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payload-is

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A comprehensive TypeScript/JavaScript type checking library providing functions to check data types, collections, primitives, and built-in objects

github.com/YJJA/payload-is.git

YJJA/payload-is

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export declare function isUndefined(payload: unknown): payload is undefined; export declare function isNull(payload: unknown): payload is null; export declare function isNil(payload: unknown): payload is null | undefined;