MERN Stack Development teaches npm 2,036 as a working tool: package.json, semver ranges, lockfiles and npm ci (Python's pip and uv-Java's Maven and Gradle), publishing, dist-tags and provenance (1.14.4-1.14.7), workspaces and Changesets 12,450 (1.14.8-1.14.10), and npm audit, install scripts and typosquatting (1.15.1-1.15.3). This chapter takes npm as the baseline and covers what MERN Stack Development does not: Yarn 11,798 , pnpm 69,400 , Bun 73,307 , Corepack 3,816 and Bower 80,366 (Yarn Classic and Yarn Berry-Bower and the Pre-npm Era), resolution and registries (1.9-1.10), OS and other-language package managers (1.11-1.14), and supply-chain attacks across ecosystems (Supply-Chain Security). Everything here ran for real with Node.js 24.21.0 2,131 , npm 11.19.0, Yarn 4.18.1, pnpm 12.6.0 and Bun 1.4.2.
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What This Chapter Covers and What Volume 2 Already Does