run-versions

Run a script across multiple versions of an npm package

Install

$ npm install --save run-versions

Usage

var run = require('run-versions')
run({
  name: 'xtend',
  command: 'npm ls xtend',
  versions: ['3.0.0', '4.0.0']
}, done)
//=> done(null, [{version: '3.0.0', passed: true}, {version: '4.0.0', passed: true}])

API

run(options, callback) -> eventEmitter

Iterates through the supplied versions, running the specified shell command at each version. For details on events, see the events documentation.

options

Required
Type: object

Configuration objects for the runner:

name

Required
Type: string

The name of the package to install.

command

Required
Type: string

The command to run on each version.

versions

Required
Type: array[string]

Versions to install and run against.

npm

Type: boolean
Default: false

Set to true to treat the command as an npm script.

child_process

Type: object
Default: {}

Options to pass to spawned child processes.

bail

Type: boolean
Default: false

Call the callback immediately with an error if any test fails.

callback

Required
Type: function
Arguments: err, results

A callback to be called when the run completes. Installation errors are considered fatal, while test errors are only fatal when options.bail is set.

results

Type: array[object]

An array of objects with properties version (string) and passed (boolean) indicating test results.

Events

A script runner is an EventEmitter and emits various events during its lifecycle. These events are:

• preinstall
• postinstall
• prescript
• postscript
• result
• preuninstall
• postuninstall

All events receive the current version as the first argument. pre events receive the child process used to execute the installation/script/uninstallation as the second argument. The result event receives the test result (pass/fail) as the second argument. post events receive only one argument.

run(config, callback)
  .on('postinstall', function (version) {
    console.log('Installed', version)
  })
  .on('prescript', function (version, child) {
    child.stdout.pipe(process.stdout)
  })

Note that you can use {stdio: 'inherit'} in the child_process option if you'd prefer to pass through all output (install and uninstall logs), not just the script.

License

MIT © Ben Drucker