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978 packages found

Returns true if a value has the characteristics of a valid JavaScript descriptor. Works for data descriptors and accessor descriptors.

published 3.1.1 6 months ago
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Returns true if a value has the characteristics of a valid JavaScript accessor descriptor.

published 3.0.5 6 months ago
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Returns true if a value has the characteristics of a valid JavaScript data descriptor.

published 2.1.3 6 months ago
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Check if something is a Node.js stream

published 4.0.1 2 months ago
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Detect the file type of a Buffer/Uint8Array/ArrayBuffer

published 19.0.0 4 months ago
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Returns true if an object was created by the `Object` constructor, or Object.create(null).

published 5.0.0 4 years ago
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unist utility to check if a node passes a test

published 6.0.0 10 months ago
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Get the native type of a value.

published 6.0.3 4 years ago
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Check if a value is a plain object

published 4.1.0 2 years ago
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Check if a path is a file, directory, or symlink

published 5.0.0 3 years ago
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Type checking utils.

published 1.1.0 5 months ago
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A simple TypeScript library providing type guards for the primitive types in JavaScript.

published 2.1.4 23 days ago
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type-check allows you to check the types of JavaScript values at runtime with a Haskell like type syntax.

published 0.4.0 4 years ago
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Returns true if a number or string value is a finite number. Useful for regex matches, parsing, user input, etc.

published 7.0.0 6 years ago
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A little library for asserting types and values, with zero dependencies.

published 11.2.3 8 months ago
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Runtime library to validate data against TypeScript interfaces

published 1.0.2 3 years ago
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Returns true if the value is an object and not an array or null.

published 4.0.0 5 years ago
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Function argument validation for humans

published 1.1.1 a year ago
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Standard assertion utilities.

published 0.2.1 3 months ago
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