Web Reference: Jul 10, 2025 · The TypeError object represents an error when an operation could not be performed, typically (but not exclusively) when a value is not of the expected type. In JS it doesn't seem possible to check if an argument passed to a function is actually of the type 'error' or an instance of Error. For example, this is not valid: typeof err === 'error' since ... A short guide on best practices, techniques and existing tooling available to prevent TypeErrors in JavaScript or TypeScript.
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