event-source-polyfill MIT 40 versions

event-source-polyfill

npm Repository Homepage

A polyfill for http://www.w3.org/TR/eventsource/

40

Versions

MIT

License

No

Install Scripts

Missing

Provenance

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

lakenenyaffle

Keywords

sseserver sent eventseventsourceevent-sourcepolyfill

Accepted risks

Findings the reviewer chose to accept rather than block on.

Source	Rule	Reason	Accepted by	When
provenance	publisher-changed	AI (provenance): Publisher changed to yaffle (the actual author per GitHub/package.json) in 2015; clearly a legitimate transition for this package.	ai	2026/04/24
maintainer-change	maintainer-added	AI (maintainer-change): yaffle is the original author of the EventSource polyfill; maintainer addition is legitimate and stable.	ai	2026/04/24
provenance	no-provenance	AI (provenance): Older package without provenance attestation; no security concern given established trust.	ai	2026/04/24
npm-metadata	suspicious-initial-version	AI (npm-metadata): Package is 12 years old with 1.3M weekly downloads and 40 versions. Version 0.0.0 is the legitimate initial release of this well-known EventSource polyfill, not a malicious throwaway.	ai	2026/04/24
bogus-package	bogus-package	AI (bogus-package): Established polyfill with 1.3M weekly downloads. No deps is expected for a pure JS polyfill; README links reference the W3C spec and related resources, not a phishing link farm.	ai	2026/04/24

Versions (showing 40 of 40)

Version	Deps	Published
1.0.31	0 / 3	2022-08-11
1.0.30	0 / 3	2022-08-11
1.0.29	0 / 3	2022-08-11
1.0.28	0 / 3	2022-08-02
1.0.26	0 / 3	2022-03-17
1.0.25	0 / 3	2021-08-04
1.0.24	0 / 3	2021-05-02
1.0.23	0 / 3	2021-04-28
1.0.22	0 / 3	2020-12-09
1.0.21	0 / 3	2020-10-11
1.0.20	0 / 3	2020-09-19
1.0.19	0 / 3	2020-09-17
1.0.18	0 / 3	2020-09-16
1.0.17	0 / 3	2020-08-22
1.0.16	0 / 3	2020-08-06
1.0.15	0 / 3	2020-05-19
1.0.14	0 / 3	2020-05-14
1.0.12	0 / 3	2020-01-11
1.0.11	0 / 3	2019-12-07
1.0.10	0 / 3	2019-12-07
1.0.9	0 / 3	2019-09-27
1.0.8	0 / 3	2019-08-09
1.0.7	0 / 3	2019-06-27
1.0.5	0 / 3	2018-12-07
1.0.4	0 / 3	2018-11-08
1.0.3	0 / 3	2018-10-24
1.0.1	0 / 3	2018-10-24
1.0.0	0 / 3	2018-10-23
0.0.16	0 / 3	2018-08-23
0.0.15	0 / 3	2018-08-22
0.0.14	0 / 3	2018-08-22
0.0.12	0 / 3	2017-11-21
0.0.11	0 / 3	2017-10-14
0.0.10	0 / 3	2017-10-08
0.0.9	0 / 3	2017-01-27
0.0.7	0 / 3	2016-01-28
0.0.6	0 / 2	2015-07-07
0.0.5	0 / 2	2015-05-15
0.0.1	0 / 0	2014-06-10
0.0.0	0 / 0	2014-06-10

v1.0.31

1 finding

LOW No provenance attestation provenance

Package was published without Sigstore provenance. Consider requesting the maintainer enable provenance via CI/CD.

v1.0.30

1 finding

LOW No provenance attestation provenance

Package was published without Sigstore provenance. Consider requesting the maintainer enable provenance via CI/CD.

v1.0.29

1 finding

LOW No provenance attestation provenance

Package was published without Sigstore provenance. Consider requesting the maintainer enable provenance via CI/CD.

v1.0.28

1 finding

LOW No provenance attestation provenance

Package was published without Sigstore provenance. Consider requesting the maintainer enable provenance via CI/CD.

v1.0.26

1 finding

LOW No provenance attestation provenance

Package was published without Sigstore provenance. Consider requesting the maintainer enable provenance via CI/CD.

v1.0.25

1 finding

LOW No provenance attestation provenance

Package was published without Sigstore provenance. Consider requesting the maintainer enable provenance via CI/CD.

v1.0.24

1 finding

LOW No provenance attestation provenance

Package was published without Sigstore provenance. Consider requesting the maintainer enable provenance via CI/CD.

v1.0.23

1 finding

LOW No provenance attestation provenance

Package was published without Sigstore provenance. Consider requesting the maintainer enable provenance via CI/CD.

v1.0.22

1 finding

LOW No provenance attestation provenance

Package was published without Sigstore provenance. Consider requesting the maintainer enable provenance via CI/CD.

v1.0.21

1 finding

LOW No provenance attestation provenance

Package was published without Sigstore provenance. Consider requesting the maintainer enable provenance via CI/CD.

v1.0.20

1 finding

LOW No provenance attestation provenance

Package was published without Sigstore provenance. Consider requesting the maintainer enable provenance via CI/CD.

v1.0.19

1 finding

LOW No provenance attestation provenance

Package was published without Sigstore provenance. Consider requesting the maintainer enable provenance via CI/CD.

v1.0.18

1 finding

LOW No provenance attestation provenance

Package was published without Sigstore provenance. Consider requesting the maintainer enable provenance via CI/CD.

v1.0.17

1 finding

LOW No provenance attestation provenance

Package was published without Sigstore provenance. Consider requesting the maintainer enable provenance via CI/CD.

v1.0.16

1 finding

LOW No provenance attestation provenance

Package was published without Sigstore provenance. Consider requesting the maintainer enable provenance via CI/CD.

v1.0.15

1 finding

LOW No provenance attestation provenance

Package was published without Sigstore provenance. Consider requesting the maintainer enable provenance via CI/CD.

v1.0.14

1 finding

LOW No provenance attestation provenance

Package was published without Sigstore provenance. Consider requesting the maintainer enable provenance via CI/CD.

v1.0.12

1 finding

LOW No provenance attestation provenance

Package was published without Sigstore provenance. Consider requesting the maintainer enable provenance via CI/CD.

v1.0.11

1 finding

LOW No provenance attestation provenance

Package was published without Sigstore provenance. Consider requesting the maintainer enable provenance via CI/CD.

v1.0.10

1 finding

LOW No provenance attestation provenance

Package was published without Sigstore provenance. Consider requesting the maintainer enable provenance via CI/CD.

v1.0.9

1 finding

LOW No provenance attestation provenance

Package was published without Sigstore provenance. Consider requesting the maintainer enable provenance via CI/CD.

v1.0.8

1 finding

LOW No provenance attestation provenance

Package was published without Sigstore provenance. Consider requesting the maintainer enable provenance via CI/CD.

v1.0.7

1 finding

LOW No provenance attestation provenance

Package was published without Sigstore provenance. Consider requesting the maintainer enable provenance via CI/CD.

v1.0.5

1 finding

LOW No provenance attestation provenance

Package was published without Sigstore provenance. Consider requesting the maintainer enable provenance via CI/CD.

v1.0.4

1 finding

LOW No provenance attestation provenance

Package was published without Sigstore provenance. Consider requesting the maintainer enable provenance via CI/CD.

v1.0.3

1 finding

LOW No provenance attestation provenance

Package was published without Sigstore provenance. Consider requesting the maintainer enable provenance via CI/CD.

v1.0.1

1 finding

LOW No provenance attestation provenance

Package was published without Sigstore provenance. Consider requesting the maintainer enable provenance via CI/CD.

v1.0.0

1 finding

LOW No provenance attestation provenance

Package was published without Sigstore provenance. Consider requesting the maintainer enable provenance via CI/CD.

v0.0.16

1 finding

LOW No provenance attestation provenance

Package was published without Sigstore provenance. Consider requesting the maintainer enable provenance via CI/CD.

v0.0.15

1 finding

LOW No provenance attestation provenance

Package was published without Sigstore provenance. Consider requesting the maintainer enable provenance via CI/CD.

v0.0.14

1 finding

LOW No provenance attestation provenance

Package was published without Sigstore provenance. Consider requesting the maintainer enable provenance via CI/CD.

v0.0.12

1 finding

LOW No provenance attestation provenance

Package was published without Sigstore provenance. Consider requesting the maintainer enable provenance via CI/CD.

v0.0.11

1 finding

LOW No provenance attestation provenance

Package was published without Sigstore provenance. Consider requesting the maintainer enable provenance via CI/CD.

v0.0.10

1 finding

LOW No provenance attestation provenance

Package was published without Sigstore provenance. Consider requesting the maintainer enable provenance via CI/CD.

v0.0.9

1 finding

LOW No provenance attestation provenance

Package was published without Sigstore provenance. Consider requesting the maintainer enable provenance via CI/CD.

v0.0.7

1 finding

LOW No provenance attestation provenance

Package was published without Sigstore provenance. Consider requesting the maintainer enable provenance via CI/CD.

v0.0.6

1 finding

LOW No provenance attestation provenance

Package was published without Sigstore provenance. Consider requesting the maintainer enable provenance via CI/CD.

v0.0.5

2 findings

HIGH Publisher changed: lakenen → yaffle (on 2015-05-15) provenance

This version was published by a different npm account than previous versions on 2015-05-15. This could indicate a legitimate maintainer transition or an account compromise.

LOW No provenance attestation provenance

Package was published without Sigstore provenance. Consider requesting the maintainer enable provenance via CI/CD.

v0.0.1

1 finding

LOW No provenance attestation provenance

Package was published without Sigstore provenance. Only ~12% of npm packages have provenance, so this is common but not ideal.

v0.0.0

1 finding

LOW No provenance attestation provenance

Package was published without Sigstore provenance. Only ~12% of npm packages have provenance, so this is common but not ideal.