From b64942854b84ba41c0f75a845d66c88fcaa2cc06 Mon Sep 17 00:00:00 2001
From: Deliaz <D3liaz@gmail.com>
Date: Thu, 6 Sep 2018 19:06:08 +0700
Subject: [PATCH] Throw error if "from" is an empty string #278

---
 src/preProcessPattern.js |  3 +++
 tests/index.js           | 12 +++++++++++-
 2 files changed, 14 insertions(+), 1 deletion(-)

diff --git a/src/preProcessPattern.js b/src/preProcessPattern.js
index ec7e286d..4ff5ca76 100644
--- a/src/preProcessPattern.js
+++ b/src/preProcessPattern.js
@@ -14,6 +14,9 @@ export default function preProcessPattern(globalRef, pattern) {
     pattern = typeof pattern === 'string' ? {
         from: pattern
     } : Object.assign({}, pattern);
+    if (pattern.from === '') {
+        throw new Error('[copy-webpack-plugin] path "from" cannot be empty string');
+    }
     pattern.to = pattern.to || '';
     pattern.context = pattern.context || context;
     if (!path.isAbsolute(pattern.context)) {
diff --git a/tests/index.js b/tests/index.js
index bcb8497e..8c65ace5 100644
--- a/tests/index.js
+++ b/tests/index.js
@@ -227,6 +227,16 @@ describe('apply function', () => {
 
             expect(createPluginWithNull).to.throw(Error);
         });
+
+        it('throws an error if the "from" path is an empty string', () => {
+            const createPluginWithNull = () => {
+                CopyWebpackPlugin({
+                    from: ''
+                });
+            };
+
+            expect(createPluginWithNull).to.throw(Error);
+        });
     });
 
     describe('with glob in from', () => {
@@ -1434,7 +1444,7 @@ describe('apply function', () => {
                         patterns: [{
                             from: '.'
                         }]
-    
+
                     })
                     .then(done)
                     .catch(done);