703 packages found
Description
Returns true if an object was created by the `Object` constructor, or Object.create(null).
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Detect the file type of a Buffer/Uint8Array/ArrayBuffer
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Check if a value is a plain object
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A little library for asserting types and values.
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- type
- types
- type-check
- type-checking
- duck-typing
- arguments
- parameters
- values
- data
- contract
- assert
- check
- verify
- safe
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Check if a path is a file, directory, or symlink
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Check if a value is an object
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Type check values
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unist utility to check if a node passes a test
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Get the native type of a value.
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Check if something is a Node.js stream
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type-check allows you to check the types of JavaScript values at runtime with a Haskell like type syntax.
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A type checking library where each exported function returns either true or false and does not throw. Also added tests.
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Function argument validation for humans
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- type
- types
- check
- checking
- guard
- guards
- assert
- assertion
- predicate
- predicates
- is
- validate
- validation
- utility
- View more
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Check if a value is a regular expression
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Check if something is a promise
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Returns true if a number or string value is a finite number. Useful for regex matches, parsing, user input, etc.
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Returns true if the value is an object and not an array or null.
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Check if a string or buffer is SVG
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Returns true if a value exists, false if empty. Works with deeply nested values using object paths.
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Checks TypeScript types match expected values