fix: don't error on navigating to a download link (#328)

src/tab.ts

@@ -66,7 +66,26 @@ export class Tab {
   }
 
   async navigate(url: string) {
-    await this.page.goto(url, { waitUntil: 'domcontentloaded' });
+    const downloadEvent = this.page.waitForEvent('download').catch(() => {});
+    try {
+      await this.page.goto(url, { waitUntil: 'domcontentloaded' });
+    } catch (_e: unknown) {
+      const e = _e as Error;
+      const mightBeDownload =
+        e.message.includes('net::ERR_ABORTED') // chromium
+        || e.message.includes('Download is starting'); // firefox + webkit
+      if (!mightBeDownload)
+        throw e;
+
+      // on chromium, the download event is fired *after* page.goto rejects, so we wait a lil bit
+      const download = await Promise.race([
+        downloadEvent,
+        new Promise(resolve => setTimeout(resolve, 500)),
+      ]);
+      if (!download)
+        throw e;
+    }
+
     // Cap load event to 5 seconds, the page is operational at this point.
     await this.page.waitForLoadState('load', { timeout: 5000 }).catch(() => {});
   }