Ubuntu Manpage: npm-developers

NAME

       npm-developers - Developer Guide

DESCRIPTION

       So, you´ve decided to use npm to develop (and maybe publish/deploy) your project.

       Fantastic!

       There  are a few things that you need to do above the simple steps that your users will do
       to install your program.

About These Documents

       These are man pages. If you install npm, you should be able to then do  man  npm-thing  to
       get  the  documentation  on  a  particular  topic,  or  npm  help  thing  to  see the same
       information.

What is a <code>package</code>

       A package is:

       •   a) a folder containing a program described by a package.json file

       •   b) a gzipped tarball containing (a)

       •   c) a url that resolves to (b)

       •   d) a <name>@<version> that is published on the registry with (c)

       •   e) a <name>@<tag> that points to (d)

       •   f) a <name> that has a "latest" tag satisfying (e)

       •   g) a git url that, when cloned, results in (a).

       Even if you never publish your package, you can still get a lot of benefits of  using  npm
       if  you  just want to write a node program (a), and perhaps if you also want to be able to
       easily install it elsewhere after packing it up into a tarball (b).

       Git urls can be of the form:

           git://github.com/user/project.git#commit-ish
           git+ssh://user@hostname:project.git#commit-ish
           git+http://user@hostname/project/blah.git#commit-ish
           git+https://user@hostname/project/blah.git#commit-ish

       The commit-ish can be any tag, sha, or branch which can be supplied as an argument to  git
       checkout. The default is master.

The package.json File

You need to have a package.json file in the root of your project to do much of anything
with npm. That is basically the whole interface.

npm help See package.json for details about what goes in that file. At the very least,
you need:

name This should be a string that identifies your project. Please do not use the name to
specify that it runs on node, or is in JavaScript. You can use the "engines" field
to explicitly state the versions of node (or whatever else) that your program
requires, and it´s pretty well assumed that it´s javascript.

It does not necessarily need to match your github repository name.

So, node-foo and bar-js are bad names. foo or bar are better.

version
A semver-compatible version.

engines
Specify the versions of node (or whatever else) that your program runs on. The node
API changes a lot, and there may be bugs or new functionality that you depend on.
Be explicit.

author Take some credit.

scripts
npm help If you have a special compilation or installation script, then you should
put it in the scripts hash. You should definitely have at least a basic smoke-test
command as the "scripts.test" field. See npm-scripts.

main If you have a single module that serves as the entry point to your program (like
what the "foo" package gives you at require("foo")), then you need to specify that
in the "main" field.

directories
This is a hash of folders. The best ones to include are "lib" and "doc", but if you
specify a folder full of man pages in "man", then they´ll get installed just like
these ones.

npm help You can use npm init in the root of your package in order to get you started with
a pretty basic package.json file. See npm-init for more info.

Keeping files <em>out</em> of your package

       Use  a  .npmignore  file to keep stuff out of your package. If there´s no .npmignore file,
       but there is a .gitignore file, then npm will ignore the stuff matched by  the  .gitignore
       file.  If  you want to include something that is excluded by your .gitignore file, you can
       create an empty .npmignore file to override it.

       By default, the following paths and files are ignored, so there´s no need to add  them  to
       .npmignore explicitly:

       •   .*.swp

       •   ._*

       •   .DS_Store

       •   .git

       •   .hg

       •   .lock-wscript

       •   .svn

       •   .wafpickle-*

       •   CVS

       •   npm-debug.log

       Additionally,  everything in node_modules is ignored, except for bundled dependencies. npm
       automatically handles this for you, so don´t bother adding node_modules to .npmignore.

       The following paths and  files  are  never  ignored,  so  adding  them  to  .npmignore  is
       pointless:

       •   package.json

       •   README.*

Link Packages

       npm  link  is  designed  to install a development package and see the changes in real time
       without having to keep re-installing it. (You do need to either re-link or npm rebuild  -g
       to update compiled packages, of course.)

       npm help More info at npm-link.

Before Publishing: Make Sure Your Package Installs and Works

       This is important.

       If  you  can  not install it locally, you´ll have problems trying to publish it. Or, worse
       yet, you´ll be able to publish it, but you´ll be publishing a broken or pointless package.
       So don´t do that.

       In the root of your package, do this:

           npm install . -g

       That´ll  show  you  that  it´s working. If you´d rather just create a symlink package that
       points to your working directory, then do this:

           npm link

       Use npm ls -g to see if it´s there.

       To test a local install, go into some other folder, and then do:

           cd ../some-other-folder
           npm install ../my-package

       to install it locally into the node_modules folder in that other place.

       Then go into the node-repl, and try using require("my-thing") to bring  in  your  module´s
       main module.

Create a User Account

       Create a user with the adduser command. It works like this:

           npm adduser

       and then follow the prompts.

       npm help This is documented better in npm-adduser.

Publish your package

       This part´s easy. IN the root of your folder, do this:

           npm publish

       You  can  give  publish  a  url  to  a tarball, or a filename of a tarball, or a path to a
       folder.

       Note that pretty much everything in that folder will be exposed by  default.  So,  if  you
       have  secret  stuff  in  there,  use a .npmignore file to list out the globs to ignore, or
       publish from a fresh checkout.

Brag about it

       Send emails, write blogs, blab in IRC.

       Tell the world how easy it is to install your program!