From 4bcab0b82c2a384d2c45f46e804a46912eb17ad5 Mon Sep 17 00:00:00 2001
From: Toru Nagashima <star.ctor@gmail.com>
Date: Sat, 16 Jun 2018 11:38:45 +0900
Subject: [PATCH] Chore: follow up #2

---
 README.md      | 2 +-
 src/index.ts   | 2 +-
 test/parser.ts | 7 +++++++
 3 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/README.md b/README.md
index fc78ed2..b6eeefc 100644
--- a/README.md
+++ b/README.md
@@ -35,7 +35,7 @@ Parse a given regular expression literal then make AST object.
 This is equivalent to `new RegExpParser(options).parseLiteral(source)`.
 
 - **Parameters:**
-    - `source` (`string`) The source code to parse.
+    - `source` (`string | RegExp`) The source code to parse.
     - `options?` ([`RegExpParser.Options`]) The options to parse.
 - **Return:**
     - The AST of the regular expression.
diff --git a/src/index.ts b/src/index.ts
index a96784f..0b6bac5 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -15,7 +15,7 @@ export function parseRegExpLiteral(
     source: string | RegExp,
     options?: RegExpParser.Options,
 ): AST.RegExpLiteral {
-    return new RegExpParser(options).parseLiteral(source instanceof RegExp ? String(source) : source)
+    return new RegExpParser(options).parseLiteral(String(source))
 }
 
 /**
diff --git a/test/parser.ts b/test/parser.ts
index 2bffecf..3e6e1a0 100644
--- a/test/parser.ts
+++ b/test/parser.ts
@@ -50,6 +50,13 @@ describe("parseRegExpLiteral function:", () => {
             }
         })
     }
+
+    it("should parse RegExp object", () => {
+        const actual = cloneWithoutCircular(parseRegExpLiteral(/[A-Z]+/))
+        const expected = cloneWithoutCircular(parseRegExpLiteral("/[A-Z]+/"))
+
+        assert.deepStrictEqual(actual, expected)
+    })
 })
 
 for (const filename of Object.keys(Fixtures)) {