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* @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 validate = require( './validate.js' );
var defaults = require( './defaults.js' );
var mergefcn = require( './mergefcn.js' );
// MAIN //
/**
* Returns a function for merging and extending objects.
*
* @param {Options} options - merge options
* @param {number} [options.level=Infinity] - merge level
* @param {boolean} [options.copy=true] - boolean indicating whether to deep copy merged values
* @param {(boolean|Function)} [options.override=true] - defines the merge strategy
* @param {boolean} [options.extend=true] - boolean indicating whether new properties can be added to the target object
* @throws {TypeError} must provide valid options
* @returns {Function} function which can be used to merge objects
*
* @example
* var opts = {
* 'level': 100,
* 'copy': true,
* 'override': true,
* 'extend': true
* };
*
* var merge = factory( opts );
* // returns <Function>
*/
function factory( options ) {
var opts;
var err;
opts = defaults();
err = validate( opts, options );
if ( err ) {
throw err;
}
return mergefcn( opts );
}
// EXPORTS //
module.exports = factory;
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