tty: refactor exports

This commit moves the tty module's exports to a single object, which is more aligned with other core modules. PR-URL: #16959 Reviewed-By: Gireesh Punathil <[email protected]> Reviewed-By: James M Snell <[email protected]> Reviewed-By: Anna Henningsen <[email protected]>

Author: cjihrig

lib/tty.js

@@ -29,9 +29,9 @@ const errnoException = util._errnoException;
 consterrors=require('internal/errors');
 constreadline=require('readline');
 
-exports.isatty=function(fd){
+functionisatty(fd){
 returnNumber.isInteger(fd)&&fd>=0&&isTTY(fd);
-};
+}
 
 
 functionReadStream(fd,options){
@@ -54,8 +54,6 @@ function ReadStream(fd, options){
 }
 inherits(ReadStream,net.Socket);
 
-exports.ReadStream=ReadStream;
-
 ReadStream.prototype.setRawMode=function(flag){
 flag=!!flag;
 this._handle.setRawMode(flag);
@@ -90,7 +88,6 @@ function WriteStream(fd){
 }
 }
 inherits(WriteStream,net.Socket);
-exports.WriteStream=WriteStream;
 
 
 WriteStream.prototype.isTTY=true;
@@ -131,3 +128,6 @@ WriteStream.prototype.clearScreenDown = function(){
 WriteStream.prototype.getWindowSize=function(){
 return[this.columns,this.rows];
 };
+
+
+module.exports={ isatty, ReadStream, WriteStream };