Get Started

Package · npm

which-collection

npm · v1.0.2 · MIT

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

Not filed under any category yet: no assignment reached confidence 0.5.

Install

npm install which-collection

Adoption

Downloads (30 days)
315M
Observeddownloads / 30 days
Popularity
Top 10% on npm
Derived97th percentile within npm
Dependents
649
Observedpackages that depend on it
Maintenance
0.05
DerivedRelease cadence and recency, 0 to 1
Releases per year
0.7
3 versions over its life

Growth by period

Derived by Crest of Tech from two observations of npm’s own figure, a period apart. Nothing is stored or estimated: without an observation near the period’s start, the period is still collecting.

7 days
Collectinghistory
Collecting
30 days
−2.8% · 30d
Derived−9.2M downloads / 30 days, SEP 24 → OCT 24
90 days
+10.2% · 90d
Derived+29.2M downloads / 30 days, JUL 26 → OCT 24
1 year
+102.7% · 1y
Derived+159.6M downloads / 30 days, NOV 3 → OCT 24

Adoption historydownloads / 30 days · 111 observations

NOV 3, 2025: 155,369,778 downloads / 30 daysNOV 10, 2025: 157,986,502 downloads / 30 daysNOV 17, 2025: 159,459,085 downloads / 30 daysNOV 24, 2025: 158,439,161 downloads / 30 daysDEC 1, 2025: 158,046,225 downloads / 30 daysDEC 8, 2025: 161,599,922 downloads / 30 daysDEC 15, 2025: 164,024,292 downloads / 30 daysDEC 22, 2025: 162,056,835 downloads / 30 daysDEC 29, 2025: 147,399,173 downloads / 30 daysJAN 5, 2026: 131,082,571 downloads / 30 daysJAN 12, 2026: 128,591,257 downloads / 30 daysJAN 19, 2026: 140,459,760 downloads / 30 daysJAN 26, 2026: 159,402,713 downloads / 30 daysFEB 2, 2026: 181,468,696 downloads / 30 daysFEB 9, 2026: 190,075,494 downloads / 30 daysFEB 16, 2026: 188,594,819 downloads / 30 daysFEB 23, 2026: 192,681,781 downloads / 30 daysMAR 2, 2026: 201,564,787 downloads / 30 daysMAR 9, 2026: 209,778,513 downloads / 30 daysMAR 16, 2026: 219,072,851 downloads / 30 daysMAR 23, 2026: 227,141,911 downloads / 30 daysMAR 30, 2026: 231,738,067 downloads / 30 daysAPR 6, 2026: 230,050,038 downloads / 30 daysAPR 13, 2026: 230,989,072 downloads / 30 daysAPR 20, 2026: 233,504,695 downloads / 30 daysAPR 27, 2026: 235,822,602 downloads / 30 daysMAY 4, 2026: 238,525,371 downloads / 30 daysMAY 11, 2026: 245,926,076 downloads / 30 daysMAY 18, 2026: 252,240,749 downloads / 30 daysMAY 25, 2026: 256,387,470 downloads / 30 daysJUN 1, 2026: 261,829,092 downloads / 30 daysJUN 8, 2026: 243,894,980 downloads / 30 daysJUN 15, 2026: 236,454,714 downloads / 30 daysJUN 22, 2026: 240,443,733 downloads / 30 daysJUN 29, 2026: 244,596,412 downloads / 30 daysJUL 6, 2026: 266,855,585 downloads / 30 daysJUL 13, 2026: 278,306,377 downloads / 30 daysJUL 20, 2026: 283,934,189 downloads / 30 daysJUL 26, 2026: 285,852,182 downloads / 30 daysJUL 27, 2026: 293,894,472 downloads / 30 daysJUL 28, 2026: 302,464,811 downloads / 30 daysJUL 29, 2026: 304,544,099 downloads / 30 daysJUL 30, 2026: 306,173,771 downloads / 30 daysJUL 31, 2026: 306,466,527 downloads / 30 daysAUG 1, 2026: 301,450,201 downloads / 30 daysAUG 2, 2026: 298,659,012 downloads / 30 daysAUG 3, 2026: 306,993,438 downloads / 30 daysAUG 4, 2026: 316,047,411 downloads / 30 daysAUG 5, 2026: 318,567,121 downloads / 30 daysAUG 6, 2026: 317,937,407 downloads / 30 daysAUG 7, 2026: 318,217,923 downloads / 30 daysAUG 8, 2026: 312,731,012 downloads / 30 daysAUG 9, 2026: 308,097,626 downloads / 30 daysAUG 10, 2026: 315,719,245 downloads / 30 daysAUG 11, 2026: 329,355,464 downloads / 30 daysAUG 12, 2026: 330,447,491 downloads / 30 daysAUG 13, 2026: 331,317,649 downloads / 30 daysAUG 14, 2026: 319,117,382 downloads / 30 daysAUG 15, 2026: 313,416,428 downloads / 30 daysAUG 16, 2026: 308,825,140 downloads / 30 daysAUG 17, 2026: 315,352,475 downloads / 30 daysAUG 18, 2026: 323,566,624 downloads / 30 daysAUG 19, 2026: 325,131,842 downloads / 30 daysAUG 20, 2026: 325,471,437 downloads / 30 daysAUG 21, 2026: 324,441,677 downloads / 30 daysAUG 22, 2026: 318,009,527 downloads / 30 daysAUG 23, 2026: 312,933,075 downloads / 30 daysAUG 24, 2026: 320,519,891 downloads / 30 daysAUG 25, 2026: 328,714,404 downloads / 30 daysAUG 26, 2026: 329,583,407 downloads / 30 daysAUG 27, 2026: 330,215,069 downloads / 30 daysAUG 28, 2026: 329,556,601 downloads / 30 daysAUG 29, 2026: 323,015,689 downloads / 30 daysAUG 30, 2026: 318,179,162 downloads / 30 daysAUG 31, 2026: 325,197,278 downloads / 30 daysSEP 1, 2026: 334,031,515 downloads / 30 daysSEP 2, 2026: 336,726,473 downloads / 30 daysSEP 3, 2026: 322,933,016 downloads / 30 daysSEP 4, 2026: 322,641,531 downloads / 30 daysSEP 5, 2026: 318,480,592 downloads / 30 daysSEP 6, 2026: 313,353,682 downloads / 30 daysSEP 7, 2026: 306,987,774 downloads / 30 daysSEP 8, 2026: 300,465,530 downloads / 30 daysSEP 9, 2026: 302,879,781 downloads / 30 daysSEP 10, 2026: 304,637,968 downloads / 30 daysSEP 11, 2026: 304,802,362 downloads / 30 daysSEP 12, 2026: 298,286,676 downloads / 30 daysSEP 13, 2026: 305,688,324 downloads / 30 daysSEP 14, 2026: 314,363,090 downloads / 30 daysSEP 15, 2026: 307,730,293 downloads / 30 daysSEP 16, 2026: 310,556,937 downloads / 30 daysSEP 17, 2026: 311,562,018 downloads / 30 daysSEP 18, 2026: 311,622,448 downloads / 30 daysSEP 19, 2026: 306,477,364 downloads / 30 daysSEP 20, 2026: 302,714,379 downloads / 30 daysSEP 21, 2026: 311,037,873 downloads / 30 daysSEP 22, 2026: 319,870,748 downloads / 30 daysSEP 23, 2026: 322,321,429 downloads / 30 daysSEP 24, 2026: 324,221,656 downloads / 30 daysSEP 25, 2026: 324,893,017 downloads / 30 daysSEP 26, 2026: 318,793,513 downloads / 30 daysSEP 27, 2026: 314,457,239 downloads / 30 daysSEP 28, 2026: 324,838,871 downloads / 30 daysSEP 29, 2026: 335,428,299 downloads / 30 daysSEP 30, 2026: 339,382,700 downloads / 30 daysOCT 1, 2026: 342,231,670 downloads / 30 daysOCT 2, 2026: 341,851,062 downloads / 30 daysOCT 3, 2026: 350,737,223 downloads / 30 daysOCT 4, 2026: 346,300,352 downloads / 30 daysOCT 5, 2026: 346,300,352 downloads / 30 daysOCT 24, 2026: 315,007,082 downloads / 30 days
Table of observations (116)
Daydownloads / 30 daysDependents
OCT 24, 2026315,007,082649
OCT 5, 2026346,300,352Not observed
OCT 4, 2026346,300,352Not observed
OCT 3, 2026350,737,223Not observed
OCT 2, 2026341,851,062Not observed
OCT 1, 2026342,231,670Not observed
SEP 30, 2026339,382,700Not observed
SEP 29, 2026335,428,299Not observed
SEP 28, 2026324,838,871Not observed
SEP 27, 2026314,457,239Not observed
SEP 26, 2026318,793,513Not observed
SEP 25, 2026324,893,017Not observed
SEP 24, 2026324,221,656Not observed
SEP 23, 2026322,321,429Not observed
SEP 22, 2026319,870,748Not observed
SEP 21, 2026311,037,873Not observed
SEP 20, 2026302,714,379Not observed
SEP 19, 2026306,477,364Not observed
SEP 18, 2026311,622,448Not observed
SEP 17, 2026311,562,018Not observed
SEP 16, 2026310,556,937Not observed
SEP 15, 2026307,730,293Not observed
SEP 14, 2026314,363,090Not observed
SEP 13, 2026305,688,324Not observed
SEP 12, 2026298,286,676Not observed
SEP 11, 2026304,802,362Not observed
SEP 10, 2026304,637,968Not observed
SEP 9, 2026302,879,781Not observed
SEP 8, 2026300,465,530Not observed
SEP 7, 2026306,987,774Not observed
SEP 6, 2026313,353,682Not observed
SEP 5, 2026318,480,592Not observed
SEP 4, 2026322,641,531Not observed
SEP 3, 2026322,933,016Not observed
SEP 2, 2026336,726,473Not observed
SEP 1, 2026334,031,515Not observed
AUG 31, 2026325,197,278Not observed
AUG 30, 2026318,179,162Not observed
AUG 29, 2026323,015,689Not observed
AUG 28, 2026329,556,601Not observed
AUG 27, 2026330,215,069Not observed
AUG 26, 2026329,583,407Not observed
AUG 25, 2026328,714,404Not observed
AUG 24, 2026320,519,891Not observed
AUG 23, 2026312,933,075Not observed
AUG 22, 2026318,009,527Not observed
AUG 21, 2026324,441,677Not observed
AUG 20, 2026325,471,437Not observed
AUG 19, 2026325,131,842Not observed
AUG 18, 2026323,566,624Not observed
AUG 17, 2026315,352,475Not observed
AUG 16, 2026308,825,140Not observed
AUG 15, 2026313,416,428Not observed
AUG 14, 2026319,117,382Not observed
AUG 13, 2026331,317,649Not observed
AUG 12, 2026330,447,491Not observed
AUG 11, 2026329,355,464Not observed
AUG 10, 2026315,719,245Not observed
AUG 9, 2026308,097,626Not observed
AUG 8, 2026312,731,012Not observed
AUG 7, 2026318,217,923Not observed
AUG 6, 2026317,937,407Not observed
AUG 5, 2026318,567,121Not observed
AUG 4, 2026316,047,411Not observed
AUG 3, 2026306,993,438Not observed
AUG 2, 2026298,659,012Not observed
AUG 1, 2026301,450,201Not observed
JUL 31, 2026306,466,527Not observed
JUL 30, 2026306,173,771Not observed
JUL 29, 2026304,544,099Not observed
JUL 28, 2026302,464,811Not observed
JUL 27, 2026293,894,472Not observed
JUL 26, 2026285,852,182Not observed
JUL 20, 2026283,934,189Not observed
JUL 13, 2026278,306,377Not observed
JUL 6, 2026266,855,585Not observed
JUN 29, 2026244,596,412Not observed
JUN 22, 2026240,443,733Not observed
JUN 15, 2026236,454,714Not observed
JUN 8, 2026243,894,980Not observed
JUN 1, 2026261,829,092Not observed
MAY 25, 2026256,387,470Not observed
MAY 18, 2026252,240,749Not observed
MAY 11, 2026245,926,076Not observed
MAY 4, 2026238,525,371Not observed
APR 27, 2026235,822,602Not observed
APR 20, 2026233,504,695Not observed
APR 13, 2026230,989,072Not observed
APR 6, 2026230,050,038Not observed
MAR 30, 2026231,738,067Not observed
MAR 23, 2026227,141,911Not observed
MAR 16, 2026219,072,851Not observed
MAR 9, 2026209,778,513Not observed
MAR 2, 2026201,564,787Not observed
FEB 23, 2026192,681,781Not observed
FEB 16, 2026188,594,819Not observed
FEB 9, 2026190,075,494Not observed
FEB 2, 2026181,468,696Not observed
JAN 26, 2026159,402,713Not observed
JAN 19, 2026140,459,760Not observed
JAN 12, 2026128,591,257Not observed
JAN 5, 2026131,082,571Not observed
DEC 29, 2025147,399,173Not observed
DEC 22, 2025162,056,835Not observed
DEC 15, 2025164,024,292Not observed
DEC 8, 2025161,599,922Not observed
DEC 1, 2025158,046,225Not observed
NOV 24, 2025158,439,161Not observed
NOV 17, 2025159,459,085Not observed
NOV 10, 2025157,986,502Not observed
NOV 3, 2025155,369,778Not observed
OCT 27, 2025Not observedNot observed
OCT 20, 2025Not observedNot observed
OCT 13, 2025Not observedNot observed
OCT 6, 2025Not observedNot observed
OCT 5, 2025Not observedNot observed

Facts from the registry

Latest version
v1.0.2
3 versions
First published
NOV 13, 2019
Last release
MAR 8, 2024
3y ago
Licence
MIT
Links
npm page
Homepage · github.com
Source · github.com

Repository

Not in the Crest catalog

inspect-js/which-collection

The catalog tracks GitHub repositories with more than 500 stars; this one has no Crest page, so its figures are not shown here.

Dependencies latest version · v1.0.2

Runtime 4

  • is-map^2.0.3
  • is-set^2.0.3
  • is-weakmap^2.0.2
  • is-weakset^2.0.3

Related packages

No related package is in the catalog yet.

Related news

No published news event mentions this package or its repository yet.