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Lesson 29 / 30

Publishing to npm

Publish a package to the npm registry: unique name, versioning, npm login, bin field and npm publish.

What publish needs

A unique name, a version, an npm login, and a bin field if it's a CLI tool — then npm publish uploads it to the registry.

publish workflow

Bump the version before every publish — npm rejects re-publishing the same version number.

npm login
npm version patch      # 1.0.0 -> 1.0.1
npm publish

Quick check: Why does npm version patch matter before publishing an update?

  • npm refuses to publish a version number that already exists on the registry
  • It compiles the code
  • It deletes the previous version
  • It uploads the code automatically
Answer

npm refuses to publish a version number that already exists on the registry — The registry treats each version as immutable — you must bump the number to publish new changes.

Final quiz 1 of 8

Final quiz

Quick check: What makes Node able to handle many connections with one thread?

  • One thread per request
  • Compiling to C++
  • Non-blocking I/O and the event loop
  • A built-in database
Answer

Non-blocking I/O and the event loop — Waiting I/O is handed off while the loop serves other work.

Final quiz 2 of 8

Final quiz

Quick check: Which field enables ES module syntax in package.json?

  • "main": "esm"
  • "es": true
  • "import": "all"
  • "type": "module"
Answer

"type": "module" — Set type to module (or use .mjs).

Final quiz 3 of 8

Final quiz

Quick check: What does ^4.19.2 allow?

  • Minor and patch updates below 5.0.0
  • Only patch updates
  • Major updates
  • No updates
Answer

Minor and patch updates below 5.0.0 — Caret allows compatible updates within the same major version.

Final quiz 4 of 8

Final quiz

Quick check: Why use fs/promises inside a server handler?

  • It is shorter
  • It does not block the event loop
  • It encrypts files
  • It needs no import
Answer

It does not block the event loop — Async file calls let other requests continue.

Final quiz 5 of 8

Final quiz

Quick check: Which method connects a readable stream to a writable stream with backpressure?

  • push
  • emit
  • pipe (or pipeline)
  • spawn
Answer

pipe (or pipeline) — pipe and stream.pipeline manage flow control for you.

Final quiz 6 of 8

Final quiz

Quick check: How do you run independent async calls together?

  • Await them one by one
  • setTimeout
  • process.exit
  • Promise.all
Answer

Promise.all — Promise.all runs them concurrently and waits for all.

Final quiz 7 of 8

Final quiz

Quick check: What should you do after an uncaughtException?

  • Log it and exit the process
  • Ignore it
  • Retry forever
  • Delete node_modules
Answer

Log it and exit the process — The process may be in an unknown state, so exit and let a supervisor restart it.

Final quiz 8 of 8

Final quiz

Quick check: Which Node module moves CPU-heavy work off the main thread?

  • path
  • worker_threads
  • os
  • dotenv
Answer

worker_threads — Worker threads keep the event loop responsive.