Generate unique ids within each React island (#6976)

1 files changed, 24 insertions, 0 deletions

diff --git a/packages/integrations/react/context.js b/packages/integrations/react/context.js
new file mode 100644
index 000000000..5d9b1d7b1
--- /dev/null
+++ b/packages/integrations/react/context.js
@@ -0,0 +1,24 @@
+const contexts = new WeakMap();
+
+const ID_PREFIX = 'r';
+
+function getContext(rendererContextResult) {
+	if (contexts.has(rendererContextResult)) {
+		return contexts.get(rendererContextResult);
+	}
+	const ctx = {
+		currentIndex: 0,
+		get id() {
+			return ID_PREFIX + this.currentIndex.toString();
+		},
+	};
+	contexts.set(rendererContextResult, ctx);
+	return ctx;
+}
+
+export function incrementId(rendererContextResult) {
+	const ctx = getContext(rendererContextResult)
+	const id = ctx.id;
+	ctx.currentIndex++;
+	return id;
+}