diff --git a/.eslintrc b/.eslintrc
index a726e4c225..a87319bb62 100644
--- a/.eslintrc
+++ b/.eslintrc
@@ -3,7 +3,6 @@
   "rules": {
     "strict": 0,
     "no-underscore-dangle": 0,
-    "no-unused-vars": 0,
     "curly": 0,
     "no-multi-spaces": 0,
     "key-spacing": 0,
diff --git a/src/babel/api/register/cache.js b/src/babel/api/register/cache.js
index 16c947ba0a..1e163f8728 100644
--- a/src/babel/api/register/cache.js
+++ b/src/babel/api/register/cache.js
@@ -1,5 +1,4 @@
 import path from "path";
-import os from "os";
 import fs from "fs";
 import homeOrTmp from "home-or-tmp";
 
diff --git a/src/babel/api/register/node.js b/src/babel/api/register/node.js
index 8a1f541d74..86bee9a300 100644
--- a/src/babel/api/register/node.js
+++ b/src/babel/api/register/node.js
@@ -6,7 +6,6 @@ import * as babel from "../node";
 import each from "lodash/collection/each";
 import * as util from  "../../util";
 import fs from "fs";
-import slash from "slash";
 
 sourceMapSupport.install({
   handleUncaughtExceptions: false,
diff --git a/src/babel/generation/generators/jsx.js b/src/babel/generation/generators/jsx.js
index 03d24af495..3dee3c683e 100644
--- a/src/babel/generation/generators/jsx.js
+++ b/src/babel/generation/generators/jsx.js
@@ -1,4 +1,3 @@
-import each from "lodash/collection/each";
 import * as t from "../../types";
 
 export function JSXAttribute(node, print) {
diff --git a/src/babel/generation/generators/modules.js b/src/babel/generation/generators/modules.js
index 88765cacc4..00a66a07db 100644
--- a/src/babel/generation/generators/modules.js
+++ b/src/babel/generation/generators/modules.js
@@ -1,4 +1,3 @@
-import each from "lodash/collection/each";
 import * as t from "../../types";
 
 export function ImportSpecifier(node, print) {
diff --git a/src/babel/generation/generators/template-literals.js b/src/babel/generation/generators/template-literals.js
index 6f8d7ca873..da2bdc8d3a 100644
--- a/src/babel/generation/generators/template-literals.js
+++ b/src/babel/generation/generators/template-literals.js
@@ -1,5 +1,3 @@
-import each from "lodash/collection/each";
-
 export function TaggedTemplateExpression(node, print) {
   print(node.tag);
   print(node.quasi);
diff --git a/src/babel/generation/generators/types.js b/src/babel/generation/generators/types.js
index 3452bd898c..9d826f12dc 100644
--- a/src/babel/generation/generators/types.js
+++ b/src/babel/generation/generators/types.js
@@ -1,6 +1,5 @@
 /* eslint quotes: 0 */
 
-import each from "lodash/collection/each";
 import * as t from "../../types";
 
 export function Identifier(node) {
diff --git a/src/babel/transformation/file/index.js b/src/babel/transformation/file/index.js
index 175defe4de..1ea0385b03 100644
--- a/src/babel/transformation/file/index.js
+++ b/src/babel/transformation/file/index.js
@@ -9,7 +9,6 @@ import isFunction from "lodash/lang/isFunction";
 import isAbsolute from "path-is-absolute";
 import resolveRc from "../../tools/resolve-rc";
 import sourceMap from "source-map";
-import transform from "./../index";
 import generate from "../../generation";
 import codeFrame from "../../helpers/code-frame";
 import defaults from "lodash/object/defaults";
@@ -18,12 +17,10 @@ import traverse from "../../traversal";
 import assign from "lodash/object/assign";
 import Logger from "./logger";
 import parse from "../../helpers/parse";
-import Scope from "../../traversal/scope";
 import merge from "../../helpers/merge";
 import slash from "slash";
 import clone from "lodash/lang/clone";
 import * as util from  "../../util";
-import * as api from  "../../api/node";
 import path from "path";
 import * as t from "../../types";
 
@@ -348,8 +345,6 @@ export default class File {
       throw new ReferenceError(`Unknown helper ${name}`);
     }
 
-    var program = this.ast.program;
-
     var declar = this.declarations[name];
     if (declar) return declar;
 
@@ -491,7 +486,7 @@ export default class File {
     this.metadata.modules = modules;
   }
 
-  transform(dependencyGraph) {
+  transform() {
     this.call("pre");
     for (var pass of (this.transformerStack: Array)) {
       pass.transform();
@@ -534,7 +529,7 @@ export default class File {
     }
   }
 
-  addCode(code: string, parseCode?) {
+  addCode(code: string) {
     code = (code || "") + "";
     code = this.parseInputSourceMap(code);
     this.code = code;
diff --git a/src/babel/transformation/helpers/build-react-transformer.js b/src/babel/transformation/helpers/build-react-transformer.js
index a2bd60b4b8..beb2158aee 100644
--- a/src/babel/transformation/helpers/build-react-transformer.js
+++ b/src/babel/transformation/helpers/build-react-transformer.js
@@ -10,7 +10,7 @@ import * as react from "./react";
 import * as t from "../../types";
 
 export default function (exports, opts) {
-  exports.JSXIdentifier = function (node, parent) {
+  exports.JSXIdentifier = function (node) {
     if (node.name === "this" && this.isReferenced()) {
       return t.thisExpression();
     } else if (esutils.keyword.isIdentifierNameES6(node.name)) {
@@ -20,7 +20,7 @@ export default function (exports, opts) {
     }
   };
 
-  exports.JSXNamespacedName = function (node, parent, scope, file) {
+  exports.JSXNamespacedName = function () {
     throw this.errorWithNode(messages.get("JSXNamespacedTags"));
   };
 
diff --git a/src/babel/transformation/helpers/call-delegate.js b/src/babel/transformation/helpers/call-delegate.js
index 5313e8e27e..ba899aac84 100644
--- a/src/babel/transformation/helpers/call-delegate.js
+++ b/src/babel/transformation/helpers/call-delegate.js
@@ -1,4 +1,3 @@
-import traverse from "../../traversal";
 import * as t from "../../types";
 
 var visitor = {
diff --git a/src/babel/transformation/helpers/define-map.js b/src/babel/transformation/helpers/define-map.js
index 5d92b5c9ea..ca77074330 100644
--- a/src/babel/transformation/helpers/define-map.js
+++ b/src/babel/transformation/helpers/define-map.js
@@ -1,5 +1,3 @@
-import cloneDeep from "lodash/lang/cloneDeep";
-import traverse from "../../traversal";
 import each from "lodash/collection/each";
 import has from "lodash/object/has";
 import * as t from "../../types";
diff --git a/src/babel/transformation/helpers/react.js b/src/babel/transformation/helpers/react.js
index 5e0e824d18..38288627a8 100644
--- a/src/babel/transformation/helpers/react.js
+++ b/src/babel/transformation/helpers/react.js
@@ -1,4 +1,3 @@
-import isString from "lodash/lang/isString";
 import * as t from "../../types";
 
 var isCreateClassCallExpression = t.buildMatchMemberExpression("React.createClass");
@@ -26,10 +25,6 @@ export function isCompatTag(tagName) {
   return tagName && /^[a-z]|\-/.test(tagName);
 }
 
-function isStringLiteral(node) {
-  return t.isLiteral(node) && isString(node.value);
-}
-
 function cleanJSXElementLiteralChild(child, args) {
   var lines = child.value.split(/\r\n|\n|\r/);
 
diff --git a/src/babel/transformation/helpers/remap-async-to-generator.js b/src/babel/transformation/helpers/remap-async-to-generator.js
index 4b4923ac22..64cfb2f551 100644
--- a/src/babel/transformation/helpers/remap-async-to-generator.js
+++ b/src/babel/transformation/helpers/remap-async-to-generator.js
@@ -1,7 +1,7 @@
 import * as t from "../../types";
 
 var awaitVisitor = {
-  enter(node, parent, scope, state) {
+  enter(node) {
     if (t.isFunction(node)) this.skip();
 
     if (t.isAwaitExpression(node)) {
diff --git a/src/babel/transformation/modules/_default.js b/src/babel/transformation/modules/_default.js
index 40922bec88..04627fe265 100644
--- a/src/babel/transformation/modules/_default.js
+++ b/src/babel/transformation/modules/_default.js
@@ -1,12 +1,11 @@
 import * as messages from "../../messages";
-import traverse from "../../traversal";
 import extend from "lodash/object/extend";
 import object from "../../helpers/object";
 import * as util from  "../../util";
 import * as t from "../../types";
 
 var remapVisitor = {
-  enter(node, parent, scope, formatter) {
+  enter(node) {
     if (node._skipModulesRemap) {
       return this.skip();
     }
diff --git a/src/babel/transformation/modules/common.js b/src/babel/transformation/modules/common.js
index c631268768..2fd23d5af1 100644
--- a/src/babel/transformation/modules/common.js
+++ b/src/babel/transformation/modules/common.js
@@ -1,5 +1,4 @@
 import DefaultFormatter from "./_default";
-import includes from "lodash/collection/includes";
 import * as util from  "../../util";
 import * as t from "../../types";
 
@@ -84,7 +83,7 @@ export default class CommonJSFormatter extends DefaultFormatter {
     }, true));
   }
 
-  exportSpecifier(specifier, node, nodes) {
+  exportSpecifier(specifier) {
     if (this.doDefaultExportInterop(specifier)) {
       this.hasDefaultOnlyExport = true;
     }
@@ -92,7 +91,7 @@ export default class CommonJSFormatter extends DefaultFormatter {
     DefaultFormatter.prototype.exportSpecifier.apply(this, arguments);
   }
 
-  exportDeclaration(node, nodes) {
+  exportDeclaration(node) {
     if (this.doDefaultExportInterop(node)) {
       this.hasDefaultOnlyExport = true;
     }
@@ -101,8 +100,6 @@ export default class CommonJSFormatter extends DefaultFormatter {
   }
 
   _getExternalReference(node, nodes) {
-    var source = node.source.value;
-
     var call = t.callExpression(t.identifier("require"), [node.source]);
     var uid;
 
diff --git a/src/babel/transformation/modules/system.js b/src/babel/transformation/modules/system.js
index 542b84f228..6dab2e44c2 100644
--- a/src/babel/transformation/modules/system.js
+++ b/src/babel/transformation/modules/system.js
@@ -3,7 +3,6 @@ import AMDFormatter from "./amd";
 import object from  "../../helpers/object";
 import * as util from  "../../util";
 import last from "lodash/array/last";
-import each from "lodash/collection/each";
 import map from "lodash/collection/map";
 import * as t from "../../types";
 
diff --git a/src/babel/transformation/transformer-pass.js b/src/babel/transformation/transformer-pass.js
index 62e91cd7ca..e004ce8eb8 100644
--- a/src/babel/transformation/transformer-pass.js
+++ b/src/babel/transformation/transformer-pass.js
@@ -1,4 +1,3 @@
-import includes from "lodash/collection/includes";
 import traverse from "../traversal";
 
 /**
diff --git a/src/babel/transformation/transformer.js b/src/babel/transformation/transformer.js
index 3f700974d9..9ad9400cc4 100644
--- a/src/babel/transformation/transformer.js
+++ b/src/babel/transformation/transformer.js
@@ -4,7 +4,6 @@ import isFunction from "lodash/lang/isFunction";
 import traverse from "../traversal";
 import isObject from "lodash/lang/isObject";
 import assign from "lodash/object/assign";
-import * as acorn from "../../acorn";
 import File from "./file";
 import each from "lodash/collection/each";
 
diff --git a/src/babel/transformation/transformers/es6/block-scoping.js b/src/babel/transformation/transformers/es6/block-scoping.js
index 67c5ad1711..be521c5e9a 100644
--- a/src/babel/transformation/transformers/es6/block-scoping.js
+++ b/src/babel/transformation/transformers/es6/block-scoping.js
@@ -597,7 +597,6 @@ class BlockScoping {
       t.variableDeclarator(ret, call)
     ]));
 
-    var loop = this.loop;
     var retCheck;
     var has = this.has;
     var cases = [];
diff --git a/src/babel/transformation/transformers/es6/classes.js b/src/babel/transformation/transformers/es6/classes.js
index d8f54e8ac0..375e9eb99c 100644
--- a/src/babel/transformation/transformers/es6/classes.js
+++ b/src/babel/transformation/transformers/es6/classes.js
@@ -4,9 +4,6 @@ import * as nameMethod from "../../helpers/name-method";
 import * as defineMap from "../../helpers/define-map";
 import * as messages from "../../../messages";
 import * as util from  "../../../util";
-import traverse from "../../../traversal";
-import each from "lodash/collection/each";
-import has from "lodash/object/has";
 import * as t from "../../../types";
 
 const PROPERTY_COLLISION_METHOD_NAME = "__initializeProperties";
@@ -35,22 +32,6 @@ var collectPropertyReferencesVisitor = {
   }
 };
 
-var constructorVisitor = {
-  ThisExpression: {
-    enter(node, parent, scope, ref) {
-      return ref;
-    }
-  },
-
-  Function: {
-    enter(node) {
-      if (!node.shadow) {
-        this.skip();
-      }
-    }
-  }
-};
-
 var verifyConstructorVisitor = {
   MethodDefinition: {
     enter() {
@@ -141,8 +122,6 @@ class ClassTransformer {
 
   run() {
     var superName = this.superName;
-    var className = this.className;
-    var classBody = this.node.body.body;
     var classRef  = this.classRef;
     var file      = this.file;
 
@@ -276,9 +255,6 @@ class ClassTransformer {
 
   buildBody() {
     var constructorBody = this.constructorBody;
-    var constructor     = this.constructor;
-    var className       = this.className;
-    var superName       = this.superName;
     var classBody       = this.node.body.body;
     var body            = this.body;
 
@@ -501,8 +477,6 @@ class ClassTransformer {
    */
 
   pushProperty(node: { type: "ClassProperty" }) {
-    var key;
-
     this.scope.traverse(node, collectPropertyReferencesVisitor, {
       references: this.instancePropRefs,
       scope:      this.scope
diff --git a/src/babel/transformation/transformers/es6/constants.js b/src/babel/transformation/transformers/es6/constants.js
index 518ee38609..54021f8058 100644
--- a/src/babel/transformation/transformers/es6/constants.js
+++ b/src/babel/transformation/transformers/es6/constants.js
@@ -1,5 +1,4 @@
 import * as messages from "../../../messages";
-import * as t from "../../../types";
 
 export function AssignmentExpression(node, parent, scope, file) {
   var ids = this.getBindingIdentifiers();
diff --git a/src/babel/transformation/transformers/es6/destructuring.js b/src/babel/transformation/transformers/es6/destructuring.js
index 4ab5a0815c..4a592171ce 100644
--- a/src/babel/transformation/transformers/es6/destructuring.js
+++ b/src/babel/transformation/transformers/es6/destructuring.js
@@ -498,7 +498,6 @@ class DestructuringTransformer {
     // trying to destructure a value that we can't evaluate more than once so we
     // need to save it to a variable
 
-    var shouldMemoise = true;
     if (!t.isArrayExpression(ref) && !t.isMemberExpression(ref)) {
       var memo = this.scope.maybeGenerateMemoised(ref, true);
       if (memo) {
diff --git a/src/babel/transformation/transformers/es6/parameters.default.js b/src/babel/transformation/transformers/es6/parameters.default.js
index 4aa442196c..547c91b754 100644
--- a/src/babel/transformation/transformers/es6/parameters.default.js
+++ b/src/babel/transformation/transformers/es6/parameters.default.js
@@ -1,6 +1,5 @@
 import callDelegate from "../../helpers/call-delegate";
 import * as util from  "../../../util";
-import traverse from  "../../../traversal";
 import * as t from "../../../types";
 
 var hasDefaults = function (node) {
diff --git a/src/babel/transformation/transformers/es6/spec.block-scoping.js b/src/babel/transformation/transformers/es6/spec.block-scoping.js
index 6bc05a7793..04aa5cc3c0 100644
--- a/src/babel/transformation/transformers/es6/spec.block-scoping.js
+++ b/src/babel/transformation/transformers/es6/spec.block-scoping.js
@@ -1,4 +1,3 @@
-import traverse from "../../../traversal";
 import * as t from "../../../types";
 
 var visitor = {
diff --git a/src/babel/transformation/transformers/es6/spread.js b/src/babel/transformation/transformers/es6/spread.js
index 73c9f782b1..70e9e471e2 100644
--- a/src/babel/transformation/transformers/es6/spread.js
+++ b/src/babel/transformation/transformers/es6/spread.js
@@ -1,4 +1,3 @@
-import includes from "lodash/collection/includes";
 import * as t from "../../../types";
 
 function getSpreadLiteral(spread, scope) {
diff --git a/src/babel/transformation/transformers/es6/tail-call.js b/src/babel/transformation/transformers/es6/tail-call.js
index 6f438180ed..78eb809380 100644
--- a/src/babel/transformation/transformers/es6/tail-call.js
+++ b/src/babel/transformation/transformers/es6/tail-call.js
@@ -1,7 +1,6 @@
 import reduceRight from "lodash/collection/reduceRight";
 import * as messages from "../../../messages";
 import flatten from "lodash/array/flatten";
-import traverse from "../../../traversal";
 import * as util from  "../../../util";
 import map from "lodash/collection/map";
 import * as t from "../../../types";
@@ -21,7 +20,7 @@ function returnBlock(expr) {
 }
 
 var visitor = {
-  enter(node, parent, scope, state) {
+  enter(node, parent) {
     if (t.isTryStatement(parent)) {
       if (node === parent.block) {
         this.skip();
@@ -35,7 +34,7 @@ var visitor = {
     return state.subTransform(node.argument);
   },
 
-  Function(node, parent, scope, state) {
+  Function() {
     this.skip();
   },
 
@@ -128,7 +127,6 @@ class TailCallTransformer {
   }
 
   run() {
-    var scope = this.scope;
     var node  = this.node;
 
     // only tail recursion can be optimized as for now, so we can skip anonymous
diff --git a/src/babel/transformation/transformers/es7/comprehensions.js b/src/babel/transformation/transformers/es7/comprehensions.js
index e3b51ed050..65aac03875 100644
--- a/src/babel/transformation/transformers/es7/comprehensions.js
+++ b/src/babel/transformation/transformers/es7/comprehensions.js
@@ -10,7 +10,7 @@ export var metadata = {
 export function ComprehensionExpression(node, parent, scope, file) {
   var callback = array;
   if (node.generator) callback = generator;
-  return callback(node, parent, scope, file);
+  return callback(node, parent, scope);
 }
 
 function generator(node) {
@@ -25,7 +25,7 @@ function generator(node) {
   return t.callExpression(container, []);
 }
 
-function array(node, parent, scope, file) {
+function array(node, parent, scope) {
   var uid = scope.generateUidIdentifierBasedOnNode(parent);
 
   var container = util.template("array-comprehension-container", {
diff --git a/src/babel/transformation/transformers/minification/dead-code-elimination.js b/src/babel/transformation/transformers/minification/dead-code-elimination.js
index 6927948231..0a5a17c96b 100644
--- a/src/babel/transformation/transformers/minification/dead-code-elimination.js
+++ b/src/babel/transformation/transformers/minification/dead-code-elimination.js
@@ -33,7 +33,7 @@ export function ReferencedIdentifier(node, parent, scope) {
   }
   if (!replacement) return;
 
-  if (this.findParent((node) => replacement)) {
+  if (this.findParent((node) => node === replacement)) {
     return;
   }
 
@@ -67,7 +67,7 @@ export function ConditionalExpression(node, parent, scope) {
 }
 
 export var IfStatement = {
-  exit(node, parent, scope) {
+  exit(node) {
     var consequent = node.consequent;
     var alternate  = node.alternate;
     var test = node.test;
diff --git a/src/babel/transformation/transformers/minification/inline-expressions.js b/src/babel/transformation/transformers/minification/inline-expressions.js
index 16abe4d856..06671a3db9 100644
--- a/src/babel/transformation/transformers/minification/inline-expressions.js
+++ b/src/babel/transformation/transformers/minification/inline-expressions.js
@@ -6,7 +6,7 @@ export var metadata = {
 };
 
 export var Expression = {
-  exit(node, parent, scope) {
+  exit() {
     var res = this.evaluate();
     if (res.confident) return t.valueToNode(res.value);
   }
diff --git a/src/babel/transformation/transformers/minification/remove-debugger.js b/src/babel/transformation/transformers/minification/remove-debugger.js
index 8c51f63c49..0ac60ffa59 100644
--- a/src/babel/transformation/transformers/minification/remove-debugger.js
+++ b/src/babel/transformation/transformers/minification/remove-debugger.js
@@ -1,5 +1,3 @@
-import * as t from "../../../types";
-
 export var metadata = {
   optional: true,
   group: "builtin-setup"
diff --git a/src/babel/transformation/transformers/optimisation/flow.for-of.js b/src/babel/transformation/transformers/optimisation/flow.for-of.js
index 0f031a9b51..c61b406137 100644
--- a/src/babel/transformation/transformers/optimisation/flow.for-of.js
+++ b/src/babel/transformation/transformers/optimisation/flow.for-of.js
@@ -1,5 +1,4 @@
 import { _ForOfStatementArray } from "../es6/for-of";
-import * as t from "../../../types";
 
 export var metadata = {
   optional: true
diff --git a/src/babel/transformation/transformers/optimisation/react.constant-elements.js b/src/babel/transformation/transformers/optimisation/react.constant-elements.js
index 608d5c41c5..d0d862de3c 100644
--- a/src/babel/transformation/transformers/optimisation/react.constant-elements.js
+++ b/src/babel/transformation/transformers/optimisation/react.constant-elements.js
@@ -1,5 +1,3 @@
-import * as react from "../../helpers/react";
-
 export var metadata = {
   optional: true
 };
diff --git a/src/babel/transformation/transformers/other/flow.js b/src/babel/transformation/transformers/other/flow.js
index 1b7db40498..d493527fd5 100644
--- a/src/babel/transformation/transformers/other/flow.js
+++ b/src/babel/transformation/transformers/other/flow.js
@@ -1,5 +1,3 @@
-import * as t from "../../../types";
-
 export function Flow(node) {
   this.remove();
 }
diff --git a/src/babel/transformation/transformers/other/runtime/index.js b/src/babel/transformation/transformers/other/runtime/index.js
index 27dd6c7a15..9b31bb031a 100644
--- a/src/babel/transformation/transformers/other/runtime/index.js
+++ b/src/babel/transformation/transformers/other/runtime/index.js
@@ -1,12 +1,7 @@
-import includes from "lodash/collection/includes";
-import traverse from "../../../../traversal";
-import * as util from  "../../../../util";
 import has from "lodash/object/has";
 import * as t from "../../../../types";
 import definitions from "./definitions";
 
-var isSymbolIterator = t.buildMatchMemberExpression("Symbol.iterator");
-
 const RUNTIME_MODULE_NAME = "babel-runtime";
 
 export var metadata = {
diff --git a/src/babel/transformation/transformers/other/strict.js b/src/babel/transformation/transformers/other/strict.js
index 956821ecf4..0d94b72125 100644
--- a/src/babel/transformation/transformers/other/strict.js
+++ b/src/babel/transformation/transformers/other/strict.js
@@ -1,4 +1,3 @@
-import * as messages from "../../../messages";
 import * as t from "../../../types";
 
 export var metadata = {
@@ -8,7 +7,7 @@ export var metadata = {
 const THIS_BREAK_KEYS = ["FunctionExpression", "FunctionDeclaration", "ClassExpression", "ClassDeclaration"];
 
 export var Program = {
-  enter(program, parent, scope, file) {
+  enter(program) {
     var first = program.body[0];
 
     var directive;
diff --git a/src/babel/transformation/transformers/spec/block-scoped-functions.js b/src/babel/transformation/transformers/spec/block-scoped-functions.js
index 61171c2730..feae389005 100644
--- a/src/babel/transformation/transformers/spec/block-scoped-functions.js
+++ b/src/babel/transformation/transformers/spec/block-scoped-functions.js
@@ -1,6 +1,6 @@
 import * as t from "../../../types";
 
-function statementList(key, path, file) {
+function statementList(key, path) {
   var paths = path.get(key);
 
   for (var i = 0; i < paths.length; i++) {
@@ -23,14 +23,14 @@ function statementList(key, path, file) {
   }
 }
 
-export function BlockStatement(node, parent, scope, file) {
+export function BlockStatement(node, parent) {
   if ((t.isFunction(parent) && parent.body === node) || t.isExportDeclaration(parent)) {
     return;
   }
 
-  statementList("body", this, file);
+  statementList("body", this);
 }
 
-export function SwitchCase(node, parent, scope, file) {
-  statementList("consequent", this, file);
+export function SwitchCase() {
+  statementList("consequent", this);
 }
diff --git a/src/babel/traversal/context.js b/src/babel/traversal/context.js
index a3b23acd90..c15004a9f6 100644
--- a/src/babel/traversal/context.js
+++ b/src/babel/traversal/context.js
@@ -1,5 +1,4 @@
 import NodePath from "./path";
-import compact from "lodash/array/compact";
 import * as t from "../types";
 
 export default class TraversalContext {
@@ -21,7 +20,7 @@ export default class TraversalContext {
     return path;
   }
 
-  visitMultiple(nodes, node, key) {
+  visitMultiple(nodes, node) {
     // nothing to traverse!
     if (nodes.length === 0) return false;
 
diff --git a/src/babel/traversal/index.js b/src/babel/traversal/index.js
index 6dcbadee9c..6c0e4ac178 100644
--- a/src/babel/traversal/index.js
+++ b/src/babel/traversal/index.js
@@ -69,12 +69,6 @@ var clearVisitor = {
   exit: clearNode
 };
 
-function clearComments(comments) {
-  for (var i = 0; i < comments.length; i++) {
-    clearNode(comments[i]);
-  }
-}
-
 traverse.removeProperties = function (tree) {
   traverse(tree, clearVisitor);
   clearNode(tree);
diff --git a/src/babel/traversal/path/index.js b/src/babel/traversal/path/index.js
index fe97227ba3..5044ded011 100644
--- a/src/babel/traversal/path/index.js
+++ b/src/babel/traversal/path/index.js
@@ -1,17 +1,6 @@
-import PathHoister from "./lib/hoister";
 import * as virtualTypes from "./lib/virtual-types";
-import * as messages from "../../messages";
-import isBoolean from "lodash/lang/isBoolean";
-import isNumber from "lodash/lang/isNumber";
-import isRegExp from "lodash/lang/isRegExp";
-import isString from "lodash/lang/isString";
-import codeFrame from "../../helpers/code-frame";
-import parse from "../../helpers/parse";
-import { explode } from "../visitors";
 import traverse from "../index";
-import includes from "lodash/collection/includes";
 import assign from "lodash/object/assign";
-import extend from "lodash/object/extend";
 import Scope from "../scope";
 import * as t from "../../types";
 
diff --git a/src/babel/traversal/path/removal.js b/src/babel/traversal/path/removal.js
index fd8b551816..be7b9ba55e 100644
--- a/src/babel/traversal/path/removal.js
+++ b/src/babel/traversal/path/removal.js
@@ -1,5 +1,4 @@
 import * as removalHooks from "./lib/removal-hooks";
-import * as t from "../../types";
 
 /**
  * Description
diff --git a/src/babel/traversal/scope/binding.js b/src/babel/traversal/scope/binding.js
index 88dfcdcbda..a8bc8c0ba8 100644
--- a/src/babel/traversal/scope/binding.js
+++ b/src/babel/traversal/scope/binding.js
@@ -86,7 +86,7 @@ export default class Binding {
    * Description
    */
 
-  isCompatibleWithType(newType): boolean {
+  isCompatibleWithType(): boolean {
     return false;
   }
 }
diff --git a/src/babel/traversal/scope/index.js b/src/babel/traversal/scope/index.js
index 6638180fc4..0f7e80e551 100644
--- a/src/babel/traversal/scope/index.js
+++ b/src/babel/traversal/scope/index.js
@@ -1,5 +1,4 @@
 import includes from "lodash/collection/includes";
-import { explode } from "../visitors";
 import traverse from "../index";
 import defaults from "lodash/object/defaults";
 import * as messages from "../../messages";
@@ -8,7 +7,6 @@ import globals from "globals";
 import flatten from "lodash/array/flatten";
 import extend from "lodash/object/extend";
 import object from "../../helpers/object";
-import each from "lodash/collection/each";
 import * as t from "../../types";
 
 var functionVariableVisitor = {
@@ -55,7 +53,7 @@ var programReferenceVisitor = {
   },
 
   ExportDeclaration: {
-    exit(node, parent, scope, state) {
+    exit(node, parent, scope) {
       var declar = node.declaration;
       if (t.isClassDeclaration(declar) || t.isFunctionDeclaration(declar)) {
         scope.getBinding(declar.id.name).reference();
@@ -74,15 +72,15 @@ var programReferenceVisitor = {
     state.addGlobal(node);
   },
 
-  AssignmentExpression(node, parent, scope, state) {
+  AssignmentExpression(node, parent, scope) {
     scope.registerConstantViolation(this.get("left"), this.get("right"));
   },
 
-  UpdateExpression(node, parent, scope, state) {
+  UpdateExpression(node, parent, scope) {
     scope.registerConstantViolation(this.get("argument"), null);
   },
 
-  UnaryExpression(node, parent, scope, state) {
+  UnaryExpression(node, parent, scope) {
     if (node.operator === "delete") scope.registerConstantViolation(this.get("left"), null);
   }
 };
diff --git a/src/babel/types/converters.js b/src/babel/types/converters.js
index 54672dee5b..1f74f43054 100644
--- a/src/babel/types/converters.js
+++ b/src/babel/types/converters.js
@@ -3,7 +3,6 @@ import isNumber from "lodash/lang/isNumber";
 import isRegExp from "lodash/lang/isRegExp";
 import isString from "lodash/lang/isString";
 import traverse from "../traversal";
-import each from "lodash/collection/each";
 import * as t from "./index";
 
 /**