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Caveat: You’ll see if(error instanceof Error) example code. The instanceof keyword isn’t great for runtime type checking in all cases, so in the future use Error.isError(error) where applicable. At the time of this writing, the proposal is Stage 3, which means browsers intend to implement, and TypeScript will start to implement as well.
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As you can see, encoding and decoding in TypeScript can make your code safer, reduce the amount of type narrowing you need to do, especially if you use Zod. For consumers of your code and api’s, it gives them the flexibility of utilizing your API’s while providing their own types which includes their own encoders and decoders in a type-safe way. TypeScript can safely ensure all erros are typesafe, and those error scenarios are handled in developers who use your code.
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You can get an unknown return value, so you’ll have to type narrow to your type. (We’ll avoid doing type narrowing in this post and assume you’ll use something like Zod or ArkType heavily in your decoders).
