text: /**
  * @license Apache-2.0
  *
  * Copyright (c) 2018 The Stdlib Authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
  *    http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
  
  'use strict';
  
  // MODULES //
  
  var logger = require( 'debug' );
  var isString = require( '@stdlib/assert/is-string' ).isPrimitive;
  
  
  // VARIABLES //
  
  var debug = logger( 'plot:base:set:description' );
  
  
  // MAIN //
  
  /**
  * Sets the description.
  *
  * @private
  * @param {string} str - description
  * @throws {TypeError} must be a string primitive
  */
  function set( str ) {
  	/* eslint-disable no-invalid-this */
  	if ( !isString( str ) ) {
  		throw new TypeError( 'invalid value. `description` must be a string. Value: `' + str + '.`' );
  	}
  	if ( str !== this._description ) {
  		debug( 'Current value: %s.', this._description );
  
  		this._description = str;
  		debug( 'New value: %s.', this._description );
  
  		this.emit( 'change' );
  	}
  }
  
  
  // EXPORTS //
  
  module.exports = set;
  