Stefan Baumgartner • 3/2/2021

TypeScript: Narrow types in catch clauses

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This article explains TypeScript's restriction that catch clause variables can only be typed as 'any' or 'unknown'. It details three reasons: any value can be thrown in JavaScript, there's only one catch clause per try statement, and the broad range of possible exceptions. It then shows the correct way to narrow error types using instanceof, typeof, and custom type guards.

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#TypeScript #error handling #catch clause
TypeScript: Narrow types in catch clauses

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