Add eslint and fix reported issues

utils/.eslintrc

@@ -0,0 +1,8 @@
+{
+  "env": {
+    "node": true
+  },
+  "rules": {
+  	"no-console": 0
+  }
+}

utils/genkeysymdef.js

@@ -13,7 +13,8 @@ var fs = require('fs');
 var show_help = process.argv.length === 2;
 var filename;
 
-for (var i = 2; i < process.argv.length; ++i) {
+var i;
+for (i = 2; i < process.argv.length; ++i) {
   switch (process.argv[i]) {
     case "--help":
     case "-h":
@@ -36,19 +37,19 @@ if (show_help) {
   console.log("Usage: node parse.js [options] filename:");
   console.log("  -h [ --help ]                 Produce this help message");
   console.log("  filename                      The keysymdef.h file to parse");
-  return;
+  process.exit(0);
 }
 
 var buf = fs.readFileSync(filename);
 var str = buf.toString('utf8');
 
-var re = /^\#define XK_([a-zA-Z_0-9]+)\s+0x([0-9a-fA-F]+)\s*(\/\*\s*(.*)\s*\*\/)?\s*$/m;
+var re = /^#define XK_([a-zA-Z_0-9]+)\s+0x([0-9a-fA-F]+)\s*(\/\*\s*(.*)\s*\*\/)?\s*$/m;
 
 var arr = str.split('\n');
 
 var codepoints = {};
 
-for (var i = 0; i < arr.length; ++i) {
+for (i = 0; i < arr.length; ++i) {
     var result = re.exec(arr[i]);
     if (result){
         var keyname = result[1];
@@ -84,7 +85,7 @@ function toHex(num) {
         s = ("0000" + s).slice(-4);
     }
     return "0x" + s;
-};
+}
 
 for (var codepoint in codepoints) {
     codepoint = parseInt(codepoint);

utils/use_require.js

@@ -100,7 +100,7 @@ var transform_html = function (legacy_scripts, only_legacy) {
         var start_ind = contents.indexOf(start_marker) + start_marker.length;
         var end_ind = contents.indexOf(end_marker, start_ind);
 
-        new_script = '';
+        var new_script = '';
 
         if (only_legacy) {
             // Only legacy version, so include things directly
@@ -161,11 +161,12 @@ var make_lib_files = function (import_format, source_maps, with_app_dir, only_le
     }
 
     var in_path;
+    var out_path_base;
     if (with_app_dir) {
-        var out_path_base = paths.out_dir_base;
+        out_path_base = paths.out_dir_base;
         in_path = paths.main;
     } else {
-        var out_path_base = paths.lib_dir_base;
+        out_path_base = paths.lib_dir_base;
     }
     const legacy_path_base = only_legacy ? out_path_base : path.join(out_path_base, 'legacy');
 
@@ -223,7 +224,7 @@ var make_lib_files = function (import_format, source_maps, with_app_dir, only_le
             return babelTransformFile(filename, opts)
             .then(res => {
                 console.log(`Writing ${legacy_path}`);
-                var {code, map, ast} = res;
+                var {code, map} = res;
                 if (source_maps === true) {
                     // append URL for external source map
                     code += `\n//# sourceMappingURL=${path.basename(legacy_path)}.map\n`;

utils/use_require_helpers.js

@@ -1,6 +1,5 @@
 // writes helpers require for vnc.html (they should output app.js)
 var fs = require('fs');
-var fse = require('fs-extra');
 var path = require('path');
 
 // util.promisify requires Node.js 8.x, so we have our own