diff --git a/.babelrc b/.babelrc
index 603209a..c3c66da 100644
--- a/.babelrc
+++ b/.babelrc
@@ -1,4 +1,36 @@
 {
-  "presets": ["env", "stage-1"],
-  "plugins": ["transform-class-properties"]
+  "ignore": [
+    "./test/dict"
+  ],
+  "presets": [
+    "@babel/preset-env"
+  ],
+  "plugins": [
+    "@babel/plugin-proposal-class-properties",
+    "babel-plugin-dynamic-import-node",
+    "@babel/plugin-syntax-dynamic-import",
+    "@babel/plugin-syntax-import-meta",
+    "@babel/plugin-proposal-json-strings",
+    [
+      "@babel/plugin-proposal-decorators",
+      {
+        "legacy": true
+      }
+    ],
+    "@babel/plugin-proposal-function-sent",
+    "@babel/plugin-proposal-export-namespace-from",
+    "@babel/plugin-proposal-numeric-separator",
+    "@babel/plugin-proposal-throw-expressions",
+    "@babel/plugin-proposal-export-default-from",
+    "@babel/plugin-proposal-logical-assignment-operators",
+    "@babel/plugin-proposal-optional-chaining",
+    [
+      "@babel/plugin-proposal-pipeline-operator",
+      {
+        "proposal": "minimal"
+      }
+    ],
+    "@babel/plugin-proposal-nullish-coalescing-operator",
+    "@babel/plugin-proposal-do-expressions"
+  ]
 }
diff --git a/package-lock.json b/package-lock.json
index 400aaeb..6f5f39f 100755
--- a/package-lock.json
+++ b/package-lock.json
@@ -4,6 +4,1172 @@
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   "requires": true,
   "dependencies": {
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+      "dev": true,
+      "requires": {
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+      }
+    },
+    "@babel/core": {
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+      "resolved": "https://registry.npmjs.org/@babel/core/-/core-7.1.2.tgz",
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+      "dev": true,
+      "requires": {
+        "@babel/code-frame": "^7.0.0",
+        "@babel/generator": "^7.1.2",
+        "@babel/helpers": "^7.1.2",
+        "@babel/parser": "^7.1.2",
+        "@babel/template": "^7.1.2",
+        "@babel/traverse": "^7.1.0",
+        "@babel/types": "^7.1.2",
+        "convert-source-map": "^1.1.0",
+        "debug": "^3.1.0",
+        "json5": "^0.5.0",
+        "lodash": "^4.17.10",
+        "resolve": "^1.3.2",
+        "semver": "^5.4.1",
+        "source-map": "^0.5.0"
+      }
+    },
+    "@babel/generator": {
+      "version": "7.1.3",
+      "resolved": "https://registry.npmjs.org/@babel/generator/-/generator-7.1.3.tgz",
+      "integrity": "sha512-ZoCZGcfIJFJuZBqxcY9OjC1KW2lWK64qrX1o4UYL3yshVhwKFYgzpWZ0vvtGMNJdTlvkw0W+HR1VnYN8q3QPFQ==",
+      "dev": true,
+      "requires": {
+        "@babel/types": "^7.1.3",
+        "jsesc": "^2.5.1",
+        "lodash": "^4.17.10",
+        "source-map": "^0.5.0",
+        "trim-right": "^1.0.1"
+      },
+      "dependencies": {
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+          "version": "2.5.1",
+          "resolved": "https://registry.npmjs.org/jsesc/-/jsesc-2.5.1.tgz",
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     "safe-buffer": {
@@ -1329,12 +1779,6 @@
       "integrity": "sha512-RS9R6R35NYgQn++fkDWaOmqGoj4Ek9gGs+DPxNUZKuwE183xjJroKvyo1IzVFeXvUrvmALy6FWD5xrdJT25gMg==",
       "dev": true
     },
-    "slash": {
-      "version": "1.0.0",
-      "resolved": "https://registry.npmjs.org/slash/-/slash-1.0.0.tgz",
-      "integrity": "sha1-xB8vbDn8FtHNF61LXYlhFK5HDVU=",
-      "dev": true
-    },
     "source-map": {
       "version": "0.5.7",
       "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.5.7.tgz",
@@ -1342,21 +1786,21 @@
       "dev": true
     },
     "source-map-support": {
-      "version": "0.4.18",
-      "resolved": "https://registry.npmjs.org/source-map-support/-/source-map-support-0.4.18.tgz",
-      "integrity": "sha512-try0/JqxPLF9nOjvSta7tVondkP5dwgyLDjVoyMDlmjugT2lRZ1OfsrYTkCd2hkDnJTKRbO/Rl3orm8vlsUzbA==",
+      "version": "0.5.9",
+      "resolved": "https://registry.npmjs.org/source-map-support/-/source-map-support-0.5.9.tgz",
+      "integrity": "sha512-gR6Rw4MvUlYy83vP0vxoVNzM6t8MUXqNuRsuBmBHQDu1Fh6X015FrLdgoDKcNdkwGubozq0P4N0Q37UyFVr1EA==",
       "dev": true,
       "requires": {
-        "source-map": "^0.5.6"
-      }
-    },
-    "strip-ansi": {
-      "version": "3.0.1",
-      "resolved": "http://registry.npmjs.org/strip-ansi/-/strip-ansi-3.0.1.tgz",
-      "integrity": "sha1-ajhfuIU9lS1f8F0Oiq+UJ43GPc8=",
-      "dev": true,
-      "requires": {
-        "ansi-regex": "^2.0.0"
+        "buffer-from": "^1.0.0",
+        "source-map": "^0.6.0"
+      },
+      "dependencies": {
+        "source-map": {
+          "version": "0.6.1",
+          "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.6.1.tgz",
+          "integrity": "sha512-UjgapumWlbMhkBgzT7Ykc5YXUT46F0iKu8SGXq0bcwP5dz/h0Plj6enJqjz1Zbq2l5WaqYnrVbwWOWMyF3F47g==",
+          "dev": true
+        }
       }
     },
     "supports-color": {
@@ -1409,12 +1853,6 @@
         "thenify": ">= 3.1.0 < 4"
       }
     },
-    "to-fast-properties": {
-      "version": "1.0.3",
-      "resolved": "https://registry.npmjs.org/to-fast-properties/-/to-fast-properties-1.0.3.tgz",
-      "integrity": "sha1-uDVx+k2MJbguIxsG46MFXeTKGkc=",
-      "dev": true
-    },
     "trim-right": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/trim-right/-/trim-right-1.0.1.tgz",
@@ -1432,6 +1870,34 @@
       "resolved": "https://registry.npmjs.org/underscore/-/underscore-1.9.1.tgz",
       "integrity": "sha512-5/4etnCkd9c8gwgowi5/om/mYO5ajCaOgdzj/oW+0eQV9WxKBDZw5+ycmKmeaTXjInS/W0BzpGLo2xR2aBwZdg=="
     },
+    "unicode-canonical-property-names-ecmascript": {
+      "version": "1.0.4",
+      "resolved": "https://registry.npmjs.org/unicode-canonical-property-names-ecmascript/-/unicode-canonical-property-names-ecmascript-1.0.4.tgz",
+      "integrity": "sha512-jDrNnXWHd4oHiTZnx/ZG7gtUTVp+gCcTTKr8L0HjlwphROEW3+Him+IpvC+xcJEFegapiMZyZe02CyuOnRmbnQ==",
+      "dev": true
+    },
+    "unicode-match-property-ecmascript": {
+      "version": "1.0.4",
+      "resolved": "https://registry.npmjs.org/unicode-match-property-ecmascript/-/unicode-match-property-ecmascript-1.0.4.tgz",
+      "integrity": "sha512-L4Qoh15vTfntsn4P1zqnHulG0LdXgjSO035fEpdtp6YxXhMT51Q6vgM5lYdG/5X3MjS+k/Y9Xw4SFCY9IkR0rg==",
+      "dev": true,
+      "requires": {
+        "unicode-canonical-property-names-ecmascript": "^1.0.4",
+        "unicode-property-aliases-ecmascript": "^1.0.4"
+      }
+    },
+    "unicode-match-property-value-ecmascript": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/unicode-match-property-value-ecmascript/-/unicode-match-property-value-ecmascript-1.0.2.tgz",
+      "integrity": "sha512-Rx7yODZC1L/T8XKo/2kNzVAQaRE88AaMvI1EF/Xnj3GW2wzN6fop9DDWuFAKUVFH7vozkz26DzP0qyWLKLIVPQ==",
+      "dev": true
+    },
+    "unicode-property-aliases-ecmascript": {
+      "version": "1.0.4",
+      "resolved": "https://registry.npmjs.org/unicode-property-aliases-ecmascript/-/unicode-property-aliases-ecmascript-1.0.4.tgz",
+      "integrity": "sha512-2WSLa6OdYd2ng8oqiGIWnJqyFArvhn+5vgx5GTxMbUYjCYKUcuKS62YLFF0R/BDGlB1yzXjQOLtPAfHsgirEpg==",
+      "dev": true
+    },
     "wordnet-db": {
       "version": "3.1.6",
       "resolved": "https://registry.npmjs.org/wordnet-db/-/wordnet-db-3.1.6.tgz",
diff --git a/package.json b/package.json
index 60c50be..2dcd975 100755
--- a/package.json
+++ b/package.json
@@ -29,15 +29,30 @@
   "bin": "./bin/wordpos-cli.js",
   "dependencies": {
     "commander": "^2.0.0",
+    "symlink-dir": "1.1.3",
     "underscore": ">=1.3.1",
-    "wordnet-db": "^3.1.6",
-    "symlink-dir": "1.1.3"
+    "wordnet-db": "^3.1.6"
   },
   "devDependencies": {
-    "babel-core": "^6.26.3",
-    "babel-plugin-transform-class-properties": "^6.24.1",
-    "babel-preset-env": "^1.7.0",
-    "babel-preset-stage-2": "^6.24.1",
+    "@babel/core": "^7.0.0",
+    "@babel/plugin-proposal-class-properties": "^7.0.0",
+    "@babel/plugin-proposal-decorators": "^7.0.0",
+    "@babel/plugin-proposal-do-expressions": "^7.0.0",
+    "@babel/plugin-proposal-export-default-from": "^7.0.0",
+    "@babel/plugin-proposal-export-namespace-from": "^7.0.0",
+    "@babel/plugin-proposal-function-sent": "^7.0.0",
+    "@babel/plugin-proposal-json-strings": "^7.0.0",
+    "@babel/plugin-proposal-logical-assignment-operators": "^7.0.0",
+    "@babel/plugin-proposal-nullish-coalescing-operator": "^7.0.0",
+    "@babel/plugin-proposal-numeric-separator": "^7.0.0",
+    "@babel/plugin-proposal-optional-chaining": "^7.0.0",
+    "@babel/plugin-proposal-pipeline-operator": "^7.0.0",
+    "@babel/plugin-proposal-throw-expressions": "^7.0.0",
+    "@babel/plugin-syntax-dynamic-import": "^7.0.0",
+    "@babel/plugin-syntax-import-meta": "^7.0.0",
+    "@babel/preset-env": "^7.0.0",
+    "@babel/register": "^7.0.0",
+    "babel-plugin-dynamic-import-node": "^2.2.0",
     "chai": "^4.0.2",
     "mini-bench": "^1.0.0",
     "mocha": "^5.2.0"
@@ -52,14 +67,12 @@
     "postinstall": "npm run postinstall-web && npm run postinstall-node",
     "postinstall-node": "node tools/stat.js --no-stats index.adv index.adj index.verb index.noun",
     "postinstall-web": "node scripts/makeJsonDict.js index data",
-
     "build": "parcel build --detailed-report -o wordpos.min.js --global WordPOS -t browser src/browser/index.js",
-    "test": "mocha test",
-    "test-browser": "mocha test- # TODO",
-
+    "test": "npm run test-node && npm run test-browser",
+    "test-node": "mocha test",
+    "test-browser": "mocha test/wordpos_test --require @babel/register",
     "prestart": "symlink-dir dict samples/self-hosted/dict",
     "start": "npm run build && http-server",
-
     "prestart-dev": "rm -rf build && mkdir build && symlink-dir dict build/dict && cp samples/self-hosted/main.js build/main.txt",
     "start-dev": "npm run start-self -- -d build",
     "start-self": "parcel samples/self-hosted/index.html",
diff --git a/scripts/makeJsonDict.js b/scripts/makeJsonDict.js
index cabbedb..f81ebd0 100644
--- a/scripts/makeJsonDict.js
+++ b/scripts/makeJsonDict.js
@@ -9,6 +9,7 @@ let fs = require('fs');
 let path = require('path');
 
 let outPath = './dict';
+let testPath = './test/dict';
 let posExt = ['adj', 'adv', 'noun', 'verb'];
 let dictRoot = './node_modules/wordnet-db/dict/';
 const fileTypes = {
@@ -30,11 +31,16 @@ function uniq(arr) {
 console.time('Done');
 
 // create out directory
-try {
-  fs.statSync(outPath);
-} catch (e) {
-  fs.mkdirSync(outPath);
-}
+const ensurePath = (path) => {
+  try {
+    fs.statSync(path);
+  } catch (e) {
+    fs.mkdirSync(path);
+  }
+};
+
+ensurePath(outPath);
+ensurePath(testPath);
 
 function processFile(name) {
 
@@ -66,8 +72,13 @@ function processFile(name) {
   function writeFile(pos, obj) {
     console.time('  write');
     let text = JSON.stringify(obj);
-    text = 'export default ' + text;
-    fs.writeFileSync(path.resolve(outPath, name + '.' + pos + '.js'), text);
+    fs.writeFileSync(path.resolve(outPath, name + '.' + pos + '.js'),
+      'export default ' + text);
+
+    // also write for mocha tests
+    fs.writeFileSync(path.resolve(testPath, name + '.' + pos + '.js'),
+      'module.exports.default = ' + text);
+
     console.timeEnd('  write');
   }
 
diff --git a/src/browser/baseFile.js b/src/browser/baseFile.js
index ada200e..64d4b49 100644
--- a/src/browser/baseFile.js
+++ b/src/browser/baseFile.js
@@ -23,8 +23,12 @@ class BaseFile {
 
   load() {
     if (this.loadError) return Promise.reject(this.loadError);
-    return import(this.filePath)
-      .then(exports => this.file = exports.default)
+    let promise = Promise.resolve(require(this.filePath));
+
+    return promise
+      .then(exports => {
+        this.file = exports.default
+      })
       .catch(err => {
         console.error(`Error loading "${this.type}" file ${this.filePath}.`, err);
         this.loadError = err;
@@ -37,4 +41,5 @@ class BaseFile {
   }
 }
 
-export default BaseFile;
+// export default BaseFile;
+module.exports = BaseFile;
diff --git a/src/browser/dataFile.js b/src/browser/dataFile.js
index 467168b..ec48a32 100644
--- a/src/browser/dataFile.js
+++ b/src/browser/dataFile.js
@@ -9,8 +9,9 @@
  * Released under MIT license
  */
 
-import { lineDataToJSON, LEX_NAMES } from '../common';
-import BaseFile from './baseFile';
+const { lineDataToJSON, LEX_NAMES } = require('../common');
+const { zeroPad } = require('../util');
+const BaseFile = require('./baseFile');
 
 /**
  * get parsed line from data file
@@ -43,7 +44,10 @@ function lookup(offsets, callback) {
 
   if (single) offsets = [offsets];
   return new Promise(function(resolve, reject) {
-    results = offsets.map(readLine).filter(valid);
+    results = offsets
+      .map(zeroPad)
+      .map(readLine)
+      .filter(valid);
 
     if (!results.length) {
       let err = new RangeError(`No data at offsets ${offsets.join()} in ${self.filePath}.`);
@@ -83,4 +87,4 @@ class DataFile extends BaseFile {
  */
 DataFile.LEX_NAMES = LEX_NAMES;
 
-export default DataFile;
+module.exports = DataFile;
diff --git a/src/browser/index.js b/src/browser/index.js
index b059fa4..f0edce0 100644
--- a/src/browser/index.js
+++ b/src/browser/index.js
@@ -7,12 +7,10 @@
 * Released under MIT license
 */
 
-import { stopwords, prepText, makeStopwordString } from '../util';
-import { is, get, lookup, seek } from '../common';
-import IndexFile from './indexFile';
-import DataFile from './dataFile';
-
-console.log(4545, ' borwser index')
+const { stopwords, prepText, makeStopwordString } = require('../util');
+const { is, get, getPOS, lookup, seek, lookupPOS } = require('../common');
+const IndexFile = require('./indexFile');
+const DataFile = require('./dataFile');
 
 const POS = {
   n: 'noun',
@@ -105,6 +103,7 @@ class WordPOS {
    * getX() - Find all words in string that are given POS
    * @see get
    */
+  getPOS = getPOS;
   getAdjectives = get('isAdjective');
   getAdverbs = get('isAdverb');
   getNouns = get('isNoun');
@@ -114,6 +113,7 @@ class WordPOS {
    * lookupX() - Lookup word definition if already know POS
    * @see lookup
    */
+  lookup = lookupPOS;
   lookupAdjective = lookup('a');
   lookupAdverb = lookup('r');
   lookupNoun = lookup('n');
@@ -159,7 +159,6 @@ WordPOS.defaults = {
 
 };
 
-
 /**
  * access to WordNet DB
  * @type {object}
diff --git a/src/browser/indexFile.js b/src/browser/indexFile.js
index 9dc186e..898b732 100644
--- a/src/browser/indexFile.js
+++ b/src/browser/indexFile.js
@@ -7,8 +7,8 @@
  * Released under MIT license
  */
 
-import { indexLookup } from '../common';
-import BaseFile from './baseFile';
+const { indexLookup } = require('../common');
+const BaseFile = require('./baseFile');
 
 /**
  * find a search term in an index file (using fast index)
@@ -64,4 +64,4 @@ class IndexFile extends BaseFile {
   }
 }
 
-export default IndexFile;
+module.exports = IndexFile;
diff --git a/src/common.js b/src/common.js
index 004ee8a..30bd273 100644
--- a/src/common.js
+++ b/src/common.js
@@ -9,10 +9,10 @@
 * Released under MIT license
 */
 
-var { normalize, nextTick, isString } = require('./util');
+var { normalize, nextTick, isString, uniq, diff, flat } = require('./util');
 
 function error(err, callback) {
-  if (isString(err)) err = new Error(err);
+  if (isString(err)) err = new RangeError(err);
   callback && callback(err, {});
   return Promise.reject(err);
 }
@@ -105,6 +105,47 @@ function indexLookup(word, callback) {
   });
 }
 
+/**
+ * lookup a word in all indexes
+ *
+ * @param word {string} - search word
+ * @param callback {Function} (optional) - callback with (results, word) signature
+ * @returns {Promise}
+ * @this WordPOS
+ */
+function lookupPOS(word, callback) {
+  var self = this,
+    results = [],
+    profile = this.options.profile,
+    start = profile && new Date(),
+    methods = ['lookupAdverb', 'lookupAdjective', 'lookupVerb', 'lookupNoun'];
+
+  return Promise
+    .all(methods.map(exec))
+    .then(done)
+    .catch(error);
+
+  function exec(method) {
+    return self[ method ]
+      .call(self, word)
+      .then(function collect(result){
+        results = results.concat(result);
+      });
+  }
+
+  function done() {
+    var args = [results, word];
+    profile && args.push(new Date() - start);
+    nextTick(callback, args);
+    return results;
+  }
+
+  function error(err) {
+    nextTick(callback, [[], word]);
+    throw err;
+  }
+}
+
 /**
  * getX() factory function
  *
@@ -127,7 +168,7 @@ function get(isFn) {
       .then(() => Promise.all(words.map(exec)))
       .then(done)
       .catch(err => {
-        done(); // callback signature is same!
+        // done(); // callback signature is same!  // FIXME
         return Promise.reject(err);
       });
 
@@ -148,6 +189,53 @@ function get(isFn) {
   };
 }
 
+/**
+ * getPOS() - Find all POS for all words in given string
+ *
+ * @param text {string} - words to lookup for POS
+ * @param callback {function} (optional) - receives object with words broken into POS or 'rest', ie,
+ * 	    Object: {nouns:[], verbs:[], adjectives:[], adverbs:[], rest:[]}
+ * @return Promise - resolve function receives data object
+ */
+function getPOS(text, callback) {
+  var self = this,
+    data = {nouns:[], verbs:[], adjectives:[], adverbs:[], rest:[]},
+    profile = this.options.profile,
+    start = profile && new Date(),
+    words = this.parse(text),
+    methods = ['getAdverbs', 'getAdjectives', 'getVerbs', 'getNouns'];
+
+  return Promise
+    .all(methods.map(exec))
+    .then(done)
+    .catch(error);
+
+  function exec(method) {
+    return self[ method ]
+      .call(self, text, null, true)
+      .then(function collect(results) {
+        // getAdjectives --> adjectives
+        var pos = method.replace('get','').toLowerCase();
+        data[ pos ] =  results;
+      });
+  }
+
+  function done() {
+    var args = [data];
+    var matches = uniq(flat(Object.values(data)));
+    data.rest = diff(words, matches);
+
+    profile && args.push(new Date() - start);
+    nextTick(callback, args);
+    return data;
+  }
+
+  function error(err) {
+    nextTick(callback, []);
+    throw err;
+  }
+}
+
 /**
  * isX() factory function
  *
@@ -253,6 +341,35 @@ function seek(offset, pos, callback){
   return data.lookup(offset, callback);
 }
 
+/**
+ * factory function for randX()
+ *
+ * @param pos {string} - a,r,n,v
+ * @returns {Function} - rand function bound to an index file
+ * @this WordPOS
+ */
+function makeRandX(pos){
+  return function(opts, callback, _noprofile) {
+    // disable profiling when isX() used internally
+    var profile = this.options.profile && !_noprofile,
+      start = profile && new Date(),
+      args = [],
+      index = this.getFilesFor(pos).index,
+      startsWith = opts && opts.startsWith || '',
+      count = opts && opts.count || 1;
+
+    if (typeof opts === 'function') {
+      callback = opts;
+    }
+
+    return index.rand(startsWith, count, function (record) {
+      args.push(record, startsWith);
+      profile && args.push(new Date() - start);
+      callback && callback.apply(null, args);
+    });
+  };
+}
+
 const LEX_NAMES = [
  'adj.all',
  'adj.pert',
@@ -306,8 +423,11 @@ module.exports= {
   is,
   get,
   seek,
+  getPOS,
+  makeRandX,
 
   lineDataToJSON,
   LEX_NAMES,
-  lookup
+  lookup,
+  lookupPOS
 }
diff --git a/src/node/dataFile.js b/src/node/dataFile.js
index 688df13..b5d722b 100644
--- a/src/node/dataFile.js
+++ b/src/node/dataFile.js
@@ -12,6 +12,7 @@
 var fs = require('fs'),
   path = require('path'),
   _ = require('underscore'),
+  { zeroPad } = require('../util'),
   {
     lineDataToJSON,
     LEX_NAMES
@@ -24,9 +25,7 @@ var fs = require('fs'),
  * @return {boolean} true if line data is good
  */
 function dataCheck(line, location) {
-  var pad = '00000000', // 8 zeros
-    padded = String(pad + location).slice( - pad.length);
-  return line.indexOf(padded) === 0;
+  return line.indexOf(zeroPad(location)) === 0;
 }
 
 /**
@@ -52,13 +51,13 @@ function readLocation(location, callback) {
       return;
     }
     //console.log('  read %d bytes at <%d>', count, location);
-    if (!dataCheck(str, location)) return callback(new Error('Bad data at location ' + location));
+    if (!dataCheck(str, location)) return callback(new RangeError('No data at offset ' + location));
 
     callback(null, lineDataToJSON(str, location));
   });
 
   function readChunk(pos, cb) {
-    var nonDataErr = new Error('no data at offset ' + pos);
+    var nonDataErr = new RangeError('No data at offset ' + pos);
 
     fs.read(file.fd, buffer, 0, len, pos, function (err, count) {
       if (!count) return cb(nonDataErr, count);
diff --git a/src/node/index.js b/src/node/index.js
index ceea30b..a15182a 100644
--- a/src/node/index.js
+++ b/src/node/index.js
@@ -27,8 +27,10 @@ var
   {
     is,
     get,
+    getPOS,
     seek,
-    lookup
+    lookup,
+    lookupPOS
   } = require('../common');
 
 stopwordsStr = makeStopwordString(stopwords);
@@ -58,7 +60,7 @@ var WordPOS = function(options) {
   this.advData = new DataFile(dictPath, 'adv');
 
   // define randX() functions
-  require('../rand').init(this);  // FIXME
+  require('../rand').init(this);
 
   if (_.isArray(this.options.stopwords)) {
     this.options.stopwords = makeStopwordString(this.options.stopwords);
@@ -94,39 +96,7 @@ var wordposProto = WordPOS.prototype;
  * @param callback {Function} (optional) - callback with (results, word) signature
  * @returns {Promise}
  */
-wordposProto.lookup = function(word, callback) {
-  var self = this,
-    results = [],
-    profile = this.options.profile,
-    start = profile && new Date(),
-    methods = ['lookupAdverb', 'lookupAdjective', 'lookupVerb', 'lookupNoun'];
-
-  return Promise
-    .all(methods.map(exec))
-    .then(done)
-    .catch(error);
-
-  function exec(method) {
-    return self[ method ]
-      .call(self, word)
-      .then(function collect(result){
-        results = results.concat(result);
-      });
-  }
-
-  function done() {
-    var args = [results, word];
-    profile && args.push(new Date() - start);
-    nextTick(callback, args);
-    return results;
-  }
-
-  function error(err) {
-    nextTick(callback, [[], word]);
-    throw err;
-  }
-};
-
+wordposProto.lookup = lookupPOS;
 
 /**
  * getPOS() - Find all POS for all words in given string
@@ -136,49 +106,7 @@ wordposProto.lookup = function(word, callback) {
  * 	    Object: {nouns:[], verbs:[], adjectives:[], adverbs:[], rest:[]}
  * @return Promise - resolve function receives data object
  */
-wordposProto.getPOS = function(text, callback) {
-  var self = this,
-    data = {nouns:[], verbs:[], adjectives:[], adverbs:[], rest:[]},
-    profile = this.options.profile,
-    start = profile && new Date(),
-    words = this.parse(text),
-    methods = ['getAdverbs', 'getAdjectives', 'getVerbs', 'getNouns'];
-
-  return Promise
-    .all(methods.map(exec))
-    .then(done)
-    .catch(error);
-
-  function exec(method) {
-    return self[ method ]
-      .call(self, text, null, true)
-      .then(function collect(results) {
-        // getAdjectives --> adjectives
-        var pos = method.replace('get','').toLowerCase();
-        data[ pos ] =  results;
-      });
-  }
-
-  function done() {
-    var matches = _(data).chain()
-      .values()
-      .flatten()
-      .uniq()
-      .value(),
-      args = [data];
-
-    data.rest =  _(words).difference(matches);
-
-    profile && args.push(new Date() - start);
-    nextTick(callback, args);
-    return data;
-  }
-
-  function error(err) {
-    nextTick(callback, []);
-    throw err;
-  }
-};
+wordposProto.getPOS = getPOS;
 
 /**
  * get index and data files for given pos
diff --git a/src/rand.js b/src/rand.js
index 81d57dd..9c7b2fe 100644
--- a/src/rand.js
+++ b/src/rand.js
@@ -12,45 +12,11 @@
 var _ = require('underscore')._,
   util = require('util'),
   Trie = require('../lib/natural/trie/trie'),
-
-
-// FIXME
-  IndexFile = require('./node/indexFile'),
-
-
-
-
+  indexPath = process.browser ? 'browser' : 'node',
+  IndexFile = require(`./${indexPath}/indexFile`),
   KEY_LENGTH = 3;
 
 
-/**
- * factory function for randX()
- *
- * @param pos {string} - a,r,n,v
- * @returns {Function} - rand function bound to an index file
- */
-function makeRandX(pos){
-  return function(opts, callback, _noprofile) {
-    // disable profiling when isX() used internally
-    var profile = this.options.profile && !_noprofile,
-      start = profile && new Date(),
-      args = [],
-      index = this.getFilesFor(pos).index,
-      startsWith = opts && opts.startsWith || '',
-      count = opts && opts.count || 1;
-
-    if (typeof opts === 'function') {
-      callback = opts;
-    }
-
-    return index.rand(startsWith, count, function (record) {
-      args.push(record, startsWith);
-      profile && args.push(new Date() - start);
-      callback && callback.apply(null, args);
-    });
-  };
-}
-
 /**
  * rand function (bound to index)
  *
@@ -58,6 +24,7 @@ function makeRandX(pos){
  * @param num {number} - number of words to return
  * @param callback {function} - callback function, receives words array and startsWith
  * @returns Promise
+ * @this IndexFile
  */
 function rand(startsWith, num, callback){
   var self = this,
diff --git a/src/util.js b/src/util.js
index 0820c73..b75d76a 100644
--- a/src/util.js
+++ b/src/util.js
@@ -22,6 +22,12 @@ function nextTick(fn, args) {
   }
 }
 
+// offsets must be zero-padded to 8 chars
+function zeroPad(str) {
+  var pad = '00000000'; // 8 zeros
+  return String(pad + str).slice(-pad.length);
+}
+
 function normalize(word) {
   return word.toLowerCase().replace(/\s+/g, '_');
 }
@@ -38,6 +44,15 @@ function uniq(arr) {
   return arr.filter((v, i) => arr.indexOf(v) === i);
 }
 
+function diff(arr, subArr) {
+  return arr.filter(x => !subArr.includes(x));
+}
+
+// flatten an array - 1-deep only!
+function flat(arr) {
+  return [].concat.apply([], arr);
+}
+
 function isString(s) {
   return typeof s === 'string';
 }
@@ -57,10 +72,14 @@ function prepText(text) {
 
 module.exports = {
   isString,
+  zeroPad,
   stopwords,
   nextTick,
   normalize,
   tokenizer,
   prepText,
-  makeStopwordString
+  makeStopwordString,
+  uniq,
+  diff,
+  flat
 };
diff --git a/src/wordpos.js b/src/wordpos.js
index b597902..e1a974e 100644
--- a/src/wordpos.js
+++ b/src/wordpos.js
@@ -9,9 +9,7 @@
 * Released under MIT license
 */
 
-console.log(333, process.browser);
-
-if (11 || process.browser) {
+if (process.browser) {
   module.exports = require('./browser');
 } else {
   module.exports = require('./node');
diff --git a/test/wordpos_test.js b/test/wordpos_test.js
index 96756e6..49b1679 100644
--- a/test/wordpos_test.js
+++ b/test/wordpos_test.js
@@ -23,9 +23,27 @@ var
   chai = require('chai'),
   _ = require('underscore'),
   assert = chai.assert,
+  browser = process.browser = process.argv.includes('@babel/register'),
   WordPOS = require('../src/wordpos'),
-  wordpos = new WordPOS({profile: false});
+  path = require('path'),
+  dictPath = browser ? path.resolve('./test/dict') : undefined,
+  wordpos = new WordPOS({
+    profile: false,
+    dictPath: dictPath
+  });
 
+const assertNoData = (err) => {
+  assert(err instanceof RangeError);
+  assert(/No data at offset/.test(err.message));
+};
+
+const assertOffsetErr = (err) => {
+  assert(err instanceof RangeError);
+  assert.equal(err.message, 'Offset must be valid positive number: foobar');
+};
+
+
+console.log('Running', browser ? 'browser' : 'node', 'tests');
 chai.config.showDiff = true;
 
 var str = "The angry bear chased the frightened little squirrel",
@@ -42,23 +60,22 @@ var str = "The angry bear chased the frightened little squirrel",
 
 
 describe('lookup', function() {
-  it('with callback', function (done) {
-    wordpos.lookup('hegemony', function (result) {
+
+  it('with callback', function () {
+    return wordpos.lookup('hegemony', function (result) {
       assert.equal(result.length, 1);
       assert.equal(result[0].pos, 'n');
       assert.equal(result[0].lemma, 'hegemony');
       assert.equal(result[0].synonyms.length, 1);
-      done();
     });
   });
 
-  it('with Promise', function (done) {
-    wordpos.lookup('hegemony').then(function (result) {
+  it('with Promise', function () {
+    return wordpos.lookup('hegemony').then(function (result) {
       assert.equal(result.length, 1);
       assert.equal(result[0].pos, 'n');
       assert.equal(result[0].lemma, 'hegemony');
       assert.equal(result[0].synonyms.length, 1);
-      done();
     });
   });
 });
@@ -83,42 +100,38 @@ describe('options passed to constructor', function() {
 
 
 describe('getX()...', function() {
-  it('should get all POS', function(done) {
-    wordpos.getPOS(str, function(result) {
+
+  it('should get all POS', function() {
+    return wordpos.getPOS(str, function(result) {
       assert.sameMembers(result.nouns, expected.nouns);
       assert.sameMembers(result.verbs, expected.verbs);
       assert.sameMembers(result.adjectives, expected.adjectives);
       assert.sameMembers(result.adverbs, expected.adverbs);
       assert.sameMembers(result.rest, expected.rest);
-      done();
     });
   });
 
-  it.only('should get nouns', function(done) {
-    wordpos.getNouns('foot bar', function(result) {
+  it('should get nouns', function() {
+    return wordpos.getNouns(str, function(result) {
       assert.sameMembers(result, expected.nouns);
-      done();
     });
   });
 
-  it('should get verbs', function(done) {
-    wordpos.getVerbs(str, function(result) {
+  it('should get verbs', function() {
+    return wordpos.getVerbs(str, function(result) {
       assert.sameMembers(result, expected.verbs);
-      done();
     });
   });
 
-  it('should get adjectives', function(done) {
-    wordpos.getAdjectives(str, function(result) {
+  it('should get adjectives', function() {
+    return wordpos.getAdjectives(str, function(result) {
       assert.sameMembers(result, expected.adjectives);
-      done();
     });
   });
 
-  it('should get adverbs', function(done) {
-    wordpos.getAdverbs(str, function(result) {
+  it('should get adverbs', function() {
+    return wordpos.getAdverbs(str, function(result) {
       assert.sameMembers(result, expected.adverbs);
-      done();
     });
   });
 });
@@ -223,7 +236,7 @@ describe('lookupX()...', function() {
 
 
 describe('profile option', function() {
-  var wp = new WordPOS({profile : true});
+  var wp = new WordPOS({profile : true, dictPath: dictPath});
 
   it('should return time argument for isX()', function(done){
     wp.isNoun(garble, function(result, word, time) {
@@ -248,7 +261,7 @@ describe('profile option', function() {
   });
 
   it('should disable stopword filtering', function(done){
-    var wp = new WordPOS({stopwords : false}),
+    var wp = new WordPOS({stopwords : false, dictPath: dictPath}),
       strWithStopwords = 'about after all';  // 3 adjective stopwords
     wp.getAdjectives(strWithStopwords, function(result){
       assert.equal(result.length, 3);
@@ -257,7 +270,7 @@ describe('profile option', function() {
   });
 
   it('should use custom stopwords', function(done){
-    var wp = new WordPOS({stopwords : ['all']}),
+    var wp = new WordPOS({stopwords : ['all'], dictPath: dictPath}),
       strWithStopwords = 'about after all';  // 3 adjective stopwords
     // 'all' should be filtered
     wp.getAdjectives(strWithStopwords, function(result){
@@ -269,7 +282,7 @@ describe('profile option', function() {
 
 
 describe('nested callbacks on same index key', function() {
-  var wp = new WordPOS(),
+  var wp = new WordPOS({dictPath: dictPath}),
     word1 = 'head',
     word2 =  word1 + 'er';
 
@@ -360,56 +373,38 @@ describe('randX()...', function() {
 
 describe('seek()...', function() {
 
-  it('should seek offset', function(done) {
-    wordpos.seek(offset, 'a', function(err, result) {
+  it('should seek offset', function() {
+    return wordpos.seek(offset, 'a', function(err, result) {
       assert.equal(result.synsetOffset, offset);
       assert.equal(result.pos, 's');
       assert.equal(result.lemma, 'amazing');
-      done();
     });
   });
 
-  it('should handle bad offset', function(done) {
-      wordpos.seek('foobar', 'a', function(err, result){
-        assert(err instanceof Error);
-        assert.equal(err.message, 'Offset must be valid positive number: foobar');
-        done();
-      }).catch(_.noop); // UnhandledPromiseRejectionWarning
+  it('should handle bad offset', function() {
+    return wordpos.seek('foobar', 'a', assertOffsetErr).catch(assertOffsetErr);
   });
 
-  it('should handle wrong offset', function(done) {
-    var bad_offset = offset + 1;
-    wordpos.seek(bad_offset, 'a', function(err, result) {
-      assert(err instanceof Error);
-      assert.equal(err.message, 'Bad data at location ' + bad_offset);
-      assert.deepEqual(result, {});
-      done();
-    }).catch(_.noop); // UnhandledPromiseRejectionWarning;
+  it('should handle wrong offset', function() {
+    const bad_offset = offset + 1;
+    return wordpos.seek(bad_offset, 'a', assertNoData).catch(assertNoData);
   });
 
-  it('should handle very large offset', function(done) {
-    var bad_offset = offset + 100000000;
-    wordpos.seek(bad_offset, 'a', function(err, result) {
-      assert(err instanceof Error);
-      assert.equal(err.message, 'no data at offset ' + bad_offset);
-      assert.deepEqual(result, {});
-      done();
-    }).catch(_.noop); // UnhandledPromiseRejectionWarning;
+  it('should handle very large offset', function() {
+    const bad_offset = offset + 999999999;
+    return wordpos.seek(bad_offset, 'a', assertNoData).catch(assertNoData);
   });
 
-  it('should handle bad POS', function(done) {
-    wordpos.seek(offset, 'g', function(err, result) {
+  it('should handle bad POS', function() {
+    const assertErr = err => {
       assert(err instanceof Error);
       assert(/Incorrect POS/.test(err.message));
-      done();
-    }).catch(_.noop); // UnhandledPromiseRejectionWarning;
+    };
+    return wordpos.seek(offset, 'g', assertErr).catch(assertErr);
   });
 
-  it('should handle wrong POS', function(done) {
-    wordpos.seek(offset, 'v', function(err, result){
-      assert.equal(err.message, 'Bad data at location ' + offset);
-    }).catch(_.noop); // UnhandledPromiseRejectionWarning;
-    done();
+  it('should handle wrong POS', function() {
+    return wordpos.seek(offset, 'v', assertNoData).catch(assertNoData);
   });
 
 });
@@ -489,17 +484,11 @@ describe('Promise pattern', function() {
   });
 
   it('seek() - wrong offset', function () {
-    return wordpos.seek(offset + 1, 'a').catch(function (err) {
-      assert(err instanceof Error);
-      assert.equal(err.message, 'Bad data at location ' + (offset+1));
-    });
+    return wordpos.seek(offset + 1, 'a').catch(assertNoData);
   });
 
   it('seek() - bad offset', function () {
-    return wordpos.seek('foobar', 'a').catch(function (err) {
-      assert(err instanceof Error);
-      assert.equal(err.message, 'Offset must be valid positive number: foobar');
-    });
+    return wordpos.seek('foobar', 'a').catch(assertOffsetErr);
   });
 
 });