diff --git a/.eslintrc b/.eslintrc
new file mode 100644
index 0000000..0283e5f
--- /dev/null
+++ b/.eslintrc
@@ -0,0 +1,11 @@
+{
+  "extends": "airbnb",
+  "env": {
+    "browser": true,
+    "node": true
+  },
+  "rules": {
+    "no-underscore-dangle": 0,
+    "no-console": 0
+  }
+}
diff --git a/examples/node/basic.js b/examples/node/basic.js
index f3deeb4..ee0d69c 100644
--- a/examples/node/basic.js
+++ b/examples/node/basic.js
@@ -1,15 +1,18 @@
 // replace this with require('tesseract.js')
-var Tesseract = require('../../'),
-    image = require('path').resolve(__dirname, 'cosmic.png');
+const path = require('path');
+const { TesseractWorker } = require('../../');
 
-Tesseract.recognize(image)
-    .then(data => {
-        console.log('then\n', data.text)
-    })
-    .catch(err => {
-      console.log('catch\n', err);
-    })
-    .finally(e => {
-      console.log('finally\n');
-      process.exit();
-    });
\ No newline at end of file
+const image = path.resolve(__dirname, 'cosmic.png');
+const tessWorker = new TesseractWorker();
+
+tessWorker.recognize(image)
+  .then((data) => {
+    console.log('then\n', data.text);
+  })
+  .catch((err) => {
+    console.log('catch\n', err);
+  })
+  .finally(() => {
+    console.log('finally\n');
+    process.exit();
+  });
diff --git a/examples/node/detect.js b/examples/node/detect.js
index 27def3a..b2e948a 100644
--- a/examples/node/detect.js
+++ b/examples/node/detect.js
@@ -1,12 +1,15 @@
 // replace this with require('tesseract.js')
-var Tesseract = require('../../'),
-	image = require('path').resolve(__dirname, 'cosmic.png');
+const path = require('path');
+const { TesseractWorker } = require('../../');
 
-Tesseract.detect(image)
-	.progress(function(info){
-		console.log(info);
-	})
-	.then(function(data){
-		console.log('done', data);
-		process.exit();
-	})
\ No newline at end of file
+const image = path.resolve(__dirname, 'cosmic.png');
+const tessWorker = new TesseractWorker();
+
+tessWorker.detect(image)
+  .progress((info) => {
+    console.log(info);
+  })
+  .then((data) => {
+    console.log('done', data);
+    process.exit();
+  });
diff --git a/package-lock.json b/package-lock.json
index 94628cd..667a512 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -4,6 +4,63 @@
   "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"
+      },
+      "dependencies": {
+        "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"
+          }
+        },
+        "chalk": {
+          "version": "2.4.1",
+          "resolved": "https://registry.npmjs.org/chalk/-/chalk-2.4.1.tgz",
+          "integrity": "sha512-ObN6h1v2fTJSmUXoS3nMQ92LbDK9be4TV+6G+omQlGJFdcUX5heKi1LZ1YnRMIgwTLEj3E24bT6tYni50rlCfQ==",
+          "dev": true,
+          "requires": {
+            "ansi-styles": "^3.2.1",
+            "escape-string-regexp": "^1.0.5",
+            "supports-color": "^5.3.0"
+          }
+        },
+        "js-tokens": {
+          "version": "4.0.0",
+          "resolved": "https://registry.npmjs.org/js-tokens/-/js-tokens-4.0.0.tgz",
+          "integrity": "sha512-RdJUflcE3cUzKiMqQgsCu06FPu9UdIJO0beYbPhHN4k6apgJtifcoCtT9bcxOpYBtpD2kCM6Sbzg4CausW/PKQ==",
+          "dev": true
+        },
+        "supports-color": {
+          "version": "5.5.0",
+          "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-5.5.0.tgz",
+          "integrity": "sha512-QjVjwdXIt408MIiAqCX4oUKsgU2EqAGzs2Ppkm4aQYbjm+ZEWEcW4SfFNTr4uMNZma0ey4f5lgLrkB0aX0QMow==",
+          "dev": true,
+          "requires": {
+            "has-flag": "^3.0.0"
+          }
+        }
+      }
+    },
     "JSONStream": {
       "version": "1.3.1",
       "resolved": "https://registry.npmjs.org/JSONStream/-/JSONStream-1.3.1.tgz",
@@ -35,12 +92,36 @@
       "integrity": "sha1-EFSVrlNh1pe9GVyCUZLhrX8lN4c=",
       "dev": true
     },
+    "acorn-jsx": {
+      "version": "5.0.0",
+      "resolved": "https://registry.npmjs.org/acorn-jsx/-/acorn-jsx-5.0.0.tgz",
+      "integrity": "sha512-XkB50fn0MURDyww9+UYL3c1yLbOBz0ZFvrdYlGB8l+Ije1oSC75qAqrzSPjYQbdnQUzhlUGNKuesryAv0gxZOg==",
+      "dev": true
+    },
+    "ajv": {
+      "version": "6.5.5",
+      "resolved": "https://registry.npmjs.org/ajv/-/ajv-6.5.5.tgz",
+      "integrity": "sha512-7q7gtRQDJSyuEHjuVgHoUa2VuemFiCMrfQc9Tc08XTAc4Zj/5U1buQJ0HU6i7fKjXU09SVgSmxa4sLvuvS8Iyg==",
+      "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"
+      }
+    },
     "amdefine": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/amdefine/-/amdefine-1.0.1.tgz",
       "integrity": "sha1-SlKCrBZHKek2Gbz9OtFR+BfOkfU=",
       "dev": true
     },
+    "ansi-escapes": {
+      "version": "3.1.0",
+      "resolved": "http://registry.npmjs.org/ansi-escapes/-/ansi-escapes-3.1.0.tgz",
+      "integrity": "sha512-UgAb8H9D41AQnu/PbWlCofQVcnV4Gs2bBJi9eZPxfU/hgglFh3SMDMENRIqdr7H6XFnXdoknctFByVsCOotTVw==",
+      "dev": true
+    },
     "ansi-regex": {
       "version": "2.1.1",
       "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-2.1.1.tgz",
@@ -63,6 +144,25 @@
         "normalize-path": "^2.0.0"
       }
     },
+    "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"
+      }
+    },
+    "aria-query": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/aria-query/-/aria-query-3.0.0.tgz",
+      "integrity": "sha1-ZbP8wcoRVajJrmTW7uKX8V1RM8w=",
+      "dev": true,
+      "requires": {
+        "ast-types-flow": "0.0.7",
+        "commander": "^2.11.0"
+      }
+    },
     "arr-diff": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/arr-diff/-/arr-diff-2.0.0.tgz",
@@ -84,6 +184,16 @@
       "integrity": "sha1-fajPLiZijtcygDWB/SH2fKzS7uw=",
       "dev": true
     },
+    "array-includes": {
+      "version": "3.0.3",
+      "resolved": "https://registry.npmjs.org/array-includes/-/array-includes-3.0.3.tgz",
+      "integrity": "sha1-GEtI9i2S10UrsxsyMWXH+L0CJm0=",
+      "dev": true,
+      "requires": {
+        "define-properties": "^1.1.2",
+        "es-abstract": "^1.7.0"
+      }
+    },
     "array-map": {
       "version": "0.0.0",
       "resolved": "https://registry.npmjs.org/array-map/-/array-map-0.0.0.tgz",
@@ -128,6 +238,12 @@
       "integrity": "sha1-ECyenpAF0+fjgpvwxPok7oYu6bk=",
       "dev": true
     },
+    "ast-types-flow": {
+      "version": "0.0.7",
+      "resolved": "https://registry.npmjs.org/ast-types-flow/-/ast-types-flow-0.0.7.tgz",
+      "integrity": "sha1-9wtzXGvKGlycItmCw+Oef+ujva0=",
+      "dev": true
+    },
     "astw": {
       "version": "2.2.0",
       "resolved": "https://registry.npmjs.org/astw/-/astw-2.2.0.tgz",
@@ -149,6 +265,15 @@
       "integrity": "sha1-GdOGodntxufByF04iu28xW0zYC0=",
       "dev": true
     },
+    "axobject-query": {
+      "version": "2.0.2",
+      "resolved": "https://registry.npmjs.org/axobject-query/-/axobject-query-2.0.2.tgz",
+      "integrity": "sha512-MCeek8ZH7hKyO1rWUbKNQBbl4l2eY0ntk7OGi+q0RlafrCnfPxC06WZA+uebCfmYp4mNU9jRBP1AhGyf8+W3ww==",
+      "dev": true,
+      "requires": {
+        "ast-types-flow": "0.0.7"
+      }
+    },
     "babel-code-frame": {
       "version": "6.22.0",
       "resolved": "https://registry.npmjs.org/babel-code-frame/-/babel-code-frame-6.22.0.tgz",
@@ -961,6 +1086,21 @@
       "integrity": "sha1-0JxLUoAKpMB44t2BqGmqyQ0uVOc=",
       "dev": true
     },
+    "caller-path": {
+      "version": "0.1.0",
+      "resolved": "https://registry.npmjs.org/caller-path/-/caller-path-0.1.0.tgz",
+      "integrity": "sha1-lAhe9jWB7NPaqSREqP6U6CV3dR8=",
+      "dev": true,
+      "requires": {
+        "callsites": "^0.2.0"
+      }
+    },
+    "callsites": {
+      "version": "0.2.0",
+      "resolved": "https://registry.npmjs.org/callsites/-/callsites-0.2.0.tgz",
+      "integrity": "sha1-r6uWJikQp/M8GaV3WCXGnzTjUMo=",
+      "dev": true
+    },
     "chalk": {
       "version": "1.1.3",
       "resolved": "https://registry.npmjs.org/chalk/-/chalk-1.1.3.tgz",
@@ -974,6 +1114,17 @@
         "supports-color": "^2.0.0"
       }
     },
+    "chardet": {
+      "version": "0.7.0",
+      "resolved": "https://registry.npmjs.org/chardet/-/chardet-0.7.0.tgz",
+      "integrity": "sha512-mT8iDcrh03qDGRRmoA2hmBJnxpllMR+0/0qlzjqZES6NdiWDcZkCNAk4rPFZ9Q85r27unkiNNg8ZOiwZXBHwcA==",
+      "dev": true
+    },
+    "check-types": {
+      "version": "7.4.0",
+      "resolved": "https://registry.npmjs.org/check-types/-/check-types-7.4.0.tgz",
+      "integrity": "sha512-YbulWHdfP99UfZ73NcUDlNJhEIDgm9Doq9GhpyXbF+7Aegi3CVV7qqMCKTTqJxlvEvnQBp9IA+dxsGN6xK/nSg=="
+    },
     "chokidar": {
       "version": "1.7.0",
       "resolved": "https://registry.npmjs.org/chokidar/-/chokidar-1.7.0.tgz",
@@ -1001,6 +1152,27 @@
         "safe-buffer": "^5.0.1"
       }
     },
+    "circular-json": {
+      "version": "0.3.3",
+      "resolved": "https://registry.npmjs.org/circular-json/-/circular-json-0.3.3.tgz",
+      "integrity": "sha512-UZK3NBx2Mca+b5LsG7bY183pHWt5Y1xts4P3Pz7ENTwGVnJOUWbRb3ocjvX7hx9tq/yTAdclXm9sZ38gNuem4A==",
+      "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",
@@ -1201,6 +1373,12 @@
       "integrity": "sha1-wguW2MYXdIqvHBYCF2DNJ/y4y3U=",
       "dev": true
     },
+    "contains-path": {
+      "version": "0.1.0",
+      "resolved": "https://registry.npmjs.org/contains-path/-/contains-path-0.1.0.tgz",
+      "integrity": "sha1-/ozxhP9mcLa67wGp1IYaXL7EEgo=",
+      "dev": true
+    },
     "convert-source-map": {
       "version": "1.5.0",
       "resolved": "https://registry.npmjs.org/convert-source-map/-/convert-source-map-1.5.0.tgz",
@@ -1261,6 +1439,19 @@
         "sha.js": "^2.4.8"
       }
     },
+    "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": {
+        "nice-try": "^1.0.4",
+        "path-key": "^2.0.1",
+        "semver": "^5.5.0",
+        "shebang-command": "^1.2.0",
+        "which": "^1.2.9"
+      }
+    },
     "crypto-browserify": {
       "version": "3.11.1",
       "resolved": "https://registry.npmjs.org/crypto-browserify/-/crypto-browserify-3.11.1.tgz",
@@ -1279,6 +1470,12 @@
         "randombytes": "^2.0.0"
       }
     },
+    "damerau-levenshtein": {
+      "version": "1.0.4",
+      "resolved": "https://registry.npmjs.org/damerau-levenshtein/-/damerau-levenshtein-1.0.4.tgz",
+      "integrity": "sha1-AxkcQyy27qFou3fzpV/9zLiXhRQ=",
+      "dev": true
+    },
     "date-fns": {
       "version": "1.29.0",
       "resolved": "https://registry.npmjs.org/date-fns/-/date-fns-1.29.0.tgz",
@@ -1300,6 +1497,29 @@
         "ms": "2.0.0"
       }
     },
+    "deep-is": {
+      "version": "0.1.3",
+      "resolved": "https://registry.npmjs.org/deep-is/-/deep-is-0.1.3.tgz",
+      "integrity": "sha1-s2nW+128E+7PUk+RsHD+7cNXzzQ=",
+      "dev": true
+    },
+    "define-properties": {
+      "version": "1.1.3",
+      "resolved": "https://registry.npmjs.org/define-properties/-/define-properties-1.1.3.tgz",
+      "integrity": "sha512-3MqfYKj2lLzdMSf8ZIZE/V+Zuy+BgD6f164e8K2w7dgnpKArBDerGYpM46IYYcjnkdPNMjPk9A6VFB8+3SKlXQ==",
+      "dev": true,
+      "requires": {
+        "object-keys": "^1.0.12"
+      },
+      "dependencies": {
+        "object-keys": {
+          "version": "1.0.12",
+          "resolved": "https://registry.npmjs.org/object-keys/-/object-keys-1.0.12.tgz",
+          "integrity": "sha512-FTMyFUm2wBcGHnH2eXmz7tC6IwlqQZ6mVZ+6dm6vZ4IQIHjs6FdNsQBuKGPuUUUY6NfJw2PshC08Tn6LzLDOag==",
+          "dev": true
+        }
+      }
+    },
     "defined": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/defined/-/defined-1.0.0.tgz",
@@ -1358,6 +1578,15 @@
         "randombytes": "^2.0.0"
       }
     },
+    "doctrine": {
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/doctrine/-/doctrine-2.1.0.tgz",
+      "integrity": "sha512-35mSku4ZXK0vfCuHEDAwt55dg2jNajHZ1odvF+8SSr82EsZY4QmXfuWso8oEd8zRhVObSN18aM0CjSdoBX7zIw==",
+      "dev": true,
+      "requires": {
+        "esutils": "^2.0.2"
+      }
+    },
     "domain-browser": {
       "version": "1.1.7",
       "resolved": "https://registry.npmjs.org/domain-browser/-/domain-browser-1.1.7.tgz",
@@ -1408,6 +1637,12 @@
         "minimalistic-crypto-utils": "^1.0.0"
       }
     },
+    "emoji-regex": {
+      "version": "6.5.1",
+      "resolved": "https://registry.npmjs.org/emoji-regex/-/emoji-regex-6.5.1.tgz",
+      "integrity": "sha512-PAHp6TxrCy7MGMFidro8uikr+zlJJKJ/Q6mm2ExZ7HwkyR9lSVFfE3kt36qcwa24BQL7y0G9axycGjK1A/0uNQ==",
+      "dev": true
+    },
     "encoding": {
       "version": "0.1.12",
       "resolved": "https://registry.npmjs.org/encoding/-/encoding-0.1.12.tgz",
@@ -1435,84 +1670,529 @@
         "is-arrayish": "^0.2.1"
       }
     },
+    "es-abstract": {
+      "version": "1.12.0",
+      "resolved": "https://registry.npmjs.org/es-abstract/-/es-abstract-1.12.0.tgz",
+      "integrity": "sha512-C8Fx/0jFmV5IPoMOFPA9P9G5NtqW+4cOPit3MIuvR2t7Ag2K15EJTpxnHAYTzL+aYQJIESYeXZmDBfOBE1HcpA==",
+      "dev": true,
+      "requires": {
+        "es-to-primitive": "^1.1.1",
+        "function-bind": "^1.1.1",
+        "has": "^1.0.1",
+        "is-callable": "^1.1.3",
+        "is-regex": "^1.0.4"
+      },
+      "dependencies": {
+        "function-bind": {
+          "version": "1.1.1",
+          "resolved": "https://registry.npmjs.org/function-bind/-/function-bind-1.1.1.tgz",
+          "integrity": "sha512-yIovAzMX49sF8Yl58fSCWJ5svSLuaibPxXQJFLmBObTuCr0Mf1KiPopGM9NiFjiYBCbfaa2Fh6breQ6ANVTI0A==",
+          "dev": true
+        }
+      }
+    },
+    "es-to-primitive": {
+      "version": "1.2.0",
+      "resolved": "https://registry.npmjs.org/es-to-primitive/-/es-to-primitive-1.2.0.tgz",
+      "integrity": "sha512-qZryBOJjV//LaxLTV6UC//WewneB3LcXOL9NP++ozKVXsIIIpm/2c13UDiD9Jp2eThsecw9m3jPqDwTyobcdbg==",
+      "dev": true,
+      "requires": {
+        "is-callable": "^1.1.4",
+        "is-date-object": "^1.0.1",
+        "is-symbol": "^1.0.2"
+      }
+    },
     "escape-string-regexp": {
       "version": "1.0.5",
       "resolved": "https://registry.npmjs.org/escape-string-regexp/-/escape-string-regexp-1.0.5.tgz",
       "integrity": "sha1-G2HAViGQqN/2rjuyzwIAyhMLhtQ=",
       "dev": true
     },
-    "esprima-fb": {
-      "version": "15001.1.0-dev-harmony-fb",
-      "resolved": "https://registry.npmjs.org/esprima-fb/-/esprima-fb-15001.1.0-dev-harmony-fb.tgz",
-      "integrity": "sha1-MKlHMDxrjV6VW+4rmbHSMyBqaQE=",
-      "dev": true
-    },
-    "esutils": {
-      "version": "2.0.2",
-      "resolved": "https://registry.npmjs.org/esutils/-/esutils-2.0.2.tgz",
-      "integrity": "sha1-Cr9PHKpbyx96nYrMbepPqqBLrJs=",
-      "dev": true
-    },
-    "eventemitter3": {
-      "version": "1.2.0",
-      "resolved": "https://registry.npmjs.org/eventemitter3/-/eventemitter3-1.2.0.tgz",
-      "integrity": "sha1-HIaZHYFq0eUEdQ5zh0Ik7PO+xQg=",
-      "dev": true
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+      "version": "2.1.1",
+      "resolved": "https://registry.npmjs.org/string-width/-/string-width-2.1.1.tgz",
+      "integrity": "sha512-nOqH59deCq9SRHlxq1Aw85Jnt4w6KvLKqWVik6oA9ZklXLNIOlqg4F2yrT1MVaTjAqvVwdfeZ7w7aCvJD7ugkw==",
+      "dev": true,
+      "requires": {
+        "is-fullwidth-code-point": "^2.0.0",
+        "strip-ansi": "^4.0.0"
+      },
+      "dependencies": {
+        "ansi-regex": {
+          "version": "3.0.0",
+          "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-3.0.0.tgz",
+          "integrity": "sha1-7QMXwyIGT3lGbAKWa922Bas32Zg=",
+          "dev": true
+        },
+        "strip-ansi": {
+          "version": "4.0.0",
+          "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-4.0.0.tgz",
+          "integrity": "sha1-qEeQIusaw2iocTibY1JixQXuNo8=",
+          "dev": true,
+          "requires": {
+            "ansi-regex": "^3.0.0"
+          }
+        }
+      }
+    },
     "string_decoder": {
       "version": "0.10.31",
       "resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-0.10.31.tgz",
@@ -3457,6 +4763,12 @@
       "integrity": "sha1-IzTBjpx1n3vdVv3vfprj1YjmjtM=",
       "dev": true
     },
+    "strip-json-comments": {
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/strip-json-comments/-/strip-json-comments-2.0.1.tgz",
+      "integrity": "sha1-PFMZQukIwml8DsNEhYwobHygpgo=",
+      "dev": true
+    },
     "subarg": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/subarg/-/subarg-1.0.0.tgz",
@@ -3489,11 +4801,37 @@
         "acorn": "^4.0.3"
       }
     },
+    "table": {
+      "version": "5.1.0",
+      "resolved": "https://registry.npmjs.org/table/-/table-5.1.0.tgz",
+      "integrity": "sha512-e542in22ZLhD/fOIuXs/8yDZ9W61ltF8daM88rkRNtgTIct+vI2fTnAyu/Db2TCfEcI8i7mjZz6meLq0nW7TYg==",
+      "dev": true,
+      "requires": {
+        "ajv": "^6.5.3",
+        "lodash": "^4.17.10",
+        "slice-ansi": "1.0.0",
+        "string-width": "^2.1.1"
+      },
+      "dependencies": {
+        "lodash": {
+          "version": "4.17.11",
+          "resolved": "https://registry.npmjs.org/lodash/-/lodash-4.17.11.tgz",
+          "integrity": "sha512-cQKh8igo5QUhZ7lg38DYWAxMvjSAKG0A8wGSVimP07SIUEK2UO+arSRKbRZWtelMtN5V0Hkwh5ryOto/SshYIg==",
+          "dev": true
+        }
+      }
+    },
     "tesseract.js-core": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/tesseract.js-core/-/tesseract.js-core-1.0.2.tgz",
       "integrity": "sha1-HOM6KdyBI1e4NWow7e34sYgEOzc="
     },
+    "text-table": {
+      "version": "0.2.0",
+      "resolved": "https://registry.npmjs.org/text-table/-/text-table-0.2.0.tgz",
+      "integrity": "sha1-f17oI66AUgfACvLfSoTsP8+lcLQ=",
+      "dev": true
+    },
     "through": {
       "version": "2.3.8",
       "resolved": "https://registry.npmjs.org/through/-/through-2.3.8.tgz",
@@ -3527,6 +4865,15 @@
         "process": "~0.11.0"
       }
     },
+    "tmp": {
+      "version": "0.0.33",
+      "resolved": "https://registry.npmjs.org/tmp/-/tmp-0.0.33.tgz",
+      "integrity": "sha512-jRCJlojKnZ3addtTOjdIqoRuPEKBvNXcGYqzO6zWZX8KfKEpnGY5jfggJQ3EjKuu8D4bJRr0y+cYJFmYbImXGw==",
+      "dev": true,
+      "requires": {
+        "os-tmpdir": "~1.0.2"
+      }
+    },
     "to-arraybuffer": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/to-arraybuffer/-/to-arraybuffer-1.0.1.tgz",
@@ -3551,12 +4898,27 @@
       "integrity": "sha1-yy4SAwZ+DI3h9hQJS5/kVwTqYAM=",
       "dev": true
     },
+    "tslib": {
+      "version": "1.9.3",
+      "resolved": "https://registry.npmjs.org/tslib/-/tslib-1.9.3.tgz",
+      "integrity": "sha512-4krF8scpejhaOgqzBEcGM7yDIEfi0/8+8zDRZhNZZ2kjmHJ4hv3zCbQWxoJGz1iw5U0Jl0nma13xzHXcncMavQ==",
+      "dev": true
+    },
     "tty-browserify": {
       "version": "0.0.0",
       "resolved": "https://registry.npmjs.org/tty-browserify/-/tty-browserify-0.0.0.tgz",
       "integrity": "sha1-oVe6QC2iTpv5V/mqadUk7tQpAaY=",
       "dev": true
     },
+    "type-check": {
+      "version": "0.3.2",
+      "resolved": "https://registry.npmjs.org/type-check/-/type-check-0.3.2.tgz",
+      "integrity": "sha1-WITKtRLPHTVeP7eE8wgEsrUg23I=",
+      "dev": true,
+      "requires": {
+        "prelude-ls": "~1.1.2"
+      }
+    },
     "typedarray": {
       "version": "0.0.6",
       "resolved": "https://registry.npmjs.org/typedarray/-/typedarray-0.0.6.tgz",
@@ -3607,6 +4969,23 @@
         "qs": "~2.3.3"
       }
     },
+    "uri-js": {
+      "version": "4.2.2",
+      "resolved": "https://registry.npmjs.org/uri-js/-/uri-js-4.2.2.tgz",
+      "integrity": "sha512-KY9Frmirql91X2Qgjry0Wd4Y+YTdrdZheS8TFwvkbLWf/G5KNJDCh6pKL5OZctEW4+0Baa5idK2ZQuELRwPznQ==",
+      "dev": true,
+      "requires": {
+        "punycode": "^2.1.0"
+      },
+      "dependencies": {
+        "punycode": {
+          "version": "2.1.1",
+          "resolved": "https://registry.npmjs.org/punycode/-/punycode-2.1.1.tgz",
+          "integrity": "sha512-XRsRjdf+j5ml+y/6GKHPZbrF/8p2Yga0JPtdqTIY2Xe5ohJPD9saDJJLPvp9+NSBprVvevdXZybnj2cv8OEd0A==",
+          "dev": true
+        }
+      }
+    },
     "url": {
       "version": "0.11.0",
       "resolved": "https://registry.npmjs.org/url/-/url-0.11.0.tgz",
@@ -3781,6 +5160,15 @@
       "resolved": "https://registry.npmjs.org/whatwg-fetch/-/whatwg-fetch-2.0.3.tgz",
       "integrity": "sha1-nITsLc9oGH/wC8ZOEnS0QhduHIQ="
     },
+    "which": {
+      "version": "1.3.1",
+      "resolved": "https://registry.npmjs.org/which/-/which-1.3.1.tgz",
+      "integrity": "sha512-HxJdYWq1MTIQbJ3nw0cqssHoTNU267KlrDuGZ1WYlxDStUtKUhOaJmh112/TZmHxxUfuJqPXSOm7tDyas0OSIQ==",
+      "dev": true,
+      "requires": {
+        "isexe": "^2.0.0"
+      }
+    },
     "wordwrap": {
       "version": "0.0.3",
       "resolved": "https://registry.npmjs.org/wordwrap/-/wordwrap-0.0.3.tgz",
@@ -3793,6 +5181,15 @@
       "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8=",
       "dev": true
     },
+    "write": {
+      "version": "0.2.1",
+      "resolved": "https://registry.npmjs.org/write/-/write-0.2.1.tgz",
+      "integrity": "sha1-X8A4KOJkzqP+kUVUdvejxWbLB1c=",
+      "dev": true,
+      "requires": {
+        "mkdirp": "^0.5.1"
+      }
+    },
     "xtend": {
       "version": "2.1.2",
       "resolved": "https://registry.npmjs.org/xtend/-/xtend-2.1.2.tgz",
diff --git a/package.json b/package.json
index 06caff9..8c3ce5f 100644
--- a/package.json
+++ b/package.json
@@ -22,15 +22,21 @@
     "browserify": "^13.1.0",
     "concurrently": "^3.1.0",
     "envify": "^3.4.1",
+    "eslint": "^5.9.0",
+    "eslint-config-airbnb": "^17.1.0",
+    "eslint-plugin-import": "^2.14.0",
+    "eslint-plugin-jsx-a11y": "^6.1.2",
+    "eslint-plugin-react": "^7.11.1",
     "http-server": "^0.9.0",
     "pako": "^1.0.3",
     "uglify-js": "^3.4.9",
     "watchify": "^3.7.0"
   },
   "dependencies": {
+    "check-types": "^7.4.0",
     "file-type": "^3.8.0",
-    "isomorphic-fetch": "^2.2.1",
     "is-url": "1.2.2",
+    "isomorphic-fetch": "^2.2.1",
     "jpeg-js": "^0.2.0",
     "level-js": "^2.2.4",
     "node-fetch": "^1.6.3",
diff --git a/src/index.js b/src/index.js
index 5359974..fc018d1 100644
--- a/src/index.js
+++ b/src/index.js
@@ -1,75 +1,91 @@
-const adapter = require('./node/index.js')
-const circularize = require('./common/circularize.js')
+const check = require('check-types');
+const adapter = require('./node/index.js');
+const circularize = require('./common/circularize.js');
 const TesseractJob = require('./common/job');
-const version = require('../package.json').version;
-
-const create = function(workerOptions = {}){
-	var worker = new TesseractWorker(Object.assign({}, adapter.defaultOptions, workerOptions));
-	worker.create = create;
-	worker.version = version;
-	return worker;
-}
 
 class TesseractWorker {
-	constructor(workerOptions){
-		this.worker = null;
-		this.workerOptions = workerOptions;
-		this._currentJob = null;
-		this._queue = [];
-	}
-
-	recognize(image, options = {}){
-		return this._delay(job => {
-			if (typeof options === 'string') options = {lang: options}
-			options.lang = options.lang || 'eng';
+  constructor(workerOptions = {}) {
+    this.worker = null;
+    this.workerOptions = Object.assign({}, adapter.defaultOptions, workerOptions);
+    this._currentJob = null;
+    this._queue = [];
+  }
 
-			job._send('recognize', { image, options, workerOptions: this.workerOptions });
-		})
-	}
-	detect(image, options = {}){
-		return this._delay(job => {
-			job._send('detect', { image, options, workerOptions: this.workerOptions });
-		})
-	}
+  recognize(image, options = { lang: 'eng' }) {
+    return this._delay((job) => {
+      job._send(
+        'recognize',
+        {
+          image,
+          options: check.string(options)
+            ? { lang: options || 'eng' }
+            : options,
+          workerOptions: this.workerOptions,
+        },
+      );
+    });
+  }
 
-	terminate(){
-		if(this.worker) adapter.terminateWorker(this);
-		this.worker = null;
-		this._currentJob = null;
-		this._queue = [];
-	}
+  detect(image, options = {}) {
+    return this._delay((job) => {
+      job._send(
+        'detect',
+        {
+          image,
+          options,
+          workerOptions: this.workerOptions,
+        },
+      );
+    });
+  }
 
-	_delay(fn){
-		if(!this.worker) this.worker = adapter.spawnWorker(this, this.workerOptions);
+  terminate() {
+    if (this.worker) {
+      adapter.terminateWorker(this);
+    }
+    this.worker = null;
+    this._currentJob = null;
+    this._queue = [];
+  }
 
-		var job = new TesseractJob(this);
-		this._queue.push(e => {
-			this._queue.shift();
-			this._currentJob = job;
-			fn(job);
-		});
-		if(!this._currentJob) this._dequeue();
-		return job;
-	}
+  _delay(fn) {
+    if (check.null(this.worker)) {
+      this.worker = adapter.spawnWorker(this, this.workerOptions);
+    }
 
-	_dequeue(){
-		this._currentJob = null;
-		if(this._queue.length){
-			this._queue[0]();
-		}
-	}
+    const job = new TesseractJob(this);
+    this._queue.push(() => {
+      this._queue.shift();
+      this._currentJob = job;
+      fn(job);
+    });
+    if (check.null(this._currentJob)) {
+      this._dequeue();
+    }
+    return job;
+  }
 
-	_recv(packet){
-        if(packet.status === 'resolve' && packet.action === 'recognize'){
-            packet.data = circularize(packet.data);
-        }
+  _dequeue() {
+    this._currentJob = null;
+    if (this._queue.length) {
+      this._queue[0]();
+    }
+  }
 
-		if(this._currentJob.id === packet.jobId){
-			this._currentJob._handle(packet)
-		} else {
-			console.warn('Job ID ' + packet.jobId + ' not known.')
-		}
-	}
+  _recv(packet) {
+    if (this._currentJob.id === packet.jobId) {
+      this._currentJob._handle({
+        data: packet.status === 'resolve' && packet.action === 'recognize'
+          ? circularize(packet.data)
+          : packet.data,
+        ...packet,
+      });
+    } else {
+      console.warn(`Job ID ${packet.jobId} not known.`);
+    }
+  }
 }
 
-module.exports = create();
+module.exports = {
+  TesseractWorker,
+};