Quiz · 5 questions

📦 The Module System

CJS, ESM, package.json, semver, and the npm/pnpm/bun ecosystem

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Quiz

01A .js file with no package.json nearby — how does Node decide whether to load it as CJS or ESM?

02What does the package.json exports field do that main doesn't?

03Your dependency is listed as "react": "^19.2.0". Which of these is npm update allowed to install?

04Why does pnpm use a content-addressable store and symlinks instead of npm's flat-hoisted node_modules?

05You're building a React component library. Where does react belong in your package.json?

Hint

Think about what happens if both your library and the consuming app each install React separately. Two copies, two useState functions, two registries of hook state — they don't talk to each other.

← PreviousWorkspaces and Monorepos 🎼 Async — Callbacks, Promises, and the Modern Toolkit →Callbacks — How Node Started Its Async Life

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