array.prototype.flat
An ES2019 spec-compliant `Array.prototype.flat` shim/polyfill/replacement that works as far down as ES3.
1
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
ljharb
Keywords
Array.prototype.flattenArray.prototype.flatflattenflatarrayESnextshimpolyfillflatMapArray.prototype.flatMapes-shim API
Accepted risks
Findings the reviewer chose to accept rather than block on.
| Source | Rule | Reason | Accepted by | When |
|---|---|---|---|---|
| dependencies | unvetted-dep:define-properties | AI (dependencies): define-properties is a well-known es-shims utility authored by the same maintainer (ljharb); its use here is standard and expected across all es-shim polyfill packages. | ai | |
| provenance | no-provenance | AI (provenance): ljharb's packages consistently lack Sigstore provenance; this is a known pattern for this publisher and not a risk indicator. | ai |
Versions (showing 1 of 1)
| Version | Deps | Published |
|---|---|---|
| 1.3.3 | 4 / 15 |