fs: simplify constant decls

PR-URL: #12644
Reviewed-By: Brian White <[email protected]>

Author: jasnell

lib/internal/fs.js

@@ -4,16 +4,17 @@ const Buffer = require('buffer').Buffer;
 const Writable = require('stream').Writable;
 const fs = require('fs');
 const util = require('util');
-const constants = process.binding('constants').fs;
-
-const O_APPEND = constants.O_APPEND | 0;
-const O_CREAT = constants.O_CREAT | 0;
-const O_EXCL = constants.O_EXCL | 0;
-const O_RDONLY = constants.O_RDONLY | 0;
-const O_RDWR = constants.O_RDWR | 0;
-const O_SYNC = constants.O_SYNC | 0;
-const O_TRUNC = constants.O_TRUNC | 0;
-const O_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;
 
 function assertEncoding(encoding) {
   if (encoding && !Buffer.isEncoding(encoding)) {