* Get current working directory.

* Indicates if a specific plugin is used by the project * @param {string} id Plugin id or short id

* Display a notification in the user OS * @param {object} options Notification options

* Register an handler called when a config is red. * * @param {function} cb Handler

* Register an handler called when a view is open. * * @param {function} cb Handler

* Call a Plugin action. This can also listened by client addon components. * * @param {string} id Id of the action * @param {object} params P

* Describe a project configuration (usually for config file like `.eslintrc.json`). * * @param {object} options Configuration description

* Add a listener to the IPC messages. * * @param {function} cb Callback with 'data' param

* Push a callback to be called when the files have been written to disk. * * @param {function} cb

* Arrange plugins by 'after' property. * @param {Array<Plugin>} plugins * @returns {Array<Plugin>}

* Resolves the data when rendering templates. * * @private

* Register a dev serve config function. It will receive the express `app` * instance of the dev server. * * @param {function} fn