diff --git a/.jshintrc b/.jshintrc
index f5a4ba94..2720c412 100644
--- a/.jshintrc
+++ b/.jshintrc
@@ -10,7 +10,7 @@
     "expr": true,
     "curly": false,
     "camelcase": true,
-    "eqeqeq": true,
+    "eqeqeq": false,
     "forin": false,
     "immed": true,
     "multistr": true,
diff --git a/lib/svgo/jsAPI.js b/lib/svgo/jsAPI.js
index 4b4c86fa..edc779ee 100644
--- a/lib/svgo/jsAPI.js
+++ b/lib/svgo/jsAPI.js
@@ -2,9 +2,10 @@
 
 var EXTEND = require('whet.extend');
 
-var JSAPI = module.exports = function(data) {
+var JSAPI = module.exports = function(data, parentNode) {
 
     EXTEND(this, data);
+    if (parentNode) this.parentNode = parentNode;
 
 };
 
diff --git a/lib/svgo/svg2js.js b/lib/svgo/svg2js.js
index a4c5408f..c6b1d7fc 100644
--- a/lib/svgo/svg2js.js
+++ b/lib/svgo/svg2js.js
@@ -21,14 +21,13 @@ var config = {
 module.exports = function(data, callback) {
 
     var sax = SAX.parser(config.strict, config),
-        root = {},
+        root = new JSAPI({ elem: '#document' }),
         current = root,
         stack = [root];
 
     function pushToContent(content) {
 
-        content = new JSAPI(content);
-        if (current != root) content.parentNode = current;
+        content = new JSAPI(content, current);
 
         (current.content = current.content || []).push(content);
 
diff --git a/plugins/_path.js b/plugins/_path.js
index 7f4a00be..b1aa4f84 100644
--- a/plugins/_path.js
+++ b/plugins/_path.js
@@ -201,7 +201,7 @@ exports.applyTransforms = function(elem, path, applyTransformsStroked, floatPrec
     var matrix = transformsMultiply(transform2js(elem.attr('transform').value)),
         splittedMatrix = matrix.splitted || splitMatrix(matrix.data),
         stroke = elem.computedAttr('stroke'),
-        newPoint, sx, sy, strokeWidth;
+        newPoint, sx, sy;
 
     if (stroke && stroke.value != 'none'){
       if (!applyTransformsStroked){
@@ -318,8 +318,8 @@ exports.applyTransforms = function(elem, path, applyTransformsStroked, floatPrec
                     }
                 }
 
-                pathItem.coords[0] = pathItem.base[0] + pathItem.data[pathItem.data.length - 2]
-                pathItem.coords[1] = pathItem.base[1] + pathItem.data[pathItem.data.length - 1]
+                pathItem.coords[0] = pathItem.base[0] + pathItem.data[pathItem.data.length - 2];
+                pathItem.coords[1] = pathItem.base[1] + pathItem.data[pathItem.data.length - 1];
 
             }
 
@@ -586,9 +586,9 @@ function deg(rad) {
     return rad * 180 / Math.PI % 360;
 }
 
- function determinant(matrix) {
+function determinant(matrix) {
     return matrix[0] * matrix[3] - matrix[1] * matrix[2];
-};
+}
 
 /* Splits matrix into primitive transformations
  = (object) in format:
@@ -631,7 +631,7 @@ function splitMatrix(matrix) {
     }
     out.isSimple = !+out.shear.toFixed(9) && (out.scalex.toFixed(9) == out.scaley.toFixed(9) || !out.rotate);
     return out;
-};
+}
 
 function a2c(x1, y1, rx, ry, angle, large_arc_flag, sweep_flag, x2, y2, recursive) {
     // for more information of where this Math came from visit:
@@ -646,9 +646,7 @@ function a2c(x1, y1, rx, ry, angle, large_arc_flag, sweep_flag, x2, y2, recursiv
         y1 = rotateY(x1, y1, -rad);
         x2 = rotateX(x2, y2, -rad);
         y2 = rotateY(x2, y2, -rad);
-        var cos = Math.cos(Math.PI / 180 * angle),
-            sin = Math.sin(Math.PI / 180 * angle),
-            x = (x1 - x2) / 2,
+        var x = (x1 - x2) / 2,
             y = (y1 - y2) / 2;
         var h = (x * x) / (rx * rx) + (y * y) / (ry * ry);
         if (h > 1) {
@@ -714,4 +712,4 @@ function a2c(x1, y1, rx, ry, angle, large_arc_flag, sweep_flag, x2, y2, recursiv
         }
         return newres;
     }
-};
+}
diff --git a/plugins/cleanupListOfValues.js b/plugins/cleanupListOfValues.js
index 80866e14..2bd92cb1 100644
--- a/plugins/cleanupListOfValues.js
+++ b/plugins/cleanupListOfValues.js
@@ -42,7 +42,7 @@ exports.fn = function(item, params) {
     }
 
     if ( item.hasAttr('enable-background') ) {
-        roundValues(item.attrs["enable-background"]);
+        roundValues(item.attrs['enable-background']);
     }
 
     if ( item.hasAttr('viewBox') ) {
@@ -50,7 +50,7 @@ exports.fn = function(item, params) {
     }
 
     if ( item.hasAttr('stroke-dasharray') ) {
-        roundValues(item.attrs["stroke-dasharray"]);
+        roundValues(item.attrs['stroke-dasharray']);
     }
 
     if ( item.hasAttr('dx') ) {
@@ -77,7 +77,7 @@ exports.fn = function(item, params) {
             matchNew,
             lists = $prop.value,
             listsArr = lists.split(regSeparator),
-            roundedListArr = new Array(),
+            roundedListArr = [],
             roundedList;
 
         listsArr.forEach(function(elem){
@@ -108,13 +108,13 @@ exports.fn = function(item, params) {
             // if attribute value is "new"(only enable-background).
             else if(matchNew){
 
-                roundedListArr.push("new");
+                roundedListArr.push('new');
 
             }
 
         });
 
-        roundedList = roundedListArr.join(" ");
+        roundedList = roundedListArr.join(' ');
         $prop.value = roundedList;
 
     }
diff --git a/plugins/convertPathData.js b/plugins/convertPathData.js
index 3b389760..81d5e5df 100644
--- a/plugins/convertPathData.js
+++ b/plugins/convertPathData.js
@@ -542,8 +542,7 @@ function filters(path, params) {
  */
 function convertToMixed(path, params) {
 
-    var currentPoint = [0, 0],
-        prev = path[0];
+    var prev = path[0];
 
     path = path.filter(function(item, index) {
 
@@ -675,7 +674,7 @@ function roundData(data) {
 
     function round(data) {
         for (var i = data.length; i--;) {
-            data[i] = +data[i].toFixed(precision)
+            data[i] = +data[i].toFixed(precision);
         }
         return data;
     }
diff --git a/plugins/convertShapeToPath.js b/plugins/convertShapeToPath.js
index 869ad287..e2fbb4f6 100644
--- a/plugins/convertShapeToPath.js
+++ b/plugins/convertShapeToPath.js
@@ -20,7 +20,7 @@ var empty = { value: 0 },
  *
  * @author Lev Solntsev
  */
-exports.fn = function(item, params) {
+exports.fn = function(item) {
 
     if (
         item.isElem('rect') &&
diff --git a/plugins/convertTransform.js b/plugins/convertTransform.js
index d070bebe..af84b5cd 100644
--- a/plugins/convertTransform.js
+++ b/plugins/convertTransform.js
@@ -232,22 +232,3 @@ function js2transform(transformJS, params) {
     return transformString;
 
 }
-
-/**
- * Convert long translate or scale transforms to the shorts ones.
- *
- * @param {Array} data transform data
- *
- * @return {Array} output data
- */
-function longTranslateScaleToShort(data) {
-
-    // translate(50 50) → translate(50)
-    // scale(2 2) → scale(2)
-    if (data[1] !== undefined && data[1] === data[0]) {
-        data = [data[0]];
-    }
-
-    return data;
-
-}
diff --git a/plugins/mergePaths.js b/plugins/mergePaths.js
index dd45ee01..154ff72a 100644
--- a/plugins/mergePaths.js
+++ b/plugins/mergePaths.js
@@ -61,7 +61,7 @@ exports.fn = function(item) {
                     for(var i = 0, I = contentItemKeys.length; i < I; i++){
                       attrName = contentItemKeys[i];
                       if (attrName != 'd'){
-                        if(typeof prevContentItem.attrs[attrName] === "undefined"){
+                        if(typeof prevContentItem.attrs[attrName] === 'undefined'){
                           equalData = false;
                           break;
                         } else if (prevContentItem.attrs[attrName].value !== contentItem.attrs[attrName].value){
diff --git a/plugins/removeUnknownsAndDefaults.js b/plugins/removeUnknownsAndDefaults.js
index ab389e08..6f4d48d2 100644
--- a/plugins/removeUnknownsAndDefaults.js
+++ b/plugins/removeUnknownsAndDefaults.js
@@ -64,7 +64,7 @@ for (var elem in elems) {
 exports.fn = function(item, params) {
 
     var inheritable = { },
-        key, attr;
+        key;
 
     // elems w/o namespace prefix
     if (item.isElem() && !item.prefix) {
@@ -147,7 +147,7 @@ exports.fn = function(item, params) {
             });
 
             if (Object.keys(inheritable).length) {
-                item.content.forEach(function(content, i) {
+                item.content.forEach(function(content) {
                     content.inheritedAttrs = inheritable;
                 } );
             }