Repositories list

• has-tostringtag

  Public
  Determine if the JS environment has `Symbol.toStringTag` support. Supports spec, or shams.

  javascriptecmascriptsymbols+ 2

  javascriptecmascriptsymbolssymboltostringtag

  JavaScript

  •

  MIT License

  •3•5•1•0•Updated Mar 20, 2026Mar 20, 2026

• is-arguments

  Public
  Is this an arguments object? It's a harder question than you think.

  javascriptisobject+ 1

  javascriptisobjectarguments

  JavaScript

  •

  MIT License

  •7•17•1•0•Updated Mar 20, 2026Mar 20, 2026

• is-regex

  Public
  Is this value a JS regex?

  javascriptisregex+ 2

  javascriptisregexregexpjs-regex

  JavaScript

  •

  MIT License

  •11•24•1•0•Updated Mar 20, 2026Mar 20, 2026

• has-bigints

  Public
  Determine if the JS environment has BigInt support.

  JavaScript

  •

  MIT License

  •5•8•1•0•Updated Mar 19, 2026Mar 19, 2026

• buffer-equal

  Public
  JavaScript

  •

  MIT License

  •1•3•0•0•Updated Mar 19, 2026Mar 19, 2026

• which-collection

  Public
  Which kind of Collection (Map, Set, WeakMap, WeakSet) is this JavaScript value? Works cross-realm, without `instanceof`, and despite Symbol.toStringTag.

  javascriptmapset+ 4

  javascriptmapsetcollectionweakmapwhichweakset

  JavaScript

  •

  MIT License

  •3•9•1•0•Updated Mar 19, 2026Mar 19, 2026

• typed-array-length

  Public
  Robustly get the length of a Typed Array.

  JavaScript

  •

  MIT License

  •2•8•1•0•Updated Mar 19, 2026Mar 19, 2026

• which-boxed-primitive

  Public
  Which kind of boxed JS primitive is this?

  JavaScript

  •

  MIT License

  •2•7•1•0•Updated Mar 19, 2026Mar 19, 2026

• which-typed-array

  Public
  Which kind of Typed Array is this JavaScript value? Works cross-realm, without `instanceof`, and despite Symbol.toStringTag.

  JavaScript

  •

  MIT License

  •4•11•1•0•Updated Mar 19, 2026Mar 19, 2026

• object-is

  Public
  ES6-compliant shim for Object.is - differentiates between -0 and +0, and can compare to NaN.

  JavaScript

  •

  MIT License

  •7•0•0•0•Updated Mar 18, 2026Mar 18, 2026

• has-named-captures

  Public
  Does the JS environment support named capture groups in regexes?

  javascriptregexregular-expression+ 4

  javascriptregexregular-expressioncapturegroupregular-expressionsnamed

  JavaScript

  •

  MIT License

  •0•2•1•0•Updated Mar 16, 2026Mar 16, 2026

• has-private-fields

  Public
  Determine if the JS environment has private fields (`class { #x; }`) support.

  javascriptecmascriptclass+ 3

  javascriptecmascriptclassprivatefieldsprivate-field

  JavaScript

  •

  MIT License

  •1•5•1•0•Updated Mar 16, 2026Mar 16, 2026

• is-accessor-descriptor

  Public
  Returns true if a value has the characteristics of a valid JavaScript accessor descriptor.

  nodejsjavascriptnode+ 3

  nodejsjavascriptnodedescriptoraccessoraccessor-descriptor

  JavaScript

  •

  MIT License

  •4•15•0•0•Updated Mar 16, 2026Mar 16, 2026

• is-core-module

  Public
  Is this specifier a node.js core module?

  nodemodulecore+ 1

  nodemodulecoreis

  JavaScript

  •

  MIT License

  •11•26•1•1•Updated Mar 16, 2026Mar 16, 2026

• which-builtin-type

  Public
  What is the type of this builtin JS value?

  JavaScript

  •

  MIT License

  •1•3•1•0•Updated Mar 16, 2026Mar 16, 2026

• node-deep-equal

  Public
  node's assert.deepEqual algorithm

  nodejsjavascriptnode+ 5

  nodejsjavascriptnodeassertstrictequaldeepequalloose

  JavaScript

  •

  MIT License

  •105•794•4•0•Updated Mar 16, 2026Mar 16, 2026

• is-symbol

  Public
  Is this an ES6 Symbol value?

  javascriptissymbol+ 2

  javascriptissymboles6-symbolboxed

  JavaScript

  •

  MIT License

  •5•19•1•0•Updated Mar 16, 2026Mar 16, 2026

• object-inspect

  Public
  string representations of objects in node and the browser

  javascriptnodebrowser+ 2

  javascriptnodebrowserobjectinspect

  JavaScript

  •

  MIT License

  •43•160•5•5•Updated Mar 14, 2026Mar 14, 2026

• available-regexp-flags

  Public
  Which regular expression flags does the current environment support?

  unicoderegexregexp+ 8

  unicoderegexregexpstickyglobalmultilineignorecaseflagsdotallhasindices+ 1

  JavaScript

  •

  MIT License

  •1•6•1•0•Updated Mar 10, 2026Mar 10, 2026

• available-typed-arrays

  Public
  Returns an array of Typed Array names that are available in the current environment.

  JavaScript

  •

  MIT License

  •3•3•1•0•Updated Mar 10, 2026Mar 10, 2026

• .github

  Public template
  .github repo for inspect-js org

  JavaScript

  •

  MIT License

  •2•1•0•0•Updated Feb 25, 2026Feb 25, 2026

• node-exports-info

  Public
  Info about node `exports` field support: version ranges, categories, etc.

  JavaScript

  •

  MIT License

  •1•1•1•0•Updated Jan 28, 2026Jan 28, 2026

• is-weakref

  Public
  Is this value a JS WeakRef? This module works cross-realm/iframe, and despite ES6 @@toStringTag.

  JavaScript

  •

  MIT License

  •2•3•1•0•Updated Jan 20, 2026Jan 20, 2026

• typed-array-buffer

  Public
  Get the ArrayBuffer out of a TypedArray, robustly.

  JavaScript

  •

  MIT License

  •0•5•1•0•Updated Jan 16, 2026Jan 16, 2026

• array-buffer-byte-length

  Public
  Get the byte length of an ArrayBuffer, even in engines without a `.byteLength` method.

  polyfillbytearraybuffer+ 5

  polyfillbytearraybuffershimbytelengthlengthes-shimses-shim

  JavaScript

  •

  MIT License

  •0•2•1•0•Updated Jan 13, 2026Jan 13, 2026

• hastypes

  Public
  Does the given package have TypeScript types?

  nodejsjavascriptshell+ 2

  nodejsjavascriptshellclitypescript

  JavaScript

  •

  MIT License

  •0•8•0•0•Updated Jan 13, 2026Jan 13, 2026

• is-well-known-symbol

  Public
  Is this value a well-known Symbol?

  javascriptecmascriptsymbol+ 1

  javascriptecmascriptsymbolwell-known

  JavaScript

  •

  MIT License

  •1•2•1•0•Updated Jan 13, 2026Jan 13, 2026

• is-weakset

  Public
  Is this value a JS WeakSet? This module works cross-realm/iframe, and despite ES6 @@toStringTag.

  javascriptmapset+ 5

  javascriptmapsetcollectionecmascriptweakmapweaksetjs-weakset

  JavaScript

  •

  MIT License

  •1•3•1•0•Updated Jan 13, 2026Jan 13, 2026

• is-weakmap

  Public
  Is this value a JS WeakMap? This module works cross-realm/iframe, and despite ES6 @@toStringTag.

  javascriptmapset+ 4

  javascriptmapsetisecmascriptweakmapweakset

  JavaScript

  •

  MIT License

  •1•3•1•0•Updated Jan 13, 2026Jan 13, 2026

• is-shared-array-buffer

  Public
  Is this value a JS SharedArrayBuffer? This module works cross-realm/iframe, does not depend on `instanceof` or mutable properties, and despite ES6 Symbol.toStri…

  javascriptisbuffer+ 4

  javascriptisbufferarrayecmascriptsharedsharedarraybuffer

  JavaScript

  •

  MIT License

  •2•3•1•0•Updated Jan 13, 2026Jan 13, 2026