From 1145e1d379cb9ce4892d60b17567edc838ae428d Mon Sep 17 00:00:00 2001
From: Ivan Bunin <chernobelenkiy@gmail.com>
Date: Thu, 24 Jan 2019 11:09:01 +0300
Subject: [PATCH] add unitless if zero

---
 index.js                    | 3 ++-
 spec/px-to-viewport.spec.js | 7 +++++++
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/index.js b/index.js
index 7bcc46a..e6d4fdf 100755
--- a/index.js
+++ b/index.js
@@ -60,7 +60,8 @@ function createPxReplace(viewportSize, minPixelValue, unitPrecision, viewportUni
     if (!$1) return m;
     var pixels = parseFloat($1);
     if (pixels <= minPixelValue) return m;
-    return toFixed((pixels / viewportSize * 100), unitPrecision) + viewportUnit;
+    var parsedVal = toFixed((pixels / viewportSize * 100), unitPrecision);
+    return parsedVal === 0 ? '0' : parsedVal + viewportUnit;
   };
 }
 
diff --git a/spec/px-to-viewport.spec.js b/spec/px-to-viewport.spec.js
index 23632e2..9d0e6cb 100644
--- a/spec/px-to-viewport.spec.js
+++ b/spec/px-to-viewport.spec.js
@@ -36,6 +36,13 @@ describe('px-to-viewport', function() {
 
     expect(processed).toBe(expected);
   });
+
+  it('should remain unitless if 0', function () {
+    var expected = '.rule { font-size: 0px; font-size: 0; }';
+    var processed = postcss(pxToViewport()).process(expected).css;
+
+    expect(processed).toBe(expected);
+  });
 });
 
 describe('value parsing', function() {