fs: simplify constant decls

PR-URL: #12644
Reviewed-By: Brian White <mscdex@mscdex.net>

Author: jasnell

lib/internal/fs.js

@@ -4,16 +4,17 @@ const Buffer = require('buffer').Buffer;
 constWritable=require('stream').Writable;
 constfs=require('fs');
 constutil=require('util');
-constconstants=process.binding('constants').fs;
-
-constO_APPEND=constants.O_APPEND|0;
-constO_CREAT=constants.O_CREAT|0;
-constO_EXCL=constants.O_EXCL|0;
-constO_RDONLY=constants.O_RDONLY|0;
-constO_RDWR=constants.O_RDWR|0;
-constO_SYNC=constants.O_SYNC|0;
-constO_TRUNC=constants.O_TRUNC|0;
-constO_WRONLY=constants.O_WRONLY|0;
+
+const{
+O_APPEND,
+O_CREAT,
+O_EXCL,
+O_RDONLY,
+O_RDWR,
+O_SYNC,
+O_TRUNC,
+O_WRONLY
+}=process.binding('constants').fs;
 
 functionassertEncoding(encoding){
 if(encoding&&!Buffer.isEncoding(encoding)){