No BS TS, 19 Utility Types in Typescript Part 2

Turns out you can define types conditionally based on the a type check against a different type. Let s try it out on a fetch function that optionally takes a callback and can return either a void or a promise based on that callback. 00:00 Introduction 00:17 Utility Types in the handbook 01:30 Function setup 02:58 Parameters and ReturnType 06:39 Class setup 07:30 ConstructorParameters and InstanceType 11:10 Outroduction Utility Types page: Code: If you liked this video, buy me a coffee What s my theme Night Wolf dark blue What s that font MonoLisa Jack is also on the React Round Up podcast. .., JackHerrington, typescript, typescripttutorial, nobsts, nobsts19, nobstsutilitytypes2, utilitytypesintypescript, noBSTS, typescriptutilitytypespage, typescriptutilitytypeomit 20210520 mOA1SA9sfcw