Assertion-Functions on Dev & Platform Engineering Hubhttps://rhidayat.work/topics/assertion-functions/Recent content in Assertion-Functions on Dev & Platform Engineering HubHugo -- gohugo.ioen© 2026 Rachmat HidayatSun, 09 Aug 2026 10:45:00 +0000TS Ep 10: Custom Type Guards & Assertion Functionshttps://rhidayat.work/series/typescript/fundamental/10-custom-type-guards-is/Sun, 09 Aug 2026 10:45:00 +0000https://rhidayat.work/series/typescript/fundamental/10-custom-type-guards-is/Learn how to build custom runtime type validators in TypeScript. Master Type Predicates (<code>parameter is Type</code>), Assertion Functions (<code>asserts val is Type</code>), array <code>.filter()</code> type narrowing, and safely parsing untrusted external JSON data.