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The NPM package repository contains over two million packages and serves tensof billions of downloads per-week. Nearly every single JavaScript applicationuses the NPM package manager to install packages from the NPM repository. NPMrelies on a "semantic versioning" ('semver') scheme to maintain a healthyecosystem, where bug-fixes are reliably delivered to downstream packages asquickly as possible, while breaking changes require manual intervention bydownstream package maintainers. In order to understand how developers usesemver, we build a dataset containing every version of every package on NPM andanalyze the flow of updates throughout the ecosystem. We build atime-travelling dependency resolver for NPM, which allows us to determineprecisely which versions of each dependency would have been resolved atdifferent times. We segment our analysis to allow for a direct analysis ofsecurity-relevant updates (those that introduce or patch vulnerabilities) incomparison to the rest of the ecosystem. We find that when developers usesemver correctly, critical updates such as security patches can flow quiterapidly to downstream dependencies in the majority of cases (90.09%), but thisdoes not always occur, due to developers' imperfect use of both semver versionconstraints and semver version number increments. Our findings haveimplications for developers and researchers alike. We make our infrastructureand dataset publicly available under an open source license.

A Large Scale Analysis of Semantic Versioning in NPM