diff --git a/src/components/JSONNode.js b/src/components/JSONNode.js
index 4825821..3e9df35 100644
--- a/src/components/JSONNode.js
+++ b/src/components/JSONNode.js
@@ -10,7 +10,7 @@ import { getInnerText, insideRect, findParentWithAttribute } from '../utils/domU
 import { stringConvert, valueType, isUrl } from  '../utils/typeUtils'
 import { compileJSONPointer, META, SELECTED, SELECTED_END, SELECTED_AFTER, SELECTED_BEFORE } from  '../eson'
 
-import type { ESONObjectProperty, ESON, SearchResultStatus, Path } from '../types'
+import type { ESON, SearchResultStatus, Path } from '../types'
 
 // TODO: rename SELECTED, SELECTED_END, etc to AREA_*? It's used for both selection and hovering
 const SELECTED_CLASS_NAMES = {
diff --git a/src/components/JSONNodeForm.js b/src/components/JSONNodeForm.js
index 2a67aa3..221a2bd 100644
--- a/src/components/JSONNodeForm.js
+++ b/src/components/JSONNodeForm.js
@@ -2,7 +2,7 @@
 
 import JSONNode from './JSONNode'
 
-import type { ESONObjectProperty, ESON, Path } from '../types'
+import type { ESON, Path } from '../types'
 
 /**
  * JSONNodeForm
@@ -22,7 +22,7 @@ export default class JSONNodeForm extends JSONNode {
   }
 
   // render a readonly property
-  renderProperty (prop?: ESONObjectProperty, index?: number, data: ESON, options: {escapeUnicode: boolean, isPropertyEditable: (Path) => boolean}) {
+  renderProperty (prop?: String, index?: number, eson: ESON, options: {escapeUnicode: boolean, isPropertyEditable: (Path) => boolean}) {
     const formOptions = Object.assign({}, options, { isPropertyEditable })
 
     return JSONNode.prototype.renderProperty.call(this, prop, index, data, formOptions)
diff --git a/src/components/TreeMode.js b/src/components/TreeMode.js
index 482a0dd..082861a 100644
--- a/src/components/TreeMode.js
+++ b/src/components/TreeMode.js
@@ -36,7 +36,10 @@ import {
 import { createFindKeyBinding } from '../utils/keyBindings'
 import { KEY_BINDINGS } from '../constants'
 
-import type { ESON, ESONPatch, JSONPath, Selection, ESONPointer } from '../types'
+import type {
+  ESON, ESONPatch, Selection, ESONPointer,
+  Path
+} from '../types'
 
 const AJV_OPTIONS = {
   allErrors: true,
@@ -707,7 +710,7 @@ export default class TreeMode extends Component {
     }
   }
 
-  findDataPathFromElement (element: Element) : JSONPath | null {
+  findDataPathFromElement (element: Element) : Path | null {
     const base = findBaseNode(element)
     const attr = base && base.getAttribute && base.getAttribute('data-path')
 
diff --git a/src/eson.js b/src/eson.js
index feb78d6..e9ebd7c 100644
--- a/src/eson.js
+++ b/src/eson.js
@@ -17,7 +17,7 @@ import last from 'lodash/last'
 import type {
   ESON, ESONPointer, Selection,
   Path,
-  JSONPath, JSONType
+  JSONType
 } from './types'
 
 export const SELECTED = 1
@@ -447,7 +447,7 @@ export function findSelectionIndices (root, rootPath, selection) {
 /**
  * Get the JSON paths from a selection, sorted from first to last
  */
-export function pathsFromSelection (eson, selection: Selection): JSONPath[] {
+export function pathsFromSelection (eson, selection: Selection): Path[] {
   // find the parent node shared by both start and end of the selection
   const rootPath = findRootPath(selection)
   const root = getIn(eson, rootPath)
@@ -465,10 +465,10 @@ export function pathsFromSelection (eson, selection: Selection): JSONPath[] {
 /**
  * Get the contents of a list with paths
  * @param {ESON} data
- * @param {JSONPath[]} paths
+ * @param {Path[]} paths
  * @return {Array.<{name: string, value: JSONType}>}
  */
-export function contentsFromPaths (data: ESON, paths: JSONPath[]) {
+export function contentsFromPaths (data: ESON, paths: Path[]) {
   return paths.map(path => {
     return {
       name: last(path),
@@ -482,7 +482,7 @@ export function contentsFromPaths (data: ESON, paths: JSONPath[]) {
  * Find the root path of a selection: the parent node shared by both start
  * and end of the selection
  * @param {Selection} selection
- * @return {JSONPath}
+ * @return {Path}
  */
 export function findRootPath(selection) {
   if (selection.before) {
@@ -509,7 +509,7 @@ export function findRootPath(selection) {
  * Find the common path of two paths.
  * For example findCommonRoot(['arr', '1', 'name'], ['arr', '1', 'address', 'contact']) returns ['arr', '1']
  */
-function findSharedPath (path1: JSONPath, path2: JSONPath): JSONPath {
+function findSharedPath (path1: Path, path2: Path): Path {
   let i = 0;
   while (i < path1.length && path1[i] === path2[i]) {
     i++;
@@ -616,16 +616,6 @@ export function containsCaseInsensitive (text: string, search: string): boolean
   return String(text).toLowerCase().indexOf(search.toLowerCase()) !== -1
 }
 
-/**
- * Test whether an array contains a specific item
- * @param {Array} array
- * @param {*} item
- * @return {boolean} Returnts true when item is in array, false otherwise.
- */
-function contains (array, item) {
-  return array.indexOf(item) !== -1
-}
-
 /**
  * Get a new "unique" id. Id's are created from an incremental counter.
  * @return {number}
diff --git a/src/patchEson.js b/src/patchEson.js
index ae8f02b..7ef8dd5 100644
--- a/src/patchEson.js
+++ b/src/patchEson.js
@@ -162,7 +162,6 @@ export function replace (data, path, value) {
  * @param {Path} path
  * @return {{data: ESON, revert: ESONPatch}}
  */
-// FIXME: path should be a path instead of a string? (all functions in patchEson)
 export function remove (data, path) {
   // console.log('remove', path)
 
@@ -215,9 +214,7 @@ export function remove (data, path) {
  * @return {{data: ESON, revert: ESONPatch}}
  * @private
  */
-// TODO: refactor path to an array with strings
 export function add (data, path, value, options) {
-  // FIXME: apply id to new created values
   const parentPath = initial(path)
   const parent = getIn(data, parentPath)
   const resolvedPath = resolvePathIndex(data, path)
@@ -312,7 +309,6 @@ export function move (data, path, from, options) {
 
   const result1 = remove(data, from)
   const result2 = add(result1.data, path, dataValue, options)
-  // FIXME: passing id as parameter is ugly, make that redundant (use replace instead of remove/add? (that would give less predictive output :( ))
 
   const before = result1.revert[0].meta.before
   const beforeNeeded = (parent[META].type === 'Object' && before)
diff --git a/src/types.js b/src/types.js
index 455f47d..826040b 100644
--- a/src/types.js
+++ b/src/types.js
@@ -8,7 +8,7 @@
  *   modes: string[]?,
  *   history: boolean?,
  *   indentation: number | string?,
- *   onChange: function (patch: JSONPatch, revert: JSONPatch)?,
+ *   onChange: function (patch: ESONPatch, revert: ESONPatch)?,
  *   onChangeText: function ()?,
  *   onChangeMode: function (mode: string, prevMode: string)?,
  *   onError:  function (err: Error)?,
@@ -41,22 +41,10 @@ export type JSONArrayType = JSONType[]
 export type SearchResultStatus = 'normal' | 'active'
 export type ESONPointerArea = 'value' | 'property'
 
-export type ESONObjectProperty = {
-  id: number,
-  name: string,
-  value: ESON,
-  searchResult?: SearchResultStatus
-}
-
-export type ESONArrayItem = {
-  id: number,
-  value: ESON
-}
-
 export type ESONObject = {
   _meta: {
     type: 'Object',
-    path: JSONPath,
+    path: Path,
     expanded?: boolean,
     selected?: boolean,
     searchProperty?: SearchResultStatus,
@@ -67,7 +55,7 @@ export type ESONObject = {
 export type ESONArray = {
   _meta: {
     type: 'Array',
-    path: JSONPath,
+    path: Path,
     length: number
     expanded?: boolean,
     selected?: boolean,
@@ -79,7 +67,7 @@ export type ESONArray = {
 export type ESONValue = {
   _meta: {
     type: 'value' | 'string',
-    path: JSONPath,
+    path: Path,
     value: null | boolean | string | number,
     selected?: boolean,
     searchProperty?: SearchResultStatus,
@@ -91,28 +79,18 @@ export type ESON = ESONObject | ESONArray | ESONValue
 
 export type ESONType = 'Object' | 'Array' | 'value' | 'string'
 
-export type Path = string[]  // TODO: Path must become redundant, replace with JSONPath or ESONPath everywhere
-export type JSONPath = string[]
-export type ESONPath = string[]
+export type Path = string[]
 
 export type ESONPointer = {
-  path: JSONPath, // TODO: change path to an ESONPath?
+  path: Path,
   area?: ESONPointerArea
 }
 
 export type Selection = {
-  start?: JSONPath,
-  end?: JSONPath,
-  before?: JSONPath,
-  after?: JSONPath
-}
-
-// TODO: ESONPointer.path is an array, JSONSchemaError.path is a string -> make this consistent
-
-
-// TODO: remove SetOptions, merge into Options (everywhere in the public API)
-export type SetOptions = {
-  expand?: (path: Path) => boolean
+  start?: Path,
+  end?: Path,
+  before?: Path,
+  after?: Path
 }
 
 export type ESONPatchAction = {
@@ -120,7 +98,7 @@ export type ESONPatchAction = {
   path: string,
   from?: string,
   value?: any,
-  jsoneditor?: ESONPatchOptions
+  meta?: ESONPatchOptions
 }
 export type ESONPatch = ESONPatchAction[]
 
@@ -129,13 +107,8 @@ export type ESONPatchOptions = {
   expand: (Path) => boolean
 }
 
-export type ESONPatchResult = {
-  patch: ESONPatch,
-  revert: ESONPatch,
-  error: null | Error
-}
-
+// TODO: ESONPointer.path is an array, JSONSchemaError.path is a string -> make this consistent
 export type JSONSchemaError = {
-  dataPath: string, // TODO: change type to JSONPath
+  dataPath: string, // TODO: change type to Path
   message: string
 }