added checks parameter

package.json

@@ -1,6 +1,6 @@
 {
     "name": "imagekit-javascript",
-    "version": "3.0.1",
+    "version": "3.0.2",
     "description": "Javascript SDK for using ImageKit.io in the browser",
     "main": "dist/imagekit.cjs.js",
     "module": "dist/imagekit.esm.js",

src/interfaces/UploadOptions.ts

@@ -141,4 +141,9 @@ export interface UploadOptions {
    * Optional XMLHttpRequest object that you can send for upload API request. You can listen to `progress` and other events on this object for any custom logic. 
    */
   xhr?: XMLHttpRequest
+
+  /**
+   * Optional `checks` parameters can be used to run server-side checks before files are uploaded to the Media Library.
+   */
+  checks?: string
 }

src/upload/index.ts

@@ -90,6 +90,8 @@ export const upload = (
       } else if(key === "transformation" && typeof uploadOptions.transformation === "object" &&
         uploadOptions.transformation !== null) {
         formData.append(key, JSON.stringify(uploadOptions.transformation));
+      } else if (key === 'checks' && uploadOptions.checks) {
+        formData.append("checks", uploadOptions.checks);
       } else if(uploadOptions[key] !== undefined) {
         formData.append(key, String(uploadOptions[key]));
       }

test/upload.js

@@ -1309,4 +1309,34 @@ describe("File upload", function () {
       expect(callback.calledOnce).to.be.true;
       sinon.assert.calledWith(callback, errRes, null);
     });
+
+    it("With checks option", async function () {
+        const fileOptions = {
+          ...securityParameters,
+          fileName: "test_file_name",
+          file: "test_file",
+          responseFields: "tags, customCoordinates, isPrivateFile, metadata",
+          useUniqueFileName: false,
+          checks: "'request.folder' : '/'",
+        };
+        var callback = sinon.spy();
+
+        imagekit.upload(fileOptions, callback);
+
+        expect(server.requests.length).to.be.equal(1);
+        await sleep();
+        successUploadResponse();
+        await sleep();
+
+        var arg = server.requests[0].requestBody;
+        expect(arg.get("file")).to.be.equal("test_file");
+        expect(arg.get("fileName")).to.be.equal("test_file_name");
+        expect(arg.get("responseFields")).to.be.equal("tags, customCoordinates, isPrivateFile, metadata");
+        expect(arg.get("useUniqueFileName")).to.be.equal("false");
+        expect(arg.get("publicKey")).to.be.equal("test_public_key");
+        expect(arg.get('checks')).to.be.equal("'request.folder' : '/'");
+
+        expect(callback.calledOnce).to.be.true;
+        sinon.assert.calledWith(callback, null, uploadSuccessResponseObj);
+    });
 });