function writablePropertyNames( value ) {
	var names;
	var i;
	var n;

	if ( value === null || value === void 0 ) {
		return [];
	}
	names = getOwnPropertyNames( Object( value ) );
	n = 0;
	for ( i = 0; i < names.length; i++ ) {
		if ( isWritableProperty( value, names[ i ] ) ) {
			names[ n ] = names[ i ];
			n += 1;
		}
	}
	names.length = n;

	return names;
}
Returns an array of an object's own writable property names.

@param {*} value - input object
@returns {Array} a list of own writable property names

@example
var defineProperty = require( '@stdlib/utils/define-property' );

var obj = { 'a': 'b' };

defineProperty( obj, 'beep', {
    'configurable': true,
    'enumerable': true,
    'writable': false,
    'value': 'boop'
});

var keys = writablePropertyNames( obj );
// returns [ 'a' ]