Remove clearProviders patch

Closes #4.

lib/renderer.js

@@ -72,41 +72,6 @@ class PartialRenderer extends ReactDOMServerRenderer {
 		this.stack[0].footer = '_';
 	}
 
-	/*
-	 * `.destroy()` and `.clearProviders()` methods are added here to fix bug in
-	 * ReactDOM 16.7.0-16.8.2.
-	 * See https://github.com/facebook/react/issues/14705
-	 * This bug will have worse effects with this extension of the class, as
-	 * contexts are added to the context stack without adding to the frame
-	 * stack, so leftover context values crossing over into other threads will
-	 * be much more common.
-	 * `.destroy()` prototype method is removed again at bottom of this script
-	 * if `.clearProviders()` prototype method exists already on
-	 * ReactDOMServerRenderer.
-	 *
-	 * TODO Alter this when updating to ReactDOM > 16.8.2 which includes
-	 * commit fixing this lands in stable release.
-	 * https://github.com/facebook/react/commit/ab7a67b1dc0e44bf74545ccf51a8c143b3af7402
-	 */
-	destroy() {
-		if (!this.exhausted) this.clearProviders();
-		super.destroy();
-	}
-
-	clearProviders() {
-		// Restore any remaining providers on the stack to previous values
-		for (let index = this.contextIndex; index >= 0; index--) {
-			const context = this.contextStack[index];
-			const previousValue = this.contextValueStack[index];
-			context[this.threadID] = previousValue;
-		}
-	}
-
-	resetProviders() {
-		this.clearProviders();
-		this.contextIndex = -1;
-	}
-
 	/*
 	 * Read async
 	 */
@@ -641,6 +606,16 @@ class PartialRenderer extends ReactDOMServerRenderer {
 		}
 	}
 
+	/*
+	 * Reset all Providers in stack.
+	 * ReactDOM's native `.clearProviders()` method resets the content of all
+	 * Providers, but does not reset `.contextIndex`.
+	 */
+	resetProviders() {
+		this.clearProviders();
+		this.contextIndex = -1;
+	}
+
 	/**
 	 * Abort all descendents (children, children's children etc) of a node.
 	 * If promise on lazy component has `.abort()` method, it is called.
@@ -684,15 +659,4 @@ function abort(promise) {
 	if (typeof promise.abort === 'function') promise.abort();
 }
 
-/*
- * If ReactDOM is version which already has `.clearProviders()` method on
- * `PartialRenderer` class, remove `.destroy()` and `.clearProviders()` methods
- * overrides in this subclass.
- * (see comments above on `.destroy()` method)
- */
-if (ReactDOMServerRenderer.prototype.clearProviders) {
-	delete PartialRenderer.prototype.clearProviders;
-	delete PartialRenderer.prototype.destroy;
-}
-
 module.exports = PartialRenderer;