.ts

@@ -60,7 +60,7 @@ if (!window.Event || (isIE && typeof window.Event !== 'function')) {
 
 // CustomEvent constructor shim
 if (!window.CustomEvent || (isIE && typeof window.CustomEvent !== 'function')) {
-  window['CustomEvent'] = ((<T extends unknown>(
+  window['CustomEvent'] = ((<T>(
     inType: string,
     params?: CustomEventInit<T>
   ) => {

packages/webcomponentsjs/ts_src/platform/es6-misc.ts

@@ -12,7 +12,7 @@
 export {};
 
 if (!Array.from) {
-  Array.from = <T extends unknown>(object: ArrayLike<T>): Array<T> => {
+  Array.from = <T>(object: ArrayLike<T>): Array<T> => {
     return [].slice.call(object);
   };
 }