fix: fix urlJoin issue

Author: jooy2

lib/index.ts

@@ -843,11 +843,12 @@ export default class Qsu {
 
 		const argLength = args.length;
 		let urlResult = '';
+		let joinCount = 0;
 
 		for (let i = 0; i < argLength; i += 1) {
 			if (args[i] !== null && args[i] !== undefined) {
 				if (
-					i === 0 ||
+					joinCount === 0 ||
 					args[i].startsWith('/') ||
 					args[i].startsWith('?') ||
 					args[i].startsWith('&')
@@ -856,6 +857,8 @@ export default class Qsu {
 				} else {
 					urlResult += `/${args[i]}`;
 				}
+
+				joinCount += 1;
 			}
 		}
 

test/string.spec.ts

@@ -245,6 +245,7 @@ st`),
 	it('urlJoin', (done) => {
 		assert.strictEqual(urlJoin('https://example.com'), 'https://example.com');
 		assert.strictEqual(urlJoin('https://example.com', null, 'world/'), 'https://example.com/world');
+		assert.strictEqual(urlJoin(null, 'https://example.com', 'world/'), 'https://example.com/world');
 		assert.strictEqual(
 			urlJoin('https://example.com', 'hello', 'world'),
 			'https://example.com/hello/world'