runtime-npm-install

Install npm modules programmatically

key features

• under the hood, uses globally installed npm through npm-install-to
• takes packages in the equivalent format as npm install
  • @scope/name
  • name@tag/version
  • githubusername/repo
  • etc.
• once installed packages will resolve instantly due to caching

install

npm install runtime-npm-install

usage

Provides two functions, of which npmInstallAsync returns metadata of installed modules, while npmImportAsync returns a list of what installed modules export.

The argument installPath determines where modules should be npm installed on the file system. It defaults to a temporary directory, but should be given if you wish subsequent invocations to either function to be quick. See npm-install-to for more on the caching.

The argument of packages is a list of package specs as strings, corresponding to how npm install command is given packages to be installed. More information on that available with npm help install.

API

npmInstallAsync(packages: string[], installPath?: string, npmInstallToOpts?: Object): Promise<...>

Installs specified packages, returning a promise that resolves to an object containing output of npm install and metadata of installed packages.

example

const { npmInstallAsync } = require('../')
const path = require('path')
const tmpDir = path.join(require('os').tmpdir(), 'my-app')
npmInstallAsync([
  '[email protected]',
  'lodash',
  '[email protected]'
], tmpDir)
.then(console.log)

output

{ packages:
   [ { spec: '[email protected]',
       name: 'treis',
       json: [Object],
       path:
        '/var/folders/5w/g91lyqdd20b4wsrb2r434nwr0000gn/T/my-app/node_modules/treis' },
     { spec: 'lodash',
       name: 'lodash',
       json: [Object],
       path:
        '/var/folders/5w/g91lyqdd20b4wsrb2r434nwr0000gn/T/my-app/node_modules/lodash' },
     { spec: '[email protected]',
       name: 'ramda',
       json: [Object],
       path:
        '/var/folders/5w/g91lyqdd20b4wsrb2r434nwr0000gn/T/my-app/node_modules/ramda' } ],
  npmOutput:
   '+ [email protected]\n+ [email protected]\n+ [email protected]\nadded 12 packages from 9 contributors and audited 15 packages in 1.492s\nfound 0 vulnerabilities' }

npmImportAsync(packages: string[], installPath?: string, npmInstallToOpts?: Object): Promise<...>

Installs specified packages, returning exports corresponding to each package as a list.

getPkgsToBeInstalled(packages: string[], installPath: string): Promise<string[]>

Use to check which given packages would be installed by either of the functions.

This function comes directly from npm-install-to.

example

const { npmImportAsync } = require('runtime-npm-install')

;(async () => {
  const [treis, _, R] = await npmImportAsync([
    '[email protected]',
    'lodash',
    '[email protected]'
  ])

  R.add(1, _.add(5, 1)) // 7
})()

demo of debug logging and cache

const { npmInstallAsync } = require('npm-install-to')
const path = require('path')
const taim = require('taim')

const tmpDir = path.join(require('os').tmpdir(), 'my-app')
console.log('tmpDir', tmpDir)

;(async () => {
  await taim('first npmInstallAsync', npmInstallAsync)([
    '[email protected]',
    'lodash',
    '[email protected]'
  ], tmpDir)

  await taim('second npmInstallAsync', npmInstallAsync)([
    '[email protected]',
    'lodash',
    '[email protected]'
  ], tmpDir)
})()