Work around TS compiler bug in context (#3691)

lit · Feb 22, 2023 · 4fa0311 · 4fa0311
1 parent 515d5ee
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diff --git a/.changeset/dry-students-shop.md b/.changeset/dry-students-shop.md
@@ -0,0 +1,5 @@
+---
+'@lit-labs/context': patch
+---
+
+Work around a common bug in compilers that target ES5 when extending built in classes like Event.
diff --git a/packages/labs/context/src/lib/controllers/context-provider.ts b/packages/labs/context/src/lib/controllers/context-provider.ts
@@ -28,6 +28,9 @@ export class ContextProviderEvent<
    */
   public constructor(public readonly context: C) {
     super('context-provider', {bubbles: true, composed: true});
+    // Work around TypeScript compiler bug
+    // https://github.com/Microsoft/TypeScript/wiki/Breaking-Changes#extending-built-ins-like-error-array-and-map-may-no-longer-work
+    Object.setPrototypeOf(this, new.target.prototype);
   }
 }