From 187094b9a6f56d5ccb117c4701f8446a92c9f893 Mon Sep 17 00:00:00 2001
From: Yen-Wei Liu <liu.yenwei@gmail.com>
Date: Wed, 5 May 2021 14:08:43 -0700
Subject: [PATCH] [babel-types] Update `matchesPattern` to account for `this`
 (#13264)

---
 packages/babel-types/src/validators/matchesPattern.ts | 9 ++++++++-
 packages/babel-types/test/misc.js                     | 8 ++++++++
 2 files changed, 16 insertions(+), 1 deletion(-)

diff --git a/packages/babel-types/src/validators/matchesPattern.ts b/packages/babel-types/src/validators/matchesPattern.ts
index 6088f2e48c..c8acedb8dd 100644
--- a/packages/babel-types/src/validators/matchesPattern.ts
+++ b/packages/babel-types/src/validators/matchesPattern.ts
@@ -1,4 +1,9 @@
-import { isIdentifier, isMemberExpression, isStringLiteral } from "./generated";
+import {
+  isIdentifier,
+  isMemberExpression,
+  isStringLiteral,
+  isThisExpression,
+} from "./generated";
 import type * as t from "..";
 
 /**
@@ -35,6 +40,8 @@ export default function matchesPattern(
       value = node.name;
     } else if (isStringLiteral(node)) {
       value = node.value;
+    } else if (isThisExpression(node)) {
+      value = "this";
     } else {
       return false;
     }
diff --git a/packages/babel-types/test/misc.js b/packages/babel-types/test/misc.js
index 79b1155a0f..6fb9568be2 100644
--- a/packages/babel-types/test/misc.js
+++ b/packages/babel-types/test/misc.js
@@ -40,5 +40,13 @@ describe("misc helpers", function () {
       expect(t.matchesPattern(ast, "b.c.d", true)).toBe(false);
       expect(t.matchesPattern(ast, "a.b.c.d.e", true)).toBe(false);
     });
+
+    it("matches this expressions", function () {
+      const ast = parseCode("this.a.b.c.d").expression;
+      expect(t.matchesPattern(ast, "this.a.b.c.d")).toBeTruthy();
+      expect(t.matchesPattern(ast, "this.a.b.c")).toBe(false);
+      expect(t.matchesPattern(ast, "this.b.c.d")).toBe(false);
+      expect(t.matchesPattern(ast, "this.a.b.c.d.e")).toBe(false);
+    });
   });
 });