skip transformation if its null or undefined

Author: ANKUR DWIVEDI

src/url/builder.ts

@@ -82,6 +82,8 @@ function constructTransformationString(transformation: Transformation[] | undefi
   for (var i = 0, l = transformation.length; i < l; i++) {
     var parsedTransformStep = [];
     for (var key in transformation[i]) {
+      if(transformation[i][key] === undefined || transformation[i][key] === null )
+      continue;
       var transformKey = transformationUtils.getTransformKey(key);
       if (!transformKey) {
         transformKey = key;

test/url-generation.js

@@ -279,6 +279,19 @@ describe("URL generation", function () {
         expect(url).equal(`https://ik.imagekit.io/test_url_endpoint/tr:di-test_path.jpg/test_path1.jpg`);
     });
 
+    it('skip transformation if it is undefined or null', function () {
+        const url = imagekit.url({
+            path: "/test_path1.jpg",
+            transformation: [{
+                defaultImage: "/test_path.jpg",
+                quality: undefined,
+                effectContrast: null
+            }]
+        })
+
+        expect(url).equal(`https://ik.imagekit.io/test_url_endpoint/tr:di-test_path.jpg/test_path1.jpg`);
+    });
+
     it('All combined', function () {
         const url = imagekit.url({
             path: "/test_path.jpg",