diff --git a/.eslintrc.json b/.eslintrc.json
new file mode 100644
index 0000000..f534d74
--- /dev/null
+++ b/.eslintrc.json
@@ -0,0 +1,218 @@
+{
+  "env": {
+    "browser": true,
+    "commonjs": true
+  },
+  "extends": "eslint:recommended",
+  "parserOptions": {
+    "ecmaVersion": 5
+  },
+  "rules": {
+    "accessor-pairs": "error",
+    "array-bracket-spacing": [ "error", "always" ],
+    "array-callback-return": "error",
+    "array-element-newline": "off",
+    "arrow-body-style": [ "error", "always" ],
+    "arrow-parens": [ "error", "always" ],
+    "arrow-spacing": "error",
+    "block-scoped-var": "error",
+    "block-spacing": "error",
+    "brace-style": [ "error", "1tbs" ],
+    "camelcase": "error",
+    "class-methods-use-this": "error",
+    "comma-dangle": [ "error", "always-multiline" ],
+    "comma-spacing": "error",
+    "comma-style": [ "error", "last" ],
+    "complexity": [ "error", 12 ],
+    "consistent-this": [ "error", "_this" ],
+    "curly": "error",
+    "default-case": "error",
+    "dot-location": [ "error", "property" ],
+    "dot-notation": "error",
+    "eol-last": "error",
+    "eqeqeq": "off",
+    "func-call-spacing": "error",
+    "func-name-matching": "error",
+    "func-style": [ "error", "declaration" ],
+    "function-paren-newline": [ "error", "consistent" ],
+    "generator-star-spacing": "error",
+    "id-blacklist": [ "error", "data", "callback" ],
+    "id-length": [ "error", {
+      "min": 3,
+      "max": 30,
+      "exceptions": [ "x", "y", "z", "i", "a", "b" ]
+    }],
+    "id-match": "error",
+    "implicit-arrow-linebreak": "error",
+    "indent": [ "error", 2, {
+      "VariableDeclarator": 4,
+      "CallExpression": { "arguments": 2 },
+      "FunctionExpression": { "body": 1, "parameters": 2 },
+      "ignoredNodes": [ "CallExpression > FunctionExpression > BlockStatement.body" ]
+    }],
+    "key-spacing": "error",
+    "keyword-spacing": [ "error", {
+      "before": true,
+      "after": true
+    }],
+    "linebreak-style": [ "error", "unix" ],
+    "lines-around-comment": "error",
+    "lines-between-class-members": "error",
+    "max-classes-per-file": "error",
+    "max-depth": "error",
+    "max-len": [ "error", {
+      "code": 80
+    }],
+    "max-lines": [ "error", {
+      "max": 300
+    }],
+    "max-nested-callbacks": "error",
+    "max-statements-per-line": "error",
+    "new-cap": "error",
+    "new-parens": "error",
+    "newline-per-chained-call": "error",
+    "no-alert": "error",
+    "no-array-constructor": "error",
+    "no-async-promise-executor": "error",
+    "no-await-in-loop": "error",
+    "no-bitwise": "error",
+    "no-buffer-constructor": "error",
+    "no-caller": "error",
+    "no-catch-shadow": "error",
+    "no-confusing-arrow": "error",
+    "no-continue": "error",
+    "no-div-regex": "error",
+    "no-duplicate-imports": "error",
+    "no-eq-null": "error",
+    "no-eval": "error",
+    "no-extend-native": "error",
+    "no-extra-bind": "error",
+    "no-extra-label": "error",
+    "no-extra-parens": [ "error", "all", {
+      "nestedBinaryExpressions": false
+    }],
+    "no-floating-decimal": "error",
+    "no-implicit-globals": "error",
+    "no-implied-eval": "error",
+    "no-inner-declarations": [ "error", "functions" ],
+    "no-invalid-this": "error",
+    "no-iterator": "error",
+    "no-label-var": "error",
+    "no-labels": "error",
+    "no-lone-blocks": "error",
+    "no-lonely-if": "error",
+    "no-loop-func": "error",
+    "no-magic-numbers": "off",
+    "no-misleading-character-class": "error",
+    "no-mixed-requires": "error",
+    "no-multi-assign": "off",
+    "no-multi-spaces": [ "error", {
+      "exceptions": { "Property": true }
+    }],
+    "no-multi-str": "error",
+    "no-multiple-empty-lines": "error",
+    "no-native-reassign": "error",
+    "no-negated-condition": "off",
+    "no-negated-in-lhs": "error",
+    "no-nested-ternary": "error",
+    "no-new-func": "error",
+    "no-new-object": "error",
+    "no-new-require": "error",
+    "no-new-wrappers": "error",
+    "no-octal-escape": "error",
+    "no-param-reassign": "off",
+    "no-path-concat": "error",
+    "no-process-env": "error",
+    "no-process-exit": "error",
+    "no-proto": "error",
+    "no-prototype-builtins": "error",
+    "no-restricted-globals": "error",
+    "no-restricted-imports": "error",
+    "no-restricted-modules": "error",
+    "no-restricted-properties": "error",
+    "no-restricted-syntax": "error",
+    "no-return-assign": "error",
+    "no-return-await": "error",
+    "no-script-url": "error",
+    "no-self-compare": "error",
+    "no-sequences": "error",
+    "no-shadow": "error",
+    "no-shadow-restricted-names": "error",
+    "no-spaced-func": "error",
+    "no-tabs": "error",
+    "no-template-curly-in-string": "error",
+    "no-ternary": "off",
+    "no-throw-literal": "error",
+    "no-trailing-spaces": "error",
+    "no-undef-init": "error",
+    "no-undefined": "off",
+    "no-underscore-dangle": "off",
+    "no-unmodified-loop-condition": "error",
+    "no-unneeded-ternary": "error",
+    "no-unused-expressions": "error",
+    "no-use-before-define": [ "error", {
+      "functions": false
+    }],
+    "no-useless-call": "error",
+    "no-useless-catch": "error",
+    "no-useless-computed-key": "error",
+    "no-useless-concat": "error",
+    "no-useless-constructor": "error",
+    "no-useless-rename": "error",
+    "no-useless-return": "error",
+    "no-var": "off",
+    "no-void": "error",
+    "no-warning-comments": "off",
+    "no-whitespace-before-property": "error",
+    "no-with": "error",
+    "nonblock-statement-body-position": "error",
+    "object-curly-newline": "error",
+    "one-var": [ "error", {
+      "initialized": "never",
+      "uninitialized": "always"
+    }],
+    "one-var-declaration-per-line": [ "error", "initializations" ],
+    "operator-assignment": "error",
+    "operator-linebreak": [ "error", "after" ],
+    "padded-blocks": "off",
+    "padding-line-between-statements": "error",
+    "prefer-arrow-callback": "off",
+    "prefer-numeric-literals": "error",
+    "prefer-object-spread": "error",
+    "prefer-promise-reject-errors": "error",
+    "prefer-spread": "error",
+    "quote-props": [ "error", "as-needed" ],
+    "quotes": [ "error", "single", {
+      "avoidEscape": true
+    }],
+    "radix": "error",
+    "require-atomic-updates": "error",
+    "require-await": "error",
+    "rest-spread-spacing": "error",
+    "semi": "error",
+    "semi-spacing": [ "error", {
+      "after": true,
+      "before": false
+    }],
+    "semi-style": [ "error", "last" ],
+    "sort-imports": "error",
+    "space-before-blocks": "error",
+    "space-before-function-paren": [ "error", "never" ],
+    "space-in-parens": "off",
+    "space-infix-ops": "off",
+    "space-unary-ops": "error",
+    "spaced-comment": "off",
+    "strict": [ "error", "never" ],
+    "switch-colon-spacing": "error",
+    "symbol-description": "error",
+    "template-curly-spacing": "error",
+    "template-tag-spacing": "error",
+    "unicode-bom": [ "error", "never" ],
+    "valid-jsdoc": "error",
+    "vars-on-top": "off",
+    "wrap-iife": [ "error", "any" ],
+    "wrap-regex": "error",
+    "yield-star-spacing": "error",
+    "yoda": [ "error", "never" ]
+  }
+}
diff --git a/Makefile b/Makefile
index 101943b..dc4c944 100644
--- a/Makefile
+++ b/Makefile
@@ -5,7 +5,7 @@ uglify:
 	npx uglifyjs dist/zdog.dist.js -o dist/zdog.dist.min.js --mangle --comments /^!/
 
 lint:
-	npx jshint js/*.js demos/**/*.js tasks/*.js
+	npx eslint js/ demos/ tasks/
 
 dist: bundle uglify
 
diff --git a/demos/.eslintrc.json b/demos/.eslintrc.json
new file mode 100644
index 0000000..fbfa821
--- /dev/null
+++ b/demos/.eslintrc.json
@@ -0,0 +1,14 @@
+{
+  "extends": "../.eslintrc.json",
+  "globals": {
+    "Zdog": "readonly"
+  },
+  "rules": {
+    "key-spacing": "off",
+    "max-lines": "off",
+    "one-var": [ "error", {
+      "initialized": "never",
+      "uninitialized": "consecutive"
+    }]
+  }
+}
diff --git a/demos/.jshintrc b/demos/.jshintrc
deleted file mode 100644
index 1856602..0000000
--- a/demos/.jshintrc
+++ /dev/null
@@ -1,8 +0,0 @@
-{
-  "browser": true,
-  "unused": true,
-  "undef": true,
-  "globals": {
-    "Zdog": false
-  }
-}
diff --git a/demos/box-cross/box-cross.js b/demos/box-cross/box-cross.js
index f20f854..b4275ae 100644
--- a/demos/box-cross/box-cross.js
+++ b/demos/box-cross/box-cross.js
@@ -123,7 +123,7 @@ function spin() {
   var progress = ticker / cycleCount;
   var turn = Math.floor( progress % 4 );
   var theta = Zdog.easeInOut( progress % 1, 3 ) * TAU;
-  if ( turn == 0  || turn == 2 ) {
+  if ( turn == 0 || turn == 2 ) {
     model.rotate.y = theta;
   } else if ( turn == 1 ) {
     model.rotate.x = theta;
diff --git a/demos/hemisphere-cone-ball/hemisphere-cone-ball.js b/demos/hemisphere-cone-ball/hemisphere-cone-ball.js
index 5ee19ee..ba3216d 100644
--- a/demos/hemisphere-cone-ball/hemisphere-cone-ball.js
+++ b/demos/hemisphere-cone-ball/hemisphere-cone-ball.js
@@ -45,7 +45,7 @@ var cone = new Zdog.Cone({
   stroke: false,
 });
 
-var colorWheel = [ eggplant, garnet, orange, gold, yellow, ];
+var colorWheel = [ eggplant, garnet, orange, gold, yellow ];
 
 [ true, false ].forEach( function( isHemi ) {
   var shape = isHemi ? hemi : cone;
@@ -71,9 +71,9 @@ var colorWheel = [ eggplant, garnet, orange, gold, yellow, ];
 // ----- animate ----- //
 
 var keyframes = [
-  { x: TAU * 0,   y: TAU * 0 },
-  { x: TAU * 1/2, y: TAU * 1/2 },
-  { x: TAU * 1,   y: TAU * 1 },
+  { x: TAU*0, y: TAU*0 },
+  { x: TAU/2, y: TAU/2 },
+  { x: TAU*1, y: TAU*1 },
 ];
 
 var ticker = 0;
@@ -97,7 +97,7 @@ function spin() {
   var keyB = keyframes[ turn + 1 ];
   var thetaX = Zdog.lerp( keyA.x, keyB.x, tween );
   illo.rotate.x = Math.cos( thetaX ) * TAU/12;
-  illo.rotate.y = Zdog.lerp( keyA.y, keyB.y, tween ) ;
+  illo.rotate.y = Zdog.lerp( keyA.y, keyB.y, tween );
   ticker++;
 }
 
diff --git a/demos/houses/houses.js b/demos/houses/houses.js
index 76f0364..4243569 100644
--- a/demos/houses/houses.js
+++ b/demos/houses/houses.js
@@ -84,7 +84,7 @@ new Zdog.Shape({
       { x: 2, y: -3 },
       { x: 2, y: -1 },
     ]},
-    { x: 2, y: 3 }
+    { x: 2, y: 3 },
   ],
   translate: { x: 2, y: 4 },
   color: eggplant,
diff --git a/demos/kid-kit/kid-kit.js b/demos/kid-kit/kid-kit.js
index 3c574eb..3abd61e 100644
--- a/demos/kid-kit/kid-kit.js
+++ b/demos/kid-kit/kid-kit.js
@@ -127,7 +127,7 @@ new Zdog.Shape({
 var innerEarXShift = 4;
 new Zdog.Shape({
   path: [
-    { x: earA.x - innerEarXShift , y: earA.y-3 },
+    { x: earA.x - innerEarXShift, y: earA.y-3 },
     { x: earD.x, y: earD.y+5 },
     { x: earE.x + innerEarXShift, y: earE.y+2 },
   ],
@@ -242,7 +242,7 @@ var cloakSide = new Zdog.Anchor({
 });
 
 // top straps
-var topCloakStrap =   new Zdog.Shape({
+var topCloakStrap = new Zdog.Shape({
   path: [
     { x: cloakX0, y: cloakY0, z: cloakZ0 },
     { x: cloakX0, y: cloakY1, z: cloakZ1 },
diff --git a/demos/kirby-parasol/kirby-parasol.js b/demos/kirby-parasol/kirby-parasol.js
index d3f50de..2e82383 100644
--- a/demos/kirby-parasol/kirby-parasol.js
+++ b/demos/kirby-parasol/kirby-parasol.js
@@ -165,7 +165,7 @@ var rightFoot = new Zdog.Shape({
 
 rightFoot.copy({
   translate: { x: 9.5, y: 6, z: -6 },
-  rotate: { z: -1.1, y: 0.8 }
+  rotate: { z: -1.1, y: 0.8 },
 });
 
 // ----- umbrella ----- //
diff --git a/demos/shade-and-shades/shade-and-shades.js b/demos/shade-and-shades/shade-and-shades.js
index c7faa6e..47830a8 100644
--- a/demos/shade-and-shades/shade-and-shades.js
+++ b/demos/shade-and-shades/shade-and-shades.js
@@ -102,12 +102,12 @@ var brimBridge = new Zdog.Shape({
     { bezier: [
       { x: -16, y: 4, z: 30 },
       brimEdge,
-      brimTip
+      brimTip,
     ]},
   ],
 });
 brimBridge.copy({
-  scale: { x: - 1},
+  scale: { x: -1},
 });
 
 // glasses front top
@@ -115,7 +115,7 @@ var glassFront = new Zdog.Shape({
   addTo: illo,
   path: [
     { x: -16 },
-    { x:  16 }
+    { x:  16 },
   ],
   translate: { y: 8, z: 12 },
   color: eggplant,
diff --git a/demos/shapes/shapes.js b/demos/shapes/shapes.js
index ad68d5c..cfe5a59 100644
--- a/demos/shapes/shapes.js
+++ b/demos/shapes/shapes.js
@@ -67,7 +67,7 @@ new Zdog.Shape({
     { move: { y: -1 } },
     { y: 1 },
     { move: { z: -1 } },
-    { z: 1 }
+    { z: 1 },
   ],
   scale: 1.25,
   stroke: 1,
diff --git a/demos/solids/solids.js b/demos/solids/solids.js
index 5cf2338..b23efc7 100644
--- a/demos/solids/solids.js
+++ b/demos/solids/solids.js
@@ -156,7 +156,7 @@ new Zdog.Cone({
     var rotor2 = new Zdog.Anchor({
       addTo: rotor1,
       translate: { z: inradius, y: height/2 },
-      rotate: { x: Math.acos(1/3) * -1 + TAU/4  },
+      rotate: { x: Math.acos(1/3) * -1 + TAU/4 },
     });
     triangle.copy({
       addTo: rotor2,
@@ -284,7 +284,7 @@ solids.push( cube );
     for ( var i=0; i < 5; i++ ) {
       var rotor1 = new Zdog.Anchor({
         addTo: dodecahedron,
-        rotate: { y: TAU/5 * (i) },
+        rotate: { y: TAU/5 * i },
       });
       var rotor2 = new Zdog.Anchor({
         addTo: rotor1,
@@ -377,7 +377,7 @@ solids.push( cube );
         addTo: sideAnchor,
         translate: { y: -faceRadius/2 },
         rotate: { y: TAU/2 },
-        color: sideColors[i]
+        color: sideColors[i],
       });
 
     }
diff --git a/demos/strutter/strutter.js b/demos/strutter/strutter.js
index 95a04d3..0eb58cb 100644
--- a/demos/strutter/strutter.js
+++ b/demos/strutter/strutter.js
@@ -86,7 +86,7 @@ var armSize = 6;
     path: [ { x: 0 }, { x: armSize } ],
     scale: { x: xSide },
     translate: { x: 4.5 * xSide, y: -8, z: -4 },
-    rotate: isRight ? { y: TAU/8, z: -TAU/16 } : { y: TAU/8  },
+    rotate: isRight ? { y: TAU/8, z: -TAU/16 } : { y: TAU/8 },
     color: eggplant,
     stroke: 4,
   });
@@ -95,7 +95,8 @@ var armSize = 6;
     addTo: upperArm,
     path: [ { x: 0 }, { x: armSize-2 } ],
     translate: { x: armSize },
-    rotate: isRight ? { z: TAU/16 * 3, y: TAU/4 } : { z: -TAU/4, x: -TAU/32 * 2, y: TAU/8 },
+    rotate: isRight ? { z: TAU/16 * 3, y: TAU/4 } :
+      { z: -TAU/4, x: -TAU/32 * 2, y: TAU/8 },
     color: orange,
     stroke: 4,
   });
diff --git a/demos/zdog-logo/zdog-logo.js b/demos/zdog-logo/zdog-logo.js
index 639a10f..a84ca41 100644
--- a/demos/zdog-logo/zdog-logo.js
+++ b/demos/zdog-logo/zdog-logo.js
@@ -63,7 +63,7 @@ var endCap = new Zdog.Rect({
   backface: false,
 });
 endCap.copy({
-  translate: { x: 20,  y: 16 },
+  translate: { x: 20, y: 16 },
   rotate: { y: -TAU/4 },
 });
 
@@ -129,13 +129,13 @@ new Zdog.Ellipse({
 var tongueAnchor = new Zdog.Anchor({
   addTo: backGroup,
   translate: { x: -6, y: -7 },
-  rotate: {  y: TAU/4  },
+  rotate: { y: TAU/4 },
 
 });
 
 var tongueH = 12;
 var tongueS = 5;
-var tongueTip  = tongueH + tongueS;
+var tongueTip = tongueH + tongueS;
 
 new Zdog.Shape({
   addTo: tongueAnchor,
@@ -145,11 +145,11 @@ new Zdog.Shape({
     { x:  tongueS, y: tongueH },
     { arc: [
       { x: tongueS, y: tongueTip },
-      { x: 0, y: tongueTip }
+      { x: 0, y: tongueTip },
     ]},
     { arc: [
       { x: -tongueS, y: tongueTip },
-      { x: -tongueS, y: tongueH }
+      { x: -tongueS, y: tongueH },
     ]},
   ],
   rotate: { x: TAU/4 - Math.atan(16/22) },
diff --git a/js/.jshintrc b/js/.jshintrc
deleted file mode 100644
index fee5bd1..0000000
--- a/js/.jshintrc
+++ /dev/null
@@ -1,5 +0,0 @@
-{
-  "browser": true,
-  "unused": true,
-  "undef": true
-}
diff --git a/js/anchor.js b/js/anchor.js
index 2194d5e..937c693 100644
--- a/js/anchor.js
+++ b/js/anchor.js
@@ -5,9 +5,9 @@
 ( function( root, factory ) {
   // module definition
   if ( typeof module == 'object' && module.exports ) {
-    /* globals module, require */ // CommonJS
+    // CommonJS
     module.exports = factory( require('./boilerplate'), require('./vector'),
-       require('./canvas-renderer'), require('./svg-renderer') );
+        require('./canvas-renderer'), require('./svg-renderer') );
   } else {
     // browser global
     var Zdog = root.Zdog;
diff --git a/js/boilerplate.js b/js/boilerplate.js
index 875f450..0e894ec 100644
--- a/js/boilerplate.js
+++ b/js/boilerplate.js
@@ -13,7 +13,7 @@
 ( function( root, factory ) {
   // module definition
   if ( typeof module == 'object' && module.exports ) {
-    /* globals module */ // CommonJS
+    // CommonJS
     module.exports = factory();
   } else {
     // browser global
@@ -32,8 +32,8 @@ Zdog.extend = function( a, b ) {
   return a;
 };
 
-Zdog.lerp = function( a, b, t ) {
-  return ( b - a ) * t + a;
+Zdog.lerp = function( a, b, alpha ) {
+  return ( b - a ) * alpha + a;
 };
 
 Zdog.modulo = function( num, div ) {
@@ -52,7 +52,7 @@ var powerMultipliers = {
   },
   5: function( a ) {
     return a * a * a * a * a;
-  }
+  },
 };
 
 Zdog.easeInOut = function( alpha, power ) {
@@ -62,11 +62,11 @@ Zdog.easeInOut = function( alpha, power ) {
   alpha = Math.max( 0, Math.min( 1, alpha ) );
   var isFirstHalf = alpha < 0.5;
   var slope = isFirstHalf ? alpha : 1 - alpha;
-  slope = slope / 0.5;
+  slope /= 0.5;
   // make easing steeper with more multiples
   var powerMultiplier = powerMultipliers[ power ] || powerMultipliers[2];
   var curve = powerMultiplier( slope );
-  curve = curve / 2;
+  curve /= 2;
   return isFirstHalf ? curve : 1 - curve;
 };
 
diff --git a/js/box.js b/js/box.js
index 5947ff1..4f8735f 100644
--- a/js/box.js
+++ b/js/box.js
@@ -5,7 +5,7 @@
 ( function( root, factory ) {
   // module definition
   if ( typeof module == 'object' && module.exports ) {
-    /* globals module, require */ // CommonJS
+    // CommonJS
     module.exports = factory( require('./boilerplate'), require('./anchor'),
         require('./shape'), require('./rect') );
   } else {
diff --git a/js/canvas-renderer.js b/js/canvas-renderer.js
index 588362a..d7183cb 100644
--- a/js/canvas-renderer.js
+++ b/js/canvas-renderer.js
@@ -5,7 +5,7 @@
 ( function( root, factory ) {
   // module definition
   if ( typeof module == 'object' && module.exports ) {
-    /* globals module */ // CommonJS
+    // CommonJS
     module.exports = factory();
   } else {
     // browser global
diff --git a/js/cone.js b/js/cone.js
index 1c93bca..4535e5a 100644
--- a/js/cone.js
+++ b/js/cone.js
@@ -5,7 +5,7 @@
 ( function( root, factory ) {
   // module definition
   if ( typeof module == 'object' && module.exports ) {
-    /* globals module, require */ // CommonJS
+    // CommonJS
     module.exports = factory( require('./boilerplate'), require('./vector'),
         require('./path-command'), require('./anchor'), require('./ellipse') );
   } else {
@@ -69,7 +69,8 @@ Cone.prototype.renderConeSurface = function( ctx, renderer ) {
     return;
   }
   // update tangents
-  var apexAngle = Math.atan2( this.renderNormal.y, this.renderNormal.x ) + TAU/2;
+  var apexAngle = Math.atan2( this.renderNormal.y, this.renderNormal.x ) +
+      TAU/2;
   var projectLength = apexDistance / eccen;
   var projectAngle = Math.acos( radius / projectLength );
   // set tangent points
diff --git a/js/cylinder.js b/js/cylinder.js
index 58b7a5c..cc2a4f0 100644
--- a/js/cylinder.js
+++ b/js/cylinder.js
@@ -5,7 +5,7 @@
 ( function( root, factory ) {
   // module definition
   if ( typeof module == 'object' && module.exports ) {
-    /* globals module, require */ // CommonJS
+    // CommonJS
     module.exports = factory( require('./boilerplate'),
         require('./path-command'), require('./shape'), require('./group'),
         require('./ellipse') );
@@ -20,7 +20,7 @@
 function noop() {}
 
 // ----- CylinderGroup ----- //
-  
+
 var CylinderGroup = Group.subclass({
   color: '#333',
   updateSort: true,
diff --git a/js/dragger.js b/js/dragger.js
index b645d28..9b21035 100644
--- a/js/dragger.js
+++ b/js/dragger.js
@@ -5,7 +5,7 @@
 ( function( root, factory ) {
   // module definition
   if ( typeof module == 'object' && module.exports ) {
-    /* globals module */ // CommonJS
+    // CommonJS
     module.exports = factory( root );
   } else {
     // browser global
@@ -49,7 +49,7 @@ Dragger.prototype.create = function( options ) {
 Dragger.prototype.bindDrag = function( element ) {
   element = this.getQueryElement( element );
   if ( element ) {
-    element.addEventListener( downEvent , this );
+    element.addEventListener( downEvent, this );
   }
 };
 
diff --git a/js/ellipse.js b/js/ellipse.js
index bd567d5..fafbe98 100644
--- a/js/ellipse.js
+++ b/js/ellipse.js
@@ -5,7 +5,7 @@
 ( function( root, factory ) {
   // module definition
   if ( typeof module == 'object' && module.exports ) {
-    /* globals module, require */ // CommonJS
+    // CommonJS
     module.exports = factory( require('./shape') );
   } else {
     // browser global
@@ -33,7 +33,7 @@ Ellipse.prototype.setPath = function() {
     { arc: [ // top right
       { x: x, y: -y },
       { x: x, y: 0 },
-    ]}
+    ]},
   ];
   // bottom right
   if ( this.quarters > 1 ) {
diff --git a/js/group.js b/js/group.js
index b3121de..ffafb84 100644
--- a/js/group.js
+++ b/js/group.js
@@ -5,7 +5,7 @@
 ( function( root, factory ) {
   // module definition
   if ( typeof module == 'object' && module.exports ) {
-    /* globals module, require */ // CommonJS
+    // CommonJS
     module.exports = factory( require('./anchor') );
   } else {
     // browser global
@@ -52,7 +52,7 @@ Group.prototype.render = function( ctx, renderer ) {
 Group.prototype.updateFlatGraph = function() {
   // do not include self
   var flatGraph = [];
-  this.flatGraph = this.addChildFlatGraph( flatGraph ); 
+  this.flatGraph = this.addChildFlatGraph( flatGraph );
 };
 
 // do not include children, group handles rendering & sorting internally
diff --git a/js/hemisphere.js b/js/hemisphere.js
index ed28839..fa92c4e 100644
--- a/js/hemisphere.js
+++ b/js/hemisphere.js
@@ -5,7 +5,7 @@
 ( function( root, factory ) {
   // module definition
   if ( typeof module == 'object' && module.exports ) {
-    /* globals module, require */ // CommonJS
+    // CommonJS
     module.exports = factory( require('./boilerplate'), require('./ellipse') );
   } else {
     // browser global
@@ -45,10 +45,10 @@ Hemisphere.prototype.renderDome = function( ctx, renderer ) {
   } else if ( renderer.isSvg ) {
     // svg
     contourAngle = (contourAngle - TAU/4) / TAU * 360;
-    this.domeSvgElement.setAttribute( 'd', 'M ' + (-domeRadius) + ',0 A ' +
-      domeRadius + ',' + domeRadius + ' 0 0 1 ' + domeRadius  + ',0' );
+    this.domeSvgElement.setAttribute( 'd', 'M ' + -domeRadius + ',0 A ' +
+        domeRadius + ',' + domeRadius + ' 0 0 1 ' + domeRadius + ',0' );
     this.domeSvgElement.setAttribute( 'transform',
-      'translate(' + x + ',' + y + ' ) rotate(' + contourAngle + ')' );
+        'translate(' + x + ',' + y + ' ) rotate(' + contourAngle + ')' );
   }
 
   renderer.stroke( ctx, elem, this.stroke, this.color, this.getLineWidth() );
diff --git a/js/illustration.js b/js/illustration.js
index f0b099d..79d842f 100644
--- a/js/illustration.js
+++ b/js/illustration.js
@@ -5,7 +5,7 @@
 ( function( root, factory ) {
   // module definition
   if ( typeof module == 'object' && module.exports ) {
-    /* globals module, require */ // CommonJS
+    // CommonJS
     module.exports = factory( require('./boilerplate'), require('./anchor'),
         require('./dragger') );
   } else {
@@ -48,7 +48,7 @@ Illustration.prototype.setElement = function( element ) {
   }
 
   var nodeName = element.nodeName.toLowerCase();
-  if ( nodeName == 'canvas'  ) {
+  if ( nodeName == 'canvas' ) {
     this.setCanvas( element );
   } else if ( nodeName == 'svg' ) {
     this.setSvg( element );
@@ -163,7 +163,7 @@ Illustration.prototype.prerenderCanvas = function() {
   this.onPrerender( ctx );
 };
 
-Illustration.prototype.postrenderCanvas = function () {
+Illustration.prototype.postrenderCanvas = function() {
   this.ctx.restore();
 };
 
@@ -217,6 +217,7 @@ Illustration.prototype.setDragRotate = function( item ) {
   if ( !item ) {
     return;
   } else if ( item === true ) {
+    /* eslint consistent-this: "off" */
     item = this;
   }
   this.dragRotate = item;
diff --git a/js/index.js b/js/index.js
index 6801475..e55d250 100644
--- a/js/index.js
+++ b/js/index.js
@@ -5,26 +5,26 @@
 ( function( root, factory ) {
   // module definition
   if ( typeof module == 'object' && module.exports ) {
-    /* globals module, require */ // CommonJS
+    // CommonJS
     module.exports = factory(
-      require('./boilerplate'),
-      require('./canvas-renderer'),
-      require('./svg-renderer'),
-      require('./vector'),
-      require('./anchor'),
-      require('./dragger'),
-      require('./illustration'),
-      require('./path-command'),
-      require('./shape'),
-      require('./group'),
-      require('./rect'),
-      require('./rounded-rect'),
-      require('./ellipse'),
-      require('./polygon'),
-      require('./hemisphere'),
-      require('./cylinder'),
-      require('./cone'),
-      require('./box')
+        require('./boilerplate'),
+        require('./canvas-renderer'),
+        require('./svg-renderer'),
+        require('./vector'),
+        require('./anchor'),
+        require('./dragger'),
+        require('./illustration'),
+        require('./path-command'),
+        require('./shape'),
+        require('./group'),
+        require('./rect'),
+        require('./rounded-rect'),
+        require('./ellipse'),
+        require('./polygon'),
+        require('./hemisphere'),
+        require('./cylinder'),
+        require('./cone'),
+        require('./box')
     );
   } else if ( typeof define == 'function' && define.amd ) {
     /* globals define */ // AMD
@@ -53,5 +53,4 @@
       Zdog.Box = Box;
 
       return Zdog;
-    }
-);
+});
diff --git a/js/path-command.js b/js/path-command.js
index 5867b1e..3a56d34 100644
--- a/js/path-command.js
+++ b/js/path-command.js
@@ -5,7 +5,7 @@
 ( function( root, factory ) {
   // module definition
   if ( typeof module == 'object' && module.exports ) {
-    /* globals module, require */ // CommonJS
+    // CommonJS
     module.exports = factory( require('./vector') );
   } else {
     // browser global
@@ -73,14 +73,16 @@ PathCommand.prototype.bezier = function( ctx, elem, renderer ) {
   return renderer.bezier( ctx, elem, cp0, cp1, end );
 };
 
+var arcHandleLength = 9/16;
+
 PathCommand.prototype.arc = function( ctx, elem, renderer ) {
   var prev = this.previousPoint;
   var corner = this.renderPoints[0];
   var end = this.renderPoints[1];
   var cp0 = this.controlPoints[0];
   var cp1 = this.controlPoints[1];
-  cp0.set( prev ).lerp( corner, 9/16 );
-  cp1.set( end ).lerp( corner, 9/16 );
+  cp0.set( prev ).lerp( corner, arcHandleLength );
+  cp1.set( end ).lerp( corner, arcHandleLength );
   return renderer.bezier( ctx, elem, cp0, cp1, end );
 };
 
diff --git a/js/polygon.js b/js/polygon.js
index 2f5813f..a3ea770 100644
--- a/js/polygon.js
+++ b/js/polygon.js
@@ -5,7 +5,7 @@
 ( function( root, factory ) {
   // module definition
   if ( typeof module == 'object' && module.exports ) {
-    /* globals module, require */ // CommonJS
+    // CommonJS
     module.exports = factory( require('./boilerplate'), require('./shape') );
   } else {
     // browser global
diff --git a/js/rect.js b/js/rect.js
index 239a43d..9e69542 100644
--- a/js/rect.js
+++ b/js/rect.js
@@ -5,7 +5,7 @@
 ( function( root, factory ) {
   // module definition
   if ( typeof module == 'object' && module.exports ) {
-    /* globals module, require */// CommonJS
+    // CommonJS
     module.exports = factory( require('./shape') );
   } else {
     // browser global
@@ -22,6 +22,7 @@ var Rect = Shape.subclass({
 Rect.prototype.setPath = function() {
   var x = this.width / 2;
   var y = this.height / 2;
+  /* eslint key-spacing: "off" */
   this.path = [
     { x: -x, y: -y },
     { x:  x, y: -y },
diff --git a/js/rounded-rect.js b/js/rounded-rect.js
index 3f4f6fa..30c8a3f 100644
--- a/js/rounded-rect.js
+++ b/js/rounded-rect.js
@@ -5,7 +5,7 @@
 ( function( root, factory ) {
   // module definition
   if ( typeof module == 'object' && module.exports ) {
-    /* globals module, require */ // CommonJS
+    // CommonJS
     module.exports = factory( require('./shape') );
   } else {
     // browser global
@@ -22,6 +22,9 @@ var RoundedRect = Shape.subclass({
 });
 
 RoundedRect.prototype.setPath = function() {
+  /* eslint
+     id-length: [ "error", { "min": 2, "exceptions": [ "x", "y" ] }],
+     key-spacing: "off" */
   var xA = this.width / 2;
   var yA = this.height / 2;
   var shortSide = Math.min( xA, yA );
diff --git a/js/shape.js b/js/shape.js
index 96af10b..40c927c 100644
--- a/js/shape.js
+++ b/js/shape.js
@@ -5,8 +5,8 @@
 ( function( root, factory ) {
   // module definition
   if ( typeof module == 'object' && module.exports ) {
-    /* globals module, require */ // CommonJS
-    module.exports = factory( require('./boilerplate'),  require('./vector'),
+    // CommonJS
+    module.exports = factory( require('./boilerplate'), require('./vector'),
         require('./path-command'), require('./anchor') );
   } else {
     // browser global
diff --git a/js/svg-renderer.js b/js/svg-renderer.js
index d2ef7ee..df876a8 100644
--- a/js/svg-renderer.js
+++ b/js/svg-renderer.js
@@ -5,7 +5,7 @@
 ( function( root, factory ) {
   // module definition
   if ( typeof module == 'object' && module.exports ) {
-    /* globals module */ // CommonJS
+    // CommonJS
     module.exports = factory();
   } else {
     // browser global
diff --git a/js/vector.js b/js/vector.js
index f06f796..b896526 100644
--- a/js/vector.js
+++ b/js/vector.js
@@ -5,7 +5,7 @@
 ( function( root, factory ) {
   // module definition
   if ( typeof module == 'object' && module.exports ) {
-    /* globals module, require */ // CommonJS
+    // CommonJS
     module.exports = factory( require('./boilerplate') );
   } else {
     // browser global
@@ -120,10 +120,10 @@ Vector.prototype.transform = function( translation, rotation, scale ) {
   return this;
 };
 
-Vector.prototype.lerp = function( pos, t ) {
-  this.x = utils.lerp( this.x, pos.x || 0, t );
-  this.y = utils.lerp( this.y, pos.y || 0, t );
-  this.z = utils.lerp( this.z, pos.z || 0, t );
+Vector.prototype.lerp = function( pos, alpha ) {
+  this.x = utils.lerp( this.x, pos.x || 0, alpha );
+  this.y = utils.lerp( this.y, pos.y || 0, alpha );
+  this.z = utils.lerp( this.z, pos.z || 0, alpha );
   return this;
 };
 
diff --git a/package-lock.json b/package-lock.json
index b0c0800..9459dde 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -4,6 +4,86 @@
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
+    "@babel/code-frame": {
+      "version": "7.0.0",
+      "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.0.0.tgz",
+      "integrity": "sha512-OfC2uemaknXr87bdLUkWog7nYuliM9Ij5HUcajsVcMCpQrcLmtxRbVFTIqmcSkSeYRBFBRxs2FiUqFJDLdiebA==",
+      "dev": true,
+      "requires": {
+        "@babel/highlight": "^7.0.0"
+      }
+    },
+    "@babel/highlight": {
+      "version": "7.0.0",
+      "resolved": "https://registry.npmjs.org/@babel/highlight/-/highlight-7.0.0.tgz",
+      "integrity": "sha512-UFMC4ZeFC48Tpvj7C8UgLvtkaUuovQX+5xNWrsIoMG8o2z+XFKjKaN9iVmS84dPwVN00W4wPmqvYoZF3EGAsfw==",
+      "dev": true,
+      "requires": {
+        "chalk": "^2.0.0",
+        "esutils": "^2.0.2",
+        "js-tokens": "^4.0.0"
+      }
+    },
+    "acorn": {
+      "version": "6.1.1",
+      "resolved": "https://registry.npmjs.org/acorn/-/acorn-6.1.1.tgz",
+      "integrity": "sha512-jPTiwtOxaHNaAPg/dmrJ/beuzLRnXtB0kQPQ8JpotKJgTB6rX6c8mlf315941pyjBSaPg8NHXS9fhP4u17DpGA==",
+      "dev": true
+    },
+    "acorn-jsx": {
+      "version": "5.0.1",
+      "resolved": "https://registry.npmjs.org/acorn-jsx/-/acorn-jsx-5.0.1.tgz",
+      "integrity": "sha512-HJ7CfNHrfJLlNTzIEUTj43LNWGkqpRLxm3YjAlcD0ACydk9XynzYsCBHxut+iqt+1aBXkx9UP/w/ZqMr13XIzg==",
+      "dev": true
+    },
+    "ajv": {
+      "version": "6.10.0",
+      "resolved": "https://registry.npmjs.org/ajv/-/ajv-6.10.0.tgz",
+      "integrity": "sha512-nffhOpkymDECQyR0mnsUtoCE8RlX38G0rYP+wgLWFyZuUyuuojSSvi/+euOiQBIn63whYwYVIIH1TvE3tu4OEg==",
+      "dev": true,
+      "requires": {
+        "fast-deep-equal": "^2.0.1",
+        "fast-json-stable-stringify": "^2.0.0",
+        "json-schema-traverse": "^0.4.1",
+        "uri-js": "^4.2.2"
+      }
+    },
+    "ansi-escapes": {
+      "version": "3.2.0",
+      "resolved": "https://registry.npmjs.org/ansi-escapes/-/ansi-escapes-3.2.0.tgz",
+      "integrity": "sha512-cBhpre4ma+U0T1oM5fXg7Dy1Jw7zzwv7lt/GoCpr+hDQJoYnKVPLL4dCvSEFMmQurOQvSrwT7SL/DAlhBI97RQ==",
+      "dev": true
+    },
+    "ansi-regex": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-3.0.0.tgz",
+      "integrity": "sha1-7QMXwyIGT3lGbAKWa922Bas32Zg=",
+      "dev": true
+    },
+    "ansi-styles": {
+      "version": "3.2.1",
+      "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-3.2.1.tgz",
+      "integrity": "sha512-VT0ZI6kZRdTh8YyJw3SMbYm/u+NqfsAxEpWO0Pf9sq8/e94WxxOpPKx9FR1FlyCtOVDNOQ+8ntlqFxiRc+r5qA==",
+      "dev": true,
+      "requires": {
+        "color-convert": "^1.9.0"
+      }
+    },
+    "argparse": {
+      "version": "1.0.10",
+      "resolved": "https://registry.npmjs.org/argparse/-/argparse-1.0.10.tgz",
+      "integrity": "sha512-o5Roy6tNG4SL/FOkCAN6RzjiakZS25RLYFrcMttJqbdd8BWrnA+fGz57iN5Pb06pvBGvl5gQ0B48dJlslXvoTg==",
+      "dev": true,
+      "requires": {
+        "sprintf-js": "~1.0.2"
+      }
+    },
+    "astral-regex": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/astral-regex/-/astral-regex-1.0.0.tgz",
+      "integrity": "sha512-+Ryf6g3BKoRc7jfp7ad8tM4TtMiaWvbF/1/sQcZPkkS7ag3D5nMBCe2UfOTONtAkaG0tO0ij3C5Lwmf1EiyjHg==",
+      "dev": true
+    },
     "balanced-match": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/balanced-match/-/balanced-match-1.0.0.tgz",
@@ -20,16 +100,59 @@
         "concat-map": "0.0.1"
       }
     },
-    "cli": {
-      "version": "1.0.1",
-      "resolved": "https://registry.npmjs.org/cli/-/cli-1.0.1.tgz",
-      "integrity": "sha1-IoF1NPJL+klQw01TLUjsvGIbjBQ=",
+    "callsites": {
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/callsites/-/callsites-3.1.0.tgz",
+      "integrity": "sha512-P8BjAsXvZS+VIDUI11hHCQEv74YT67YUi5JJFNWIqL235sBmjX4+qx9Muvls5ivyNENctx46xQLQ3aTuE7ssaQ==",
+      "dev": true
+    },
+    "chalk": {
+      "version": "2.4.2",
+      "resolved": "https://registry.npmjs.org/chalk/-/chalk-2.4.2.tgz",
+      "integrity": "sha512-Mti+f9lpJNcwF4tWV8/OrTTtF1gZi+f8FqlyAdouralcFWFQWF2+NgCHShjkCb+IFBLq9buZwE1xckQU4peSuQ==",
       "dev": true,
       "requires": {
-        "exit": "0.1.2",
-        "glob": "^7.1.1"
+        "ansi-styles": "^3.2.1",
+        "escape-string-regexp": "^1.0.5",
+        "supports-color": "^5.3.0"
       }
     },
+    "chardet": {
+      "version": "0.7.0",
+      "resolved": "https://registry.npmjs.org/chardet/-/chardet-0.7.0.tgz",
+      "integrity": "sha512-mT8iDcrh03qDGRRmoA2hmBJnxpllMR+0/0qlzjqZES6NdiWDcZkCNAk4rPFZ9Q85r27unkiNNg8ZOiwZXBHwcA==",
+      "dev": true
+    },
+    "cli-cursor": {
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/cli-cursor/-/cli-cursor-2.1.0.tgz",
+      "integrity": "sha1-s12sN2R5+sw+lHR9QdDQ9SOP/LU=",
+      "dev": true,
+      "requires": {
+        "restore-cursor": "^2.0.0"
+      }
+    },
+    "cli-width": {
+      "version": "2.2.0",
+      "resolved": "https://registry.npmjs.org/cli-width/-/cli-width-2.2.0.tgz",
+      "integrity": "sha1-/xnt6Kml5XkyQUewwR8PvLq+1jk=",
+      "dev": true
+    },
+    "color-convert": {
+      "version": "1.9.3",
+      "resolved": "https://registry.npmjs.org/color-convert/-/color-convert-1.9.3.tgz",
+      "integrity": "sha512-QfAUtd+vFdAtFQcC8CCyYt1fYWxSqAiK2cSD6zDB8N3cpsEBAvRxp9zOGg6G/SHHJYAT88/az/IuDGALsNVbGg==",
+      "dev": true,
+      "requires": {
+        "color-name": "1.1.3"
+      }
+    },
+    "color-name": {
+      "version": "1.1.3",
+      "resolved": "https://registry.npmjs.org/color-name/-/color-name-1.1.3.tgz",
+      "integrity": "sha1-p9BVi9icQveV3UIyj3QIMcpTvCU=",
+      "dev": true
+    },
     "commander": {
       "version": "2.19.0",
       "resolved": "https://registry.npmjs.org/commander/-/commander-2.19.0.tgz",
@@ -42,80 +165,238 @@
       "integrity": "sha1-2Klr13/Wjfd5OnMDajug1UBdR3s=",
       "dev": true
     },
-    "console-browserify": {
-      "version": "1.1.0",
-      "resolved": "https://registry.npmjs.org/console-browserify/-/console-browserify-1.1.0.tgz",
-      "integrity": "sha1-8CQcRXMKn8YyOyBtvzjtx0HQuxA=",
+    "cross-spawn": {
+      "version": "6.0.5",
+      "resolved": "https://registry.npmjs.org/cross-spawn/-/cross-spawn-6.0.5.tgz",
+      "integrity": "sha512-eTVLrBSt7fjbDygz805pMnstIs2VTBNkRm0qxZd+M7A5XDdxVRWO5MxGBXZhjY4cqLYLdtrGqRf8mBPmzwSpWQ==",
       "dev": true,
       "requires": {
-        "date-now": "^0.1.4"
+        "nice-try": "^1.0.4",
+        "path-key": "^2.0.1",
+        "semver": "^5.5.0",
+        "shebang-command": "^1.2.0",
+        "which": "^1.2.9"
       }
     },
-    "core-util-is": {
-      "version": "1.0.2",
-      "resolved": "https://registry.npmjs.org/core-util-is/-/core-util-is-1.0.2.tgz",
-      "integrity": "sha1-tf1UIgqivFq1eqtxQMlAdUUDwac=",
+    "debug": {
+      "version": "4.1.1",
+      "resolved": "https://registry.npmjs.org/debug/-/debug-4.1.1.tgz",
+      "integrity": "sha512-pYAIzeRo8J6KPEaJ0VWOh5Pzkbw/RetuzehGM7QRRX5he4fPHx2rdKMB256ehJCkX+XRQm16eZLqLNS8RSZXZw==",
+      "dev": true,
+      "requires": {
+        "ms": "^2.1.1"
+      }
+    },
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@@ -265,11 +940,44 @@
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 }
diff --git a/package.json b/package.json
index ec026b6..4add996 100644
--- a/package.json
+++ b/package.json
@@ -11,7 +11,7 @@
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diff --git a/tasks/.eslintrc.json b/tasks/.eslintrc.json
new file mode 100644
index 0000000..180e433
--- /dev/null
+++ b/tasks/.eslintrc.json
@@ -0,0 +1,26 @@
+{
+  "extends": "../.eslintrc.json",
+  "env": {
+    "browser": false
+  },
+  "parserOptions": {
+    "ecmaVersion": 2018
+  },
+  "globals": {
+    "console": "readonly"
+  },
+  "rules": {
+    "callback-return": "error",
+    "global-require": "error",
+    "handle-callback-err": "error",
+    "id-length": [ "error", {
+      "min": 2,
+      "max": 30
+    }],
+    "max-params": [ "error", {
+      "max": 4
+    }],
+    "no-console": "off",
+    "no-var": "error"
+  }
+}
diff --git a/tasks/.jshintrc b/tasks/.jshintrc
deleted file mode 100644
index 55b1ce2..0000000
--- a/tasks/.jshintrc
+++ /dev/null
@@ -1,6 +0,0 @@
-{
-  "esversion": 6,
-  "node": true,
-  "unused": true,
-  "undef": true
-}
diff --git a/tasks/bundle.js b/tasks/bundle.js
index 70d846c..75f697a 100644
--- a/tasks/bundle.js
+++ b/tasks/bundle.js
@@ -4,12 +4,12 @@ const execSync = require('child_process').execSync;
 // get file paths from index.js
 const indexPath = 'js/index.js';
 let indexSrc = fs.readFileSync( `./${indexPath}`, 'utf8' );
-let cjsBlockRegex = /module\.exports = factory\([\w ,'\.\-\(\)\/\n]+;/i;
+let cjsBlockRegex = /module\.exports = factory\([\w ,'.\-()/\n]+;/i;
 let cjsBlockMatch = indexSrc.match( cjsBlockRegex );
-let paths = cjsBlockMatch[0].match( /require\('([\.\-\/\w]+)'\)/gi );
+let paths = cjsBlockMatch[0].match( /require\('([.\-/\w]+)'\)/gi );
 
 paths = paths.map( function( path ) {
-  return path.replace( `require('.`, 'js' ).replace( `')`, '.js' );
+  return path.replace( "require('.", 'js' ).replace( "')", '.js' );
 });
 paths.push( indexPath );