npm-utils

Async NPM shell commands: install, test, etc.

Use

var npmUtils = require('npm-utils');
npmUtils.version()
  .then(function (semver) {
    console.log('NPM version %s', semver);
  });

API

NPM command path

path() // returns immediately path to npm command

Install

install({
  name: string,
  version: string (optional),
  prefix: string (optional), // folder path prefix
  passThroughData: obj (optional),
  registry: string (optional) // registry url,
  flags: ['--save', '--verbose'] // list of command line flags to pass to NPM
})

returns a promise

Note: the name could be another folder or a tar archive; passed to npm install <name> unchanged, that can be any match. See npm help install.

Without name property, it just runs npm install in the current folder.

repoInstall

Clones Git repository for given NPM module and installs dependencies in the cloned folder.

repoInstall({
  name: string, // NPM module name
  folder: string // destination new folder to create
})

Returns a promise

Version

version() // returns a promise, resolved with NPM version string

Test

test() // spawns npm test command
test('grunt test'); // spawns new command "grunt test"

The child test process will inherit output streams from the parent.

registryUrl

registryUrl();
// returns a promise resolved with result of https://github.com/sindresorhus/registry-url
// pass scope for specific registry
registryUrl('@myCo')
  .then(url => ...)

publish

publish({ tag: '...'});
// the tag is optional

getPackage

Loads package.json from a given folder

var pkg = npm.getPackage(folder);
console.log('%s version %s', pkg.name, pkg.version);

pack

Runs npm pack <folder name> command. Resolves with the name of the generated tarball file.

pack({ folder: 'path/to/folder' })

If folder is not provided, uses the current one

setAuthToken

Please execute the npm login first!

setAuthToken()
    .then(canPublishNow, onError)

Updates local .npmrc (if found) or profile ~/.npmrc file that can be used by CI servers to publish to NPM. The file will have the following line added (only the actual registry url will be used)

//registry.npmjs.org/:_authToken=${NPM_TOKEN}

Read the Deploying with npm private modules for details, see project ci-publish for example how this could be used to release from CI after successful tests.

Often the source of errors is that the environment does not have NPM_TOKEN set, or the .npmrc file already has the authToken entry for this registry. For example, when running locally

$ NPM_TOKEN=foo node src/set-auth-token.js
npmrc file already has auth token for registry
//registry.npmjs.org/:_authToken=
[Error: Auth token for registry exists //registry.npmjs.org/:_authToken=]

increment or set package version

Runs npm version [major | minor | patch | version] command.

incrementVersion({
  increment: 'major|minor|patch|semver version',
  noGit: true // default false = Git commit happens
})
// example
incrementVersion({
  increment: '2.0.1'
})

See npm help version.

Prune dependencies

require('npm-utils').prune().catch(console.error);
// same as "npm prune"

Bin commands

Set auth token name

Often the CI needs an auth token for a registry to be able to install private modules. The CI should have NPM_TOKEN environment variable set, and the next command adds the following to the .npmrc or ~/.npmrc file

//registry.npmjs.org/:_authToken=${NPM_TOKEN}

You can use it like this. From the CI build file (circle.yml, .travis.yml etc) first install this package, then call the command, and then install all modules (including the private ones)

npm i npm-utils
$(npm bin)/set-auth-token-var-name
npm i

Related

• ggit - Git utils

Troubleshooting

Run the command with DEBUG=npm-utils environment variable set, this package uses debug

Small print

Author: Gleb Bahmutov @ 2013 @bahmutov

License: MIT - do anything with the code, but don't blame me if it does not work.

• @bahmutov
• glebbahmutov.com
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