[js] Get rid of remaining unused variable warnings

Author: pmurias

.eslintrc.js

@@ -13,7 +13,6 @@ module.exports = {
       "prefer-rest-params": "off",
       "prefer-spread": "off",
       "no-invalid-this": "off",
-      "no-unused-vars": "off",
       "no-var": "off",
       "no-throw-literal": "off"
     }

src/vm/js/nqp-runtime/deserialization.js

@@ -663,7 +663,7 @@ class BinaryCursor {
     // numRepos
     this.int32();
 
-    var paramInternsData = this.int32();
+    this.int32(); // paramInternsData
     var numParamInterns = this.int32();
 
     if (numParamInterns != 0) {

src/vm/js/nqp-runtime/reprs.js

@@ -11,7 +11,8 @@ var core = require('./core.js');
 var nqp = require('nqp-runtime');
 
 var bignum = require('bignum-browserify');
-var ZERO = bignum(0);
+// disable for eval
+var ZERO = bignum(0); // eslint-disable-line no-unused-vars
 
 var constants = require('./constants.js');
 

src/vm/js/nqp-runtime/sixmodel.js

@@ -1,6 +1,10 @@
 'use strict';
 
-var nullStr = require('./null_s.js'); /* Used when evaling runtime compiled methods */
+/* Used when evaling runtime compiled methods */
+const nullStr = require('./null_s.js');  // eslint-disable-line no-unused-vars
+var bignum = require('bignum-browserify');
+const ZERO = bignum(0);  // eslint-disable-line no-unused-vars
+
 var Null = require('./null.js');
 
 var repossession = require('./repossession.js');
@@ -9,8 +13,6 @@ var compilingSCs = repossession.compilingSCs;
 var constants = require('./constants.js');
 
 /* Needed for setting defaults values of attrs for objects */
-var bignum = require('bignum-browserify');
-var ZERO = bignum(0);
 
 /* Needed for throwing exceptions from generated code */
 const NQPException = require('./nqp-exception.js');
@@ -161,7 +163,7 @@ class STable {
         return this.$$elems() ? 1 : 0;
       };
     } else {
-      throw 'setboolspec with mode: ' + mode + ' NYI';
+      throw new NQPException('setboolspec with mode: ' + mode + ' NYI');
     }
   }