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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 isString = require( '@stdlib/assert/is-string' ).isPrimitive;
var RE_EXTNAME = require( '@stdlib/regexp/extname' ).REGEXP;
var format = require( '@stdlib/string/format' );
// MAIN //
/**
* Returns a filename extension.
*
* @param {string} filename - filename
* @throws {TypeError} must provide a string primitive
* @returns {string} filename extension
*
* @example
* var ext = extname( 'index.js' );
* // returns '.js'
*/
function extname( filename ) {
if ( !isString( filename ) ) {
throw new TypeError( format( 'invalid argument. Filename must be a string. Value: `%s`.', filename ) );
}
return RE_EXTNAME.exec( filename )[ 1 ];
}
// EXPORTS //
module.exports = extname;
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