prefer rest and spread

.eslintrc.js

@@ -7,7 +7,6 @@ module.exports = {
     "rules": {
 
         "no-eval": 0,
-        "prefer-rest-params": 0,
 
     },
 

lib/.eslintrc.js

@@ -1,12 +0,0 @@
-"use strict";
-
-module.exports = {
-
-    "rules": {
-
-        "prefer-spread": 0,
-        "strict": 0,
-
-    },
-
-};

lib/ast/visitor.js

@@ -17,7 +17,7 @@ class ASTVisitor {
         // istanbul ignore next
         if ( ! fn ) throw new Error( `Visitor function for node type "${ node.type }" not defined` );
 
-        return fn.apply( this, arguments );
+        return fn.apply( this, arguments ); // eslint-disable-line prefer-rest-params
 
     }
 
@@ -45,14 +45,13 @@ const on = ASTVisitor.on = {
     // Visit a node that is defined as a property on another node
     property( name ) {
 
-        return function visitProperty( node ) {
+        return function visitProperty( node, ...extraArgs ) {
 
-            const extraArgs = __slice.call( arguments, 1 );
             const value = node[ name ];
 
             if ( extraArgs.length )
 
-                this.visit.apply( this, [ value ].concat( extraArgs ) );
+                this.visit( value, ...extraArgs );
 
             else
 
@@ -65,13 +64,12 @@ const on = ASTVisitor.on = {
     // Visit an array of nodes that are defined as a property on another node
     children( name ) {
 
-        return function visitProperty( node ) {
+        return function visitProperty( node, ...extraArgs ) {
 
-            const args = __slice.call( arguments, 0 );
             const children = node[ name ];
             const visitor = this;
 
-            const cb = args.length < 2
+            const cb = extraArgs.length < 1
                 ? function withoutArgs( child ) {
 
                     visitor.visit( child );
@@ -79,8 +77,7 @@ const on = ASTVisitor.on = {
                 }
                 : function withArgs( child ) {
 
-                    args[ 0 ] = child;
+                    visitor.visit( child, ...extraArgs );
-                    visitor.visit.apply( visitor, args );
 
                 };
 
@@ -99,21 +96,17 @@ const visitExpression = on.property( "expression" );
 
 const DEFAULT_FUNCTIONS = {
 
-    grammar( node ) {
+    grammar( node, ...extraArgs ) {
-
-        const args = [ void 0 ].concat( __slice.call( arguments, 1 ) );
 
         if ( node.initializer ) {
 
-            args[ 0 ] = node.initializer;
+            this.visit( node.initializer, ...extraArgs );
-            this.visit.apply( this, args );
 
         }
 
         node.rules.forEach( rule => {
 
-            args[ 0 ] = rule;
+            this.visit( rule, ...extraArgs );
-            this.visit.apply( this, args );
 
         } );
 

lib/compiler/passes/generate-bytecode.js

@@ -244,11 +244,7 @@ function generateBytecode( ast, session ) {
 
     }
 
-    function buildSequence() {
+    const buildSequence = ( ...parts ) => [].concat( ...parts );
-
-        return Array.prototype.concat.apply( [], arguments );
-
-    }
 
     function buildCondition( match, condCode, thenCode, elseCode ) {