chore: remove dependency on ie11 types (#5941)

* feat: new execution context design (#5800)

* refactor: new design for execution context

* feat: add two new event helpers to the execution context and tests

* fix: wip update types to match new context apis

* fix: update foundation and components template types

* Change files

* fix: update template type in fast-website

* fix: update site components for new template types

* fix: add missing api updates

Co-authored-by: EisenbergEffect <[email protected]>

* remove unnecessary dependency on @types/ie11 package

* Change files

Co-authored-by: Rob Eisenberg <[email protected]>
Co-authored-by: EisenbergEffect <[email protected]>

change/@microsoft-fast-element-5a826d6a-4945-4423-873e-27ef3dba737b.json

@@ -0,0 +1,7 @@
+{
+  "type": "none",
+  "comment": "remove unnecessary dependency on @types/ie11 package",
+  "packageName": "@microsoft/fast-element",
+  "email": "[email protected]",
+  "dependentChangeType": "none"
+}

packages/web-components/fast-element/package.json

@@ -73,7 +73,6 @@
     "@types/karma": "^5.0.0",
     "@types/mocha": "^7.0.2",
     "@types/webpack-env": "^1.15.2",
-    "@types/web-ie11": "^0.0.0",
     "chai": "^4.2.0",
     "chai-spies": "^1.0.0",
     "esm": "^3.2.25",

packages/web-components/fast-element/src/interfaces.ts

@@ -21,6 +21,16 @@ export type Mutable<T> = {
     -readonly [P in keyof T]: T[P];
 };
 
+/**
+ * Extracts the item type from an array.
+ * @public
+ */
+export type ArrayItem<T> = T extends ReadonlyArray<infer TItem>
+    ? TItem
+    : T extends Array<infer TItem>
+    ? TItem
+    : any;
+
 /**
  * A policy for use with the standard trustedTypes platform API.
  * @public

packages/web-components/fast-element/tsconfig.json

@@ -11,8 +11,7 @@
         "module": "ESNext",
         "types": [
             "mocha",
-            "webpack-env",
-            "web-ie11"
+            "webpack-env"
         ],
         "lib": [
             "DOM",