Web Reference: For class types you can use JavaScript's instanceof to determine the class an instance comes from, and TypeScript will narrow the type in the type-checker automatically. Types are stripped away at compile-time and do not exist at runtime, so you can't check the type at runtime. Typescript is the best thing to happen to Javascript since the Great Callback Pyramid crumbled. We got types, autocomplete, compile-time issue catching, and the world was finally at peace, until someone decided to use instanceof(yes it was me). You see, even though we got all of the aforementioned goodies, there are still a few quirks of the typesc... Feb 1, 2022 · Explore five methods of performing TypeScript type checks at runtime in this post and learn each of their advantages and disadvantages.
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