From e53ca567619c2f1b982f0ccb33eb302230ff1be5 Mon Sep 17 00:00:00 2001
From: seongwon-kang <abc7988se@gmail.com>
Date: Fri, 27 Nov 2020 07:01:09 +0000
Subject: [PATCH 1/2] fix: check undefined string and show how to correct

---
 src/createTag/createTag.js      |  6 ++++++
 src/createTag/createTag.test.js | 13 +++++++++++++
 2 files changed, 19 insertions(+)

diff --git a/src/createTag/createTag.js b/src/createTag/createTag.js
index 01cc5d6..45dad8d 100644
--- a/src/createTag/createTag.js
+++ b/src/createTag/createTag.js
@@ -93,6 +93,12 @@ export default function createTag(...rawTransformers) {
     if (!Array.isArray(strings)) {
       return tag([strings]);
     }
+    
+    if (typeof strings[0] === 'undefined') {
+      throw TypeError(`input string is undefined: Check your template string. 
+        (e.g. \\4 will throw SyntaxError with 'Octal escape sequences are not allowed')
+      `);
+    }
 
     const tagCallInfo = getTagCallInfo(transformers);
 
diff --git a/src/createTag/createTag.test.js b/src/createTag/createTag.test.js
index 390140d..c2eba60 100644
--- a/src/createTag/createTag.test.js
+++ b/src/createTag/createTag.test.js
@@ -298,3 +298,16 @@ test('accepts other tags as arguments and applies them in order', () => {
 
   expect(superTag`foo`).toBe('foo1234');
 });
+
+test('invalid template string should throw error message', () => {
+  const getInitialContext = jest.fn();
+  const tag = createTag({ getInitialContext });
+
+  let actual = ()=> {
+    tag`\4`;
+  };
+
+  expect(actual).toThrow(
+    `input string is undefined: Check your template string.`,
+  );
+});
\ No newline at end of file

From 60de0ac321e9e1db8a9689645b14f9e20c0707c1 Mon Sep 17 00:00:00 2001
From: seongwon-kang <abc7988se@gmail.com>
Date: Fri, 27 Nov 2020 07:05:12 +0000
Subject: [PATCH 2/2] Linting

---
 src/createTag/createTag.js      | 2 +-
 src/createTag/createTag.test.js | 4 ++--
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/src/createTag/createTag.js b/src/createTag/createTag.js
index 45dad8d..7f04b03 100644
--- a/src/createTag/createTag.js
+++ b/src/createTag/createTag.js
@@ -93,7 +93,7 @@ export default function createTag(...rawTransformers) {
     if (!Array.isArray(strings)) {
       return tag([strings]);
     }
-    
+
     if (typeof strings[0] === 'undefined') {
       throw TypeError(`input string is undefined: Check your template string. 
         (e.g. \\4 will throw SyntaxError with 'Octal escape sequences are not allowed')
diff --git a/src/createTag/createTag.test.js b/src/createTag/createTag.test.js
index c2eba60..c812319 100644
--- a/src/createTag/createTag.test.js
+++ b/src/createTag/createTag.test.js
@@ -303,11 +303,11 @@ test('invalid template string should throw error message', () => {
   const getInitialContext = jest.fn();
   const tag = createTag({ getInitialContext });
 
-  let actual = ()=> {
+  let actual = () => {
     tag`\4`;
   };
 
   expect(actual).toThrow(
     `input string is undefined: Check your template string.`,
   );
-});
\ No newline at end of file
+});