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 isObject = require( '@stdlib/assert/is-plain-object' );
  var hasOwnProp = require( '@stdlib/assert/has-own-property' );
  var isString = require( '@stdlib/assert/is-string' ).isPrimitive;
  var isStringArray = require( '@stdlib/assert/is-string-array' ).primitives;
  
  
  // VARIABLES //
  
  var RE = /package\.json$/;
  
  
  // MAIN //
  
  /**
  * Validates function options.
  *
  * @private
  * @param {Object} opts - destination object
  * @param {Options} options - function options
  * @param {string} [options.dir] - root directory from which to search for package CLIs
  * @param {string} [options.pattern] - glob pattern
  * @param {StringArray} [options.ignore] - glob pattern(s) to exclude matches
  * @returns {(Error|null)} error object or null
  *
  * @example
  * var opts = {};
  * var options = {
  *     'dir': '/foo/bar/baz'
  * };
  *
  * var err = validate( opts, options );
  * if ( err ) {
  *    throw err;
  * }
  */
  function validate( opts, options ) {
  	if ( !isObject( options ) ) {
  		return new TypeError( 'invalid argument. Options argument must be an object. Value: `' + options +
  			'`.' );
  	}
  	if ( hasOwnProp( options, 'dir' ) ) {
  		opts.dir = options.dir;
  		if ( !isString( opts.dir ) ) {
  			return new TypeError( 'invalid option. `dir` option must be a primitive string. Option: `' + opts.dir + '`.' );
  		}
  	}
  	if ( hasOwnProp( options, 'pattern' ) ) {
  		opts.pattern = options.pattern;
  		if ( !isString( opts.pattern ) ) {
  			return new TypeError( 'invalid option. `pattern` option must be a primitive string. Option: `' + opts.pattern + '`.' );
  		}
  		if ( !RE.test( opts.pattern ) ) {
  			return new Error( 'invalid option. `pattern` option must end with `package.json`. Option: `' + opts.pattern +'`.' );
  		}
  	}
  	if ( hasOwnProp( options, 'ignore' ) ) {
  		opts.ignore = options.ignore;
  		if ( !isStringArray( opts.ignore ) ) {
  			return new TypeError( 'invalid option. `ignore` option must be a string array. Option: `' + opts.ignore + '`.' );
  		}
  	}
  	return null;
  }
  
  
  // EXPORTS //
  
  module.exports = validate;
  