Inspect JS

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78 repositories

is-registered-symbol
Public
Is this value a Symbol stored in the global cross-realm Symbol registry?
javascript registry ecmascript symbol registered keyfor
JavaScript
•
MIT License
•1•4•1•0•Updated Dec 31, 2025Dec 31, 2025
object-inspect
Public
string representations of objects in node and the browser
javascript node browser object inspect
JavaScript
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MIT License
•40•158•4•3•Updated Dec 30, 2025Dec 30, 2025
node-deep-equal
Public
node's assert.deepEqual algorithm
nodejs javascript node assert strict equal deepequal loose
JavaScript
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MIT License
•108•792•4•0•Updated Dec 30, 2025Dec 30, 2025
is-typed-array
Public
Is this value a JS Typed Array? This module works cross-realm/iframe, does not depend on `instanceof` or mutable properties, and despite ES6 Symbol.toStringTag.
javascript ecmascript typedarray typedarrays
JavaScript
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MIT License
•7•12•1•0•Updated Dec 30, 2025Dec 30, 2025
is-symbol
Public
Is this an ES6 Symbol value?
javascript is symbol es6-symbol boxed
JavaScript
•
MIT License
•5•19•1•0•Updated Dec 30, 2025Dec 30, 2025
is-string
Public
Is this value a JS String object or primitive? This module works cross-realm/iframe, and despite ES6 @@toStringTag.
javascript string object
JavaScript
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MIT License
•3•22•2•0•Updated Dec 30, 2025Dec 30, 2025
is-regex
Public
Is this value a JS regex?
javascript is regex regexp js-regex
JavaScript
•
MIT License
•11•24•1•0•Updated Dec 30, 2025Dec 30, 2025
is-object
Public
Checks whether a value is an object, because typeof is a troll
javascript is object null
JavaScript
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MIT License
•7•21•1•0•Updated Dec 30, 2025Dec 30, 2025
is-number-object
Public
Is this value a JS Number object? This module works cross-realm/iframe, and despite ES6 @@toStringTag.
is number boxed js-number
JavaScript
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MIT License
•3•8•1•0•Updated Dec 30, 2025Dec 30, 2025
is-negative-zero
Public
Is this value negative zero? === will lie to you.
javascript is zero negative
JavaScript
•
MIT License
•3•18•1•0•Updated Dec 30, 2025Dec 30, 2025
is-map
Public
Is this value a JS Map? This module works cross-realm/iframe, and despite %Symbol.toStringTag%.
javascript map set collection is ecmascript
JavaScript
•
MIT License
•5•9•1•0•Updated Dec 30, 2025Dec 30, 2025
is-generator-function
Public
Is this an ES6 generator function?
javascript generator is function
JavaScript
•
MIT License
•11•49•2•0•Updated Dec 30, 2025Dec 30, 2025
is-equal
Public
Are these two values conceptually equal?
javascript is equal
JavaScript
•
MIT License
•7•60•2•0•Updated Dec 30, 2025Dec 30, 2025
is-descriptor
Public
Returns true if a value has the characteristics of a valid JavaScript descriptor. Works for data descriptors and accessor descriptors.
nodejs javascript node descriptor accessor accessor-descriptor data-descriptor
JavaScript
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MIT License
•4•12•0•0•Updated Dec 30, 2025Dec 30, 2025
is-date-object
Public
Is this value a JS Date object? This module works cross-realm/iframe, and despite ES6 @@toStringTag.
javascript date is
JavaScript
•
MIT License
•5•16•1•0•Updated Dec 30, 2025Dec 30, 2025
is-data-descriptor
Public
Returns true if a value has the characteristics of a valid JavaScript data descriptor.
JavaScript
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MIT License
•6•21•0•0•Updated Dec 30, 2025Dec 30, 2025
is-core-module
Public
Is this specifier a node.js core module?
node module core is
JavaScript
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MIT License
•11•26•1•1•Updated Dec 30, 2025Dec 30, 2025
is-callable
Public
Is this JS value callable? Works with Functions and GeneratorFunctions, despite ES6 @@toStringTag.
javascript functions ecmascript function callable is-callable
JavaScript
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MIT License
•9•42•3•0•Updated Dec 30, 2025Dec 30, 2025
is-boxed-primitive
Public
Polyfill/shim for node's `util.types.isBoxedPrimitive()`
javascript is primitive boxed
JavaScript
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MIT License
•1•7•1•0•Updated Dec 30, 2025Dec 30, 2025
is-boolean-object
Public
Is this value a JS Boolean? This module works cross-realm/iframe, and despite ES6 @@toStringTag.
javascript is boolean false true boxed
JavaScript
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MIT License
•2•7•1•0•Updated Dec 30, 2025Dec 30, 2025
is-bigint
Public
Is this an ES BigInt value?
javascript brand is ecmascript bigint
JavaScript
•
MIT License
•2•7•1•0•Updated Dec 30, 2025Dec 30, 2025
is-async-function
Public
Is this a native `async function`?
async function await async-await fn is-async-function
JavaScript
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MIT License
•2•18•1•0•Updated Dec 30, 2025Dec 30, 2025
is-array-buffer
Public
Is this value a JS ArrayBuffer? This module works cross-realm/iframe, does not depend on `instanceof` or mutable properties, and despite ES6 Symbol.toStringTag.
javascript is buffer array ecmascript arraybuffer
JavaScript
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MIT License
•5•13•0•0•Updated Dec 30, 2025Dec 30, 2025
is-arguments
Public
Is this an arguments object? It's a harder question than you think.
javascript is object arguments
JavaScript
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MIT License
•7•17•1•0•Updated Dec 30, 2025Dec 30, 2025
is-accessor-descriptor
Public
Returns true if a value has the characteristics of a valid JavaScript accessor descriptor.
nodejs javascript node descriptor accessor accessor-descriptor
JavaScript
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MIT License
•4•15•0•0•Updated Dec 30, 2025Dec 30, 2025
has-typed-arrays
Public
Determine if the JS environment has Typed Arrays.
JavaScript
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MIT License
•1•2•1•0•Updated Dec 30, 2025Dec 30, 2025
has-template-literals
Public
Determine if the JS environment has template literal support
javascript template interpolation ecmascript literals quasiliterals interpoliterals
JavaScript
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MIT License
•1•7•1•0•Updated Dec 30, 2025Dec 30, 2025
has-symbols
Public
Determine if the JS environment has Symbol support. Supports spec, or shams.
javascript es6 es2015 ecmascript symbols symbol has core-js symbol-support
JavaScript
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MIT License
•6•18•1•1•Updated Dec 30, 2025Dec 30, 2025
has-strict-mode
Public
Does the current JS environment have strict mode? ES5+ should; but let's not assume.
javascript ecmascript strict
JavaScript
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MIT License
•1•5•1•0•Updated Dec 30, 2025Dec 30, 2025
has-bigints
Public
Determine if the JS environment has BigInt support.
JavaScript
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MIT License
•5•8•1•0•Updated Dec 30, 2025Dec 30, 2025