A research paper "Investigating The Reproducibility of NPM Packages"[0] found that "Among the 3,390 versions of the 226 packages, only 2,087 versions are reprod

A research paper "Investigating The Reproducibility of NPM Packages"[0] found that "Among the 3,390 versions of the 226 packages, only 2,087 versions are reproducible". (Coincidentally that paper was published in September 2020 too). There was an earlier project called "Trust But Verify"[1] which tried to detect discrepancies between published NPM packages and the corresponding (inferred) tag/commit in the source repository, but sadly it doesn't seem to have gained traction. Interestingly, the "Gold" standard of the Core Infrastructure Initiative (CII) Best Practices guide[2] is to have a reproducible build, but it is only "SUGGESTED that projects identify each release within their version control system", so presumably packages are free to indicate which commit they are built from in an ad hoc out-of-band way, which may not be amenable to automated third-party checking. [0] https://people.cs.vt.edu/nm8247/publications/icsme-camera-ready-2020.pdf https://people.cs.vt.edu/nm8247/publications/icsme-camera-re... [1] https://hackernoon.com/what-if-we-could-verify-npm-packages-c2a319cff758 https://hackernoon.com/what-if-we-could-verify-npm-packages-... [2] https://bestpractices.coreinfrastructure.org/en/criteria https://bestpractices.coreinfrastructure.org/en/criteria