test: use ES2017 syntax in test-fs-open-*

Update test-fs-open-flags to take advantage of destructuring and default values. Update test-fs-open-mode-mask to use a ternary to make use of a constant possible. PR-URL: #23031 Reviewed-By: Rich Trott <[email protected]> Reviewed-By: James M Snell <[email protected]>

Author: jy95

test/parallel/test-fs-open-flags.js

@@ -29,15 +29,17 @@ const assert = require('assert');
 constfs=require('fs');
 constpath=require('path');
 
-constO_APPEND=fs.constants.O_APPEND||0;
-constO_CREAT=fs.constants.O_CREAT||0;
-constO_EXCL=fs.constants.O_EXCL||0;
-constO_RDONLY=fs.constants.O_RDONLY||0;
-constO_RDWR=fs.constants.O_RDWR||0;
-constO_SYNC=fs.constants.O_SYNC||0;
-constO_DSYNC=fs.constants.O_DSYNC||0;
-constO_TRUNC=fs.constants.O_TRUNC||0;
-constO_WRONLY=fs.constants.O_WRONLY||0;
+// 0 if not found in fs.constants
+const{O_APPEND=0,
+O_CREAT=0,
+O_EXCL=0,
+O_RDONLY=0,
+O_RDWR=0,
+O_SYNC=0,
+O_DSYNC=0,
+O_TRUNC=0,
+O_WRONLY=0
+}=fs.constants;
 
 const{ stringToFlags }=require('internal/fs/utils');
 

test/parallel/test-fs-open-mode-mask.js

@@ -7,13 +7,7 @@ const assert = require('assert');
 constpath=require('path');
 constfs=require('fs');
 
-letmode;
-
-if(common.isWindows){
-mode=0o444;
-}else{
-mode=0o644;
-}
+constmode=common.isWindows ? 0o444 : 0o644;
 
 constmaskToIgnore=0o10000;