co — Greenflagged

generator async control flow goodness

Supply chain provenance

Status for the latest visible version.

No SLSA provenance npm registry signatures gitHead linked

Without SLSA provenance there is no cryptographic link between this tarball and the public source — the axios compromise (March 2026) relied on exactly this gap.

Maintainers

tjholowaychukjonathanongjongleberry

Keywords

asyncflowgeneratorcorocoroutine

Accepted risks

Findings the reviewer chose to accept rather than block on.

Source	Rule	Reason	Accepted by	When
provenance	publisher-changed	AI (provenance): The tjholowaychuk → jongleberry transition in Jan 2015 is a well-documented, legitimate maintainer handoff for the tj/co project. Not a compromise signal.	ai	2026/04/22
maintainer-change	maintainer-added	AI (maintainer-change): jonathanong and jongleberry were added as part of the documented 2015 maintainer transition from TJ Holowaychuk. Stable, legitimate change.	ai	2026/04/22
source-diff	source-size-dropped	AI (source-diff): Size drop reflects the v3→v4 rewrite of co into a leaner library. No material changes between v4.0.2 and v4.2.0; not a stub/redirect.	ai	2026/04/22
typosquat	typosquat.levenshtein:joi	AI (typosquat): co is a long-established package; Levenshtein distance of 2 on a 2-char name is not meaningful as a typosquat signal.	ai	2026/04/21
typosquat	typosquat.levenshtein:zod	AI (typosquat): co is a long-established package; Levenshtein distance of 2 on a 2-char name is not meaningful as a typosquat signal.	ai	2026/04/21
typosquat	typosquat.levenshtein:pg	AI (typosquat): co is a long-established package; Levenshtein distance of 2 on a 2-char name is not meaningful as a typosquat signal.	ai	2026/04/21
typosquat	typosquat.levenshtein:got	AI (typosquat): co is a long-established package; Levenshtein distance of 2 on a 2-char name is not meaningful as a typosquat signal.	ai	2026/04/21
typosquat	typosquat.levenshtein:koa	AI (typosquat): co is a long-established package (10+ years); short name triggers Levenshtein false positives against many 2-3 char packages. Not a typosquat.	ai	2026/04/21
typosquat	typosquat.levenshtein:cors	AI (typosquat): co is a long-established package; Levenshtein distance of 2 on a 2-char name is not meaningful as a typosquat signal.	ai	2026/04/21
typosquat	typosquat.levenshtein:qs	AI (typosquat): co is a long-established package; Levenshtein distance of 2 on a 2-char name is not meaningful as a typosquat signal.	ai	2026/04/21

Versions (showing 34 of 34)

Version	Deps	Published
4.6.0	0 / 4	2015-07-09
4.5.4	0 / 4	2015-05-03
4.5.2	0 / 3	2015-04-17
4.5.1	0 / 3	2015-03-18
4.5.0	0 / 3	2015-03-18
4.4.0	0 / 3	2015-02-15
4.3.1	0 / 4	2015-02-07
4.3.0	0 / 4	2015-02-07
4.2.0	0 / 4	2015-01-21
4.1.0	0 / 4	2014-12-26
4.0.2	0 / 5	2014-12-18
4.0.1	0 / 5	2014-11-29
4.0.0	0 / 5	2014-11-16
3.1.0	0 / 6	2014-07-27
3.0.6	0 / 6	2014-05-03
3.0.5	0 / 6	2014-03-17
3.0.4	0 / 6	2014-02-18
3.0.2	0 / 6	2014-01-02
3.0.1	0 / 6	2013-12-20
3.0.0	0 / 6	2013-12-20
2.3.0	0 / 6	2013-11-12
2.2.0	0 / 6	2013-11-06
2.1.0	0 / 6	2013-10-21
2.0.0	0 / 6	2013-10-14
1.5.2	0 / 4	2013-09-02
1.5.1	0 / 4	2013-08-11
1.5.0	0 / 4	2013-08-10
1.4.1	0 / 3	2013-07-01
1.4.0	0 / 3	2013-06-22
1.3.0	0 / 3	2013-06-10
1.2.1	0 / 3	2013-06-09
1.2.0	0 / 3	2013-06-08
1.1.0	0 / 3	2013-06-06
1.0.0	0 / 2	2013-06-06

v4.5.4

2 findings

HIGH Publisher changed: jonathanong → jongleberry (on 2015-05-03) provenance

This version was published by a different npm account than previous versions on 2015-05-03. This could indicate a legitimate maintainer transition or an account compromise.