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 isDateObject = require( '@stdlib/assert-is-date-object' );
  var isString = require( '@stdlib/assert-is-string' ).isPrimitive;
  var isInteger = require( '@stdlib/assert-is-integer' ).isPrimitive;
  var lowercase = require( '@stdlib/string-lowercase' );
  var isLeapYear = require( '@stdlib/assert-is-leap-year' );
  var DAYS_IN_MONTH = require( './days.json' );
  
  
  // MAIN //
  
  /**
  * Returns the number of days in a month.
  *
  * @param {(string|Date|integer)} [month] - month (or Date)
  * @param {integer} [year] - year
  * @throws {TypeError} first argument must be either a string, integer, or `Date` object
  * @throws {Error} must provide a recognized month
  * @throws {RangeError} an integer month argument must be on the interval `[1,12]`
  * @throws {TypeError} second argument must be an integer
  * @returns {integer} days in a month
  *
  * @example
  * var num = daysInMonth();
  * // returns <number>
  *
  * @example
  * var num = daysInMonth( 2 );
  * // returns <number>
  *
  * @example
  * var num = daysInMonth( 2, 2016 );
  * // returns 29
  *
  * @example
  * var num = daysInMonth( 2, 2017 );
  * // returns 28
  */
  function daysInMonth( month, year ) {
  	var days;
  	var mon;
  	var yr;
  	var d;
  	if ( arguments.length === 0 ) {
  		// Note: cannot cache as application may cross over into a new year:
  		d = new Date();
  		mon = d.getMonth() + 1; // zero-based
  		yr = d.getFullYear();
  	} else if ( arguments.length === 1 ) {
  		if ( isDateObject( month ) ) {
  			d = month;
  			mon = d.getMonth() + 1; // zero-based
  			yr = d.getFullYear();
  		} else if ( isString( month ) || isInteger( month ) ) {
  			// Note: cannot cache as application may cross over into a new year:
  			yr = ( new Date() ).getFullYear();
  			mon = month;
  		} else {
  			throw new TypeError( 'invalid argument. First argument must be either a string, integer, or `Date` object. Value: `'+month+'`.' );
  		}
  	} else {
  		if ( !isString( month ) && !isInteger( month ) ) {
  			throw new TypeError( 'invalid argument. First argument must be either a string or integer. Value: `'+month+'`.' );
  		}
  		if ( !isInteger( year ) ) {
  			throw new TypeError( 'invalid argument. Second argument must be an integer. Value: `'+year+'`.' );
  		}
  		mon = month;
  		yr = year;
  	}
  	if ( isInteger( mon ) && (mon < 1 || mon > 12) ) {
  		throw new RangeError( 'invalid argument. An integer month value must be on the interval `[1,12]`. Value: `'+mon+'`.' );
  	}
  	mon = lowercase( mon.toString() );
  	days = DAYS_IN_MONTH[ mon ];
  	if ( days === void 0 ) {
  		throw new Error( 'invalid argument. Must provide a recognized month. Value: `'+mon+'`.' );
  	}
  	if ( days === 28 && isLeapYear( yr ) ) {
  		days += 1;
  	}
  	return days;
  }
  
  
  // EXPORTS //
  
  module.exports = daysInMonth;
  