Added constructor check for buffers

spec/PKPass.ts

@@ -32,6 +32,18 @@ describe("PKPass", () => {
 		);
 	});
 
+	describe("constructor", () => {
+		it("should warn about a non-object buffer parameter", () => {
+			console.warn = jasmine.createSpy("warn");
+
+			pass = new PKPass(undefined, baseCerts);
+
+			expect(console.warn).toHaveBeenCalledWith(
+				Messages.INIT.INVALID_BUFFERS.replace("%s", "undefined"),
+			);
+		});
+	});
+
 	describe("setBeacons", () => {
 		it("should reset instance.props['beacons'] if 'null' is passed as value", () => {
 			pass.setBeacons({

src/PKPass.ts

@@ -130,6 +130,7 @@ export default class PKPass extends Bundle {
 	) {
 		super("application/vnd.apple.pkpass");
 
+		if (buffers && typeof buffers === "object") {
 			const buffersEntries = Object.entries(buffers);
 
 			for (
@@ -140,6 +141,11 @@ export default class PKPass extends Bundle {
 				const [fileName, contentBuffer] = buffer;
 				this.addBuffer(fileName, contentBuffer);
 			}
+		} else {
+			console.warn(
+				Messages.format(Messages.INIT.INVALID_BUFFERS, typeof buffers),
+			);
+		}
 
 		if (props) {
 			/** Overrides validation and pushing in props */

src/messages.ts

@@ -1,3 +1,8 @@
+export const INIT = {
+	INVALID_BUFFERS:
+		"Cannot set buffers in constructor: expected object but received %s",
+} as const;
+
 export const CERTIFICATES = {
 	INVALID:
 		"Invalid certificate(s) loaded. %s. Please provide valid WWDR certificates and developer signer certificate and key (with passphrase).\nRefer to docs to obtain them",