Inspect JS (original) (raw)

inspect-js

This github and npm organization houses JavaScript projects that help you look at stuff.

Predicates

Functions that ask a question and produce a yes or no answer (`true` or `false`).

• defined - - - return the first argument that is !== undefined
• is-accessor-descriptor - - - Returns true if a value has the characteristics of a valid JavaScript accessor descriptor.
• is-arguments - - - Is this an arguments object? It's a harder question than you think.
• is-array-buffer - - - Is this value a JS ArrayBuffer?
• is-arrow-function - - - Determine if a function is an ES6 arrow function or not.
• is-async-function - - - Determine if a function is a native async function.
• is-bigint - - - Is this value an ES BigInt?
• is-boolean-object - - - Is this value a JS Boolean? This module works cross-realm/iframe, and despite ES6 @@toStringTag.
• is-boxed-primitive - - - Is this value a boxed primitive? Shim for node's util.isBoxedPrimitive.
• is-callable - - - Is this JS value callable? Works with Functions and GeneratorFunctions, despite ES6 @@toStringTag.
• is-core-module - - - Is this specifier a node.js core module?
• is-data-descriptor - - - Returns true if a value has the characteristics of a valid JavaScript data descriptor.
• is-data-view - - - Is this value a JS DataView? This module works cross-realm/iframe, does not depend on instanceof or mutable properties, and despite ES6 Symbol.toStringTag.
• is-date-object - - - Is this value a JS Date object? This module works cross-realm/iframe, and despite ES6 @@toStringTag.
• is-descriptor - - - Returns true if a value has the characteristics of a valid JavaScript descriptor. Works for data descriptors and accessor descriptors.
• is-finalizationregistry - - - Is this value a JS FinalizationRegistry? This module works cross-realm/iframe, and despite ES6 @@toStringTag.
• is-generator-function - - - Determine if a function is a native generator function.
• is-map - - - Is this value a JS Map? This module works cross-realm/iframe, and despite ES6 @@toStringTag.
• is-negative-zero - - - Is this value negative zero? === will lie to you
• is-number-object - - - Is this value a JS Number object? This module works cross-realm/iframe, and despite ES6 @@toStringTag.
• is-object - - - Checks whether a value is an object
• is-package-root - - - Is this directory path the root of a package?
• is-regex - - - Is this value a JS regex? Works cross-realm/iframe, and despite ES6 @@toStringTag
• is-registered-symbol - - - Is this value a Symbol stored in the global cross-realm Symbol registry?
• is-set - - - Is this value a JS Set? This module works cross-realm/iframe, and despite ES6 @@toStringTag.
• is-shared-array-buffer - - - Is this value a JS SharedArrayBuffer?
• is-string - - - Is this value a JS String object or primitive? This module works cross-realm/iframe, and despite ES6 @@toStringTag.
• is-symbol - - - Determine if a value is an ES6 Symbol or not.
• is-typed-array - - - 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.
• is-weakmap - - - Is this value a JS WeakMap? This module works cross-realm/iframe, and despite ES6 @@toStringTag.
• is-weakref - - - Is this value a JS WeakRef? This module works cross-realm/iframe, and despite ES6 @@toStringTag.
• is-weakset - - - Is this value a JS WeakSet? This module works cross-realm/iframe, and despite ES6 @@toStringTag.
• is-well-known-symbol - - - Is this value a well-known Symbol?

Comparisons

Packages that compare two things.

Environment

Packages that tell you about the JS env.

Describe

Packages that tell you about a specific JS value.

• array-buffer-byte-length - - - Get the byte length of an ArrayBuffer, even in engines without a .byteLength method.
• data-view-buffer - - - Get the ArrayBuffer out of a DataView, robustly.
• data-view-byte-length - - - Get the byteLength out of a DataView, robustly.
• data-view-byte-offset - - - Get the byteOffset out of a DataView, robustly.
• get-symbol-description - - - Gets the description of a Symbol. Handles Symbol() vs Symbol('') properly when possible.
• object-inspect - - - string representations of objects in node and the browser
• typed-array-buffer - - - Get the ArrayBuffer out of a TypedArray, robustly.
• typed-array-byte-length - - - Robustly get the byte length of a Typed Array
• typed-array-byte-offset - - - Robustly get the byte offset of a Typed Array
• typed-array-length - - - Robustly get the length of a Typed Array
• which-boxed-primitive - - - Which kind of boxed JS primitive is this?
• which-builtin-type - - - What is the type of this builtin JS value?
• which-collection - - - Which kind of Collection (Map, Set, WeakMap, WeakSet) is this JavaScript value? Works cross-realm, without instanceof, and despite Symbol.toStringTag.
• which-typed-array - - - Which kind of Typed Array is this JavaScript value? Works cross-realm, without instanceof, and despite Symbol.toStringTag.

Pinned Loading

1. node's assert.deepEqual algorithm
   JavaScript 791 108
2. string representations of objects in node and the browser
   JavaScript 148 38
3. Is this JS value callable? Works with Functions and GeneratorFunctions, despite ES6 @@toStringTag.
   JavaScript 41 9
4. Are these two values conceptually equal?
   JavaScript 60 7
5. Which kind of Typed Array is this JavaScript value? Works cross-realm, without `instanceof`, and despite Symbol.toStringTag.
   JavaScript 11 4
6. Which kind of boxed JS primitive is this?
   JavaScript 7 2

Repositories

Showing 10 of 78 repositories

• node-exports-info Public
  Info about node `exports` field support: version ranges, categories, etc.
  inspect-js/node-exports-info’s past year of commit activity
  JavaScript
  1
  MIT
  1 1 0
  Updated Mar 26, 2025
• which-typed-array Public
  Which kind of Typed Array is this JavaScript value? Works cross-realm, without `instanceof`, and despite Symbol.toStringTag.
  inspect-js/which-typed-array’s past year of commit activity
  JavaScript
  11
  MIT
  4 1 0
  Updated Mar 9, 2025
• has-strict-mode Public
  Does the current JS environment have strict mode? ES5+ should; but let's not assume.
  inspect-js/has-strict-mode’s past year of commit activity
  JavaScript
  5
  MIT
  1 1 0
  Updated Feb 12, 2025
• available-typed-arrays Public
  Returns an array of Typed Array names that are available in the current environment.
  inspect-js/available-typed-arrays’s past year of commit activity
  JavaScript
  3
  MIT
  3 1 0
  Updated Feb 7, 2025
• is-boolean-object Public
  Is this value a JS Boolean? This module works cross-realm/iframe, and despite ES6 @@toStringTag.
  inspect-js/is-boolean-object’s past year of commit activity
  JavaScript
  7
  MIT
  2 1 0
  Updated Feb 5, 2025
• object-inspect Public
  string representations of objects in node and the browser
  inspect-js/object-inspect’s past year of commit activity
• is-weakref Public
  Is this value a JS WeakRef? This module works cross-realm/iframe, and despite ES6 @@toStringTag.
  inspect-js/is-weakref’s past year of commit activity
  JavaScript
  3
  MIT
  2 1 0
  Updated Feb 3, 2025
• hastypes Public
  Does the given package have TypeScript types?
  inspect-js/hastypes’s past year of commit activity
  JavaScript
  8
  MIT 0
  0 0
  Updated Feb 3, 2025
• inspect-js/is-async-function’s past year of commit activity
  JavaScript
  18
  MIT
  2 1 0
  Updated Jan 23, 2025
• inspect-js/is-well-known-symbol’s past year of commit activity
  JavaScript
  2
  MIT
  1 1 0
  Updated Jan 7, 2025