is-valid-instance

is-valid-instance

Returns true if a value is a valid instance of Base.

Install

Install with npm:

$ npm install --save is-valid-instance

Usage

Use in your base plugin to ensure that the plugin is registered on a valid instance.

var isValidInstance = require('is-valid-instance');

function plugin(app) {
  if (!isValidInstance(app)) return;
  // do plugin stauff
}

API

Params

• val {Object}
• names {Array|Function}: One or more names to check for on the given instance. Example app will check for app.isApp === true or app._name === 'app'.
• fn {Function}: Custom function for validating the instance.
• returns {Boolean}

Example

function plugin(app) {
  if (!isValidInstance(app)) return;
  // do plugin stuff
}

Examples

Collection instance

Return true if the instance is a templates view-collection (views):

function plugin(collection) {
  if (!isValidInstance(collection, ['views'])) {
    // optionally return the plugin function so the plugin is re-tried on 
    // each instance until it finds the correct one
    return plugin;
  }
  // do plugin stauff
}

View instance

Return true if the instance is a templates view:

function plugin(view) {
  if (!isValidInstance(view, ['view'])) {
    return plugin;
  }
  // do plugin stauff
}

View instance

Return true if the instance is either "app" or "collection":

function plugin(app) {
  if (!isValidInstance(app, ['app', 'collection'])) {
    return plugin;
  }
  // do plugin stauff
}

About

Related projects

• base-app: Starting point for creating a base application, with a few light plugins for running tasks… more | homepage
• base-plugins: Upgrade's plugin support in base applications to allow plugins to be called any time after… more | homepage
• base: base is the foundation for creating modular, unit testable and highly pluggable node.js applications, starting… more | homepage

Contributing

Pull requests and stars are always welcome. For bugs and feature requests, please create an issue.

Building docs

(This project's readme.md is generated by verb, please don't edit the readme directly. Any changes to the readme must be made in the .verb.md readme template.)

To generate the readme, run the following command:

$ npm install -g verbose/verb#dev verb-generate-readme && verb

Running tests

Running and reviewing unit tests is a great way to get familiarized with a library and its API. You can install dependencies and run tests with the following command:

$ npm install && npm test

Author

Jon Schlinkert

• github/jonschlinkert
• twitter/jonschlinkert

License

Copyright © 2017, Jon Schlinkert. Released under the MIT License.

This file was generated by verb-generate-readme, v0.4.3, on March 24, 2017.