if-node-version


Run a shell command if it's on the node of specified versions.

``bash
$ if-node-version ">=4" eslint lib test
`

`bash
$ if-node-version "<6" node ./scripts/fallback.js
`

Maybe this helps you together with [npm-scripts].

Installation

if-node-version can be installed with [npm].

`bash
$ npm install --save-dev if-node-version
`

- if-node-version requires Node.js >=0.10.0

Usage

$3

`
Usage:
$ if-node-version [...args]

Run a shell command if it's on the node of specified versions.
Otherwise, do nothing.

Exit code is the exit code of the .

$ if-node-version

Check if it's on the node of specified versions.

Exit code is 0 if it's on the node of specified versions.
Otherwise, exit code is 1.

$ if-node-version --help

Show this help text.

$ if-node-version --version

Show the version number of if-node-version command.

Parameters:
.... A text which specifies the version range of Node.js
This text format is defined by node-semver module:
https://www.npmjs.com/package/semver#ranges
......... The shell command to execute.
[...args] ......... Parameters of the shell command.

Examples:
$ if-node-version ">=4" eslint lib test
$ if-node-version "<6" node ./scripts/fallback.js
`

$3

`js
var spawnIfNodeVersion = require("if-node-version")
`

#### spawnIfNodeVersion(versionRange, command, args, options)

Spawn a child process with specified parameters if the node version satisfies a given version range.

This function returns [child_process.ChildProcess] object.

- versionRange {string} - A text which specifies the version range of Node.js. This text format is defined by node-semver module: https://www.npmjs.com/package/semver#ranges
- command {string} - The command to run.
- args {Array.} - List of string arguments.
- options {object} - An option object. See [the document of child_process.spawn]

#### spawnIfNodeVersion.sync(versionRange, command, args, options)

This is synchronous version of spawnIfNodeVersion(versionRange, command, args, options).

This function returns the object as same as [child_process.spawnSync].

Note: If you use this function on node 0.10, you will also need to install [spawn-sync].

Changelogs

- [GitHub Releases]

Contributing

Welcome your contributions!

Please use GitHub's issues/PRs.

$3

- npm install installs dependencies.
- npm test runs tests and measures coverage.
- npm run coverage opens the coverage result of npm test.
- npm run clean removes the coverage result of npm test.
- npm run lint analyzes codes by ESLint.
- npm run watch runs tests (without coverage measurement) when source code is modified.


[npm]: https://www.npmjs.com/
[npm-scripts]: https://docs.npmjs.com/misc/scripts
[child_process.ChildProcess]: https://nodejs.org/api/child_process.html#child_process_class_childprocess
[the document of child_process.spawn`]: https://nodejs.org/api/child_process.html#child_process_child_process_spawn_command_args_options
[child_process.spawnSync]: https://nodejs.org/api/child_process.html#child_process_child_process_spawnsync_command_args_options
[spawn-sync]: https://www.npmjs.com/package/spawn-sync
[GitHub Releases]: https://github.com/mysticatea/if-node-version/releases