is

the definitive JavaScript type testing library

v3.3.0 URL: https://unpkg.com/is@3.3.0/index.js

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is-stream

Check if something is a Node.js stream

v4.0.1 URL: https://unpkg.com/is-stream@4.0.1/index.js

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stream type streams writable readable duplex transform check detect is

type-is

Infer the content-type of a request.

v1.6.18 URL: https://unpkg.com/type-is@1.6.18/index.js

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content type checking

path-type

Check if a path is a file, directory, or symlink

v6.0.0 URL: https://unpkg.com/path-type@6.0.0/index.js

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path fs type is check directory file filepath symlink symbolic link stat stats filesystem

@sindresorhus/is

Type check values

v7.0.1 URL: https://unpkg.com/@sindresorhus/is@7.0.1/index.js

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type types is check checking validate validation utility util typeof instanceof object assert assertion test kind primitive verify compare typescript typeguards types