624 packages found

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A little library for asserting types and values.

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published 11.1.28 months ago
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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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published 0.4.06 months ago
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Returns true if an object was created by the `Object` constructor, or Object.create(null).

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published 5.0.016 days ago
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Get the native type of a value.

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published 6.0.38 months ago
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Detect the file type of a Buffer/Uint8Array/ArrayBuffer

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published 15.0.111 days ago
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unist utility to check if a node passes a test

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published 4.0.27 months ago
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Check if a value is a plain object

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published 2.1.08 months ago
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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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published 2.0.6a month ago
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Check if something is a Node.js stream

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published 2.0.0a year ago
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Check if a string or buffer is SVG

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published 4.2.18 months ago
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Function argument validation for humans

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published 0.17.07 months ago
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Returns true if the value is an object and not an array or null.

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published 4.0.0a year ago
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Check if a path is a file, directory, or symlink

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published 4.0.02 years ago
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Check if a value is an object

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published 2.0.0a year 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.

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published 7.0.02 years ago
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Binary wrapper for Flow - A static type checker for JavaScript

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published 0.134.08 days ago
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Check if a value is an Observable

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published 2.1.02 months ago
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Infer the content-type of a request.

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published 1.6.18a year ago
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Description

Returns true if a value exists, false if empty. Works with deeply nested values using object paths.

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published 2.0.23 years ago