Parse package.json files and determine a version for npm, node or iojs.
$ npm install get-version
There are 3 supported engines: npm, node and iojs.
$ get-version --engine <engine> /path/to/package.json
> 0.12.0
get-version returns a promise.
var getVersion = require('get-version');
getVersion('npm', '/path/to/package.json').then(success, failure);success receives a string of the resolved version.
failure receives an instance of Error.
If no package.json file is specified, get-version will return the latest version for the specified engine.
get-version will use semantic versioning to find versions for both npm and iojs if one is not specified.
Since node uses it's own versioning system, semantic versioning is not used to find node versions. It uses the following rules to evaluate node versions:
- If
latestor*are specified, the latest stable version of node will be used. - If a valid node version cannot be found, get-version will attempt to find an appropriate version of iojs and use it instead.
- If neither a node nor iojs version can be found, the latest stable version of node will be used.
- If the node engine is requested but an iojs key/value is present in the engines property of the package.json, iojs will be used without a fallback to node.
The MIT License (MIT)
Copyright (c) 2015 Modulus
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.