fix: items check error when attribute value is undefined or null (#39)

src/provider/EventChecker.ts

@@ -221,7 +221,7 @@ export class EventChecker {
 		let errorMsg;
 		let error: EventError;
 		for (const [key, value] of Object.entries(item)) {
-			const valueStr = value.toString();
+			const valueStr = String(value);
 			if (!EventChecker.itemKeySet.has(key)) {
 				customKeyNumber += 1;
 				if (customKeyNumber > MAX_NUM_OF_CUSTOM_ITEM_ATTRIBUTE) {

test/provider/AnalyticsEventBuilder.test.ts

@@ -120,6 +120,17 @@ describe('AnalyticsEventBuilder test', () => {
 		);
 	});
 
+	test('test check event attribute with invalid value', () => {
+		let clickstreamAttribute: ClickstreamAttribute = {};
+		clickstreamAttribute['testUndefinedKey'] = undefined;
+		clickstreamAttribute['testNullKey'] = null;
+		clickstreamAttribute =
+			AnalyticsEventBuilder.getEventAttributesWithCheck(clickstreamAttribute);
+		expect(
+			Event.ReservedAttribute.ERROR_CODE in clickstreamAttribute
+		).toBeFalsy();
+	});
+
 	test('test check event attribute reached max attribute value length', () => {
 		let clickstreamAttribute: ClickstreamAttribute = {};
 		let longValue = '';
@@ -280,6 +291,25 @@ describe('AnalyticsEventBuilder test', () => {
 		);
 	});
 
+	test('test check item value for undefined or null', () => {
+		const clickstreamAttribute: ClickstreamAttribute = {};
+		const items: Item[] = [];
+		const item: Item = {
+			id: 'item_1',
+			undefinedKey: undefined,
+			nullKey: null,
+		};
+		items.push(item);
+		const resultItems = AnalyticsEventBuilder.getEventItemsWithCheck(
+			items,
+			clickstreamAttribute
+		);
+		expect(resultItems.length).toBe(1);
+		expect(
+			Event.ReservedAttribute.ERROR_CODE in clickstreamAttribute
+		).toBeFalsy();
+	});
+
 	test('test check event attributes will not affect global attributes', () => {
 		const customAttributes: ClickstreamAttribute = {
 			testKey: 'testValue',