From cfa0abee0d5e9ebabefb2948707ec2abc7b4fccf Mon Sep 17 00:00:00 2001
From: Pete Gonzalez <4673363+octogonz@users.noreply.github.com>
Date: Thu, 3 Jun 2021 14:11:33 -0700
Subject: [PATCH] Add a workaround for
 https://github.com/microsoft/TypeScript/issues/44422

---
 apps/api-extractor/src/analyzer/Span.ts | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/apps/api-extractor/src/analyzer/Span.ts b/apps/api-extractor/src/analyzer/Span.ts
index c702c312a6f..c834f4bcb90 100644
--- a/apps/api-extractor/src/analyzer/Span.ts
+++ b/apps/api-extractor/src/analyzer/Span.ts
@@ -142,7 +142,16 @@ export class Span {
 
     let previousChildSpan: Span | undefined = undefined;
 
+    const visitedChildren: Set<ts.Node> = new Set();
+
     for (const childNode of this.node.getChildren() || []) {
+      // FIX ME: This is a temporary workaround for a problem introduced by TypeScript 4.3.
+      // https://github.com/microsoft/TypeScript/issues/44422
+      if (visitedChildren.has(childNode)) {
+        continue;
+      }
+      visitedChildren.add(childNode);
+
       const childSpan: Span = new Span(childNode);
       childSpan._parent = this;
       childSpan._previousSibling = previousChildSpan;