diff --git a/src/.createScheduler.js.swp b/src/.createScheduler.js.swp
new file mode 100644
index 0000000..acfa2ec
Binary files /dev/null and b/src/.createScheduler.js.swp differ
diff --git a/src/index.d.ts b/src/index.d.ts
index 59e8a75..05a59bb 100644
--- a/src/index.d.ts
+++ b/src/index.d.ts
@@ -3,10 +3,10 @@ declare namespace Tesseract {
   function createWorker(options?: Partial<WorkerOptions>): Worker
   function setLogging(logging: boolean): void
   function recognize(image: ImageLike, langs?: string, options?: Partial<WorkerOptions>): Promise<RecognizeResult>
-  function detect(image: ImageLike, langs?: string, options?: Partial<WorkerOptions>)
+  function detect(image: ImageLike, options?: Partial<WorkerOptions>)
 
   interface Scheduler {
-    addWorker(worker: Worker): void
+    addWorker(worker: Worker): string
     addJob(action: string, ...args: any[]): Promise<ConfigResult | RecognizeResult | DetectResult>
     terminate(): Promise<any>
     getQueueLen(): number
@@ -16,7 +16,8 @@ declare namespace Tesseract {
   interface Worker {
     load(jobId?: string): Promise<ConfigResult>
     loadLanguage(langs?: string, jobId?: string): Promise<ConfigResult>
-    initialize(langs?: string, params?: Partial<WorkerParams>, jobId?: string): Promise<ConfigResult>
+    initialize(langs?: string, oem?: OEM, jobId?: string): Promise<ConfigResult>
+    setParameters(params: Partial<WorkerParams>, jobId?: string): Promise<ConfigResult>
     recognize(image: ImageLike, options?: Partial<RecognizeOptions>, jobId?: string): Promise<RecognizeResult>
     detect(image: ImageLike, jobId?: string): Promise<DetectResult>
     terminate(jobId?: string): Promise<ConfigResult>
@@ -37,7 +38,6 @@ declare namespace Tesseract {
     tessedit_ocr_engine_mode: OEM
     tessedit_pageseg_mode: PSM
     tessedit_char_whiltelist: string
-    tessjs_create_pdf: string
     tessjs_create_hocr: string
     tessjs_create_tsv: string
     tessjs_create_box: string
@@ -88,10 +88,10 @@ declare namespace Tesseract {
     SINGLE_BLOCK = '6',
     SINGLE_LINE = '7',
     SINGLE_WORD = '8',
-    SINGLE_CHAR = '9',
-    SPARSE_TEXT = '10',
-    SPARSE_TEXT_OSD = '11',
-    RAW_LINE = '12'
+    CIRCLE_WORD = '9',
+    SINGLE_CHAR = '10',
+    SPARSE_TEXT = '11',
+    SPARSE_TEXT_OSD = '12',
   }
   type ImageLike = string | HTMLImageElement | HTMLCanvasElement | HTMLVideoElement
     | CanvasRenderingContext2D | File | Blob | ImageData | Buffer;
diff --git a/src/utils/circularize.js b/src/utils/circularize.js
index 6e682a1..55486da 100644
--- a/src/utils/circularize.js
+++ b/src/utils/circularize.js
@@ -9,9 +9,6 @@
  * a (circular) DOM-like interface for walking
  * through the data.
  *
- * A (circular) DOM-like interface here means that
- * each child element
- *
  * @fileoverview DOM-like interface for walking through data
  * @author Kevin Kwok <antimatter15@gmail.com>
  * @author Guillermo Webster <gui@mit.edu>
diff --git a/src/worker-script/constants/defaultParams.js b/src/worker-script/constants/defaultParams.js
index 3238f03..2e45308 100644
--- a/src/worker-script/constants/defaultParams.js
+++ b/src/worker-script/constants/defaultParams.js
@@ -7,15 +7,9 @@ module.exports = {
   tessedit_pageseg_mode: PSM.SINGLE_BLOCK,
   tessedit_char_whiltelist: '',
   user_defined_dpi: '300',
-  tessjs_create_pdf: '0',
   tessjs_create_hocr: '1',
   tessjs_create_tsv: '1',
   tessjs_create_box: '0',
   tessjs_create_unlv: '0',
   tessjs_create_osd: '0',
-  tessjs_textonly_pdf: '0',
-  tessjs_pdf_name: 'tesseract.js-ocr-result',
-  tessjs_pdf_title: 'Tesseract.js OCR Result',
-  tessjs_pdf_auto_download: true,
-  tessjs_pdf_bin: false,
 };
diff --git a/src/worker-script/utils/dump.js b/src/worker-script/utils/dump.js
index abaf541..bafd9f5 100644
--- a/src/worker-script/utils/dump.js
+++ b/src/worker-script/utils/dump.js
@@ -17,8 +17,6 @@
  * @name deindent
  * @function deindent string
  * @access public
- * @param {string} html HOCR in html format
- * @returns {string} deindent html string
  */
 const deindent = (html) => {
   const lines = html.split('\n');
@@ -38,9 +36,6 @@ const deindent = (html) => {
  * @name dump
  * @function dump recognition result to a JSON object
  * @access public
- * @param {object} TessModule TessModule from TesseractCore
- * @param {object} api TesseractBaseAPI instance
- * @returns {object} dumpped JSON object
  */
 module.exports = (TessModule, api, {
   tessjs_create_hocr,
diff --git a/src/worker-script/utils/setImage.js b/src/worker-script/utils/setImage.js
index 6ae356d..e9918db 100644
--- a/src/worker-script/utils/setImage.js
+++ b/src/worker-script/utils/setImage.js
@@ -7,8 +7,6 @@ const fileType = require('file-type');
  * @name setImage
  * @function set image in tesseract for recognition
  * @access public
- * @param {array} image - binary array in array format
- * @returns {number} - an emscripten pointer of the image
  */
 module.exports = (TessModule, api, image) => {
   const buf = Buffer.from(Array.from({ ...image, length: Object.keys(image).length }));
diff --git a/src/worker/browser/defaultOptions.js~ b/src/worker/browser/defaultOptions.js~
deleted file mode 100644
index cef5e58..0000000
--- a/src/worker/browser/defaultOptions.js~
+++ /dev/null
@@ -1,18 +0,0 @@
-const resolveURL = require('resolve-url');
-const { version, dependencies } = require('../../../package.json');
-const defaultOptions = require('../../constants/defaultOptions');
-
-/*
- * Default options for browser worker
- */
-module.exports = {
-  ...defaultOptions,
-  workerPath: (typeof process !== 'undefined' && process.env.TESS_ENV === 'development')
-    ? resolveURL(`/dist/worker.dev.js?nocache=${Math.random().toString(36).slice(3)}`)
-    : `https://unpkg.com/tesseract.js@v${version}/dist/worker.min.js`,
-  /*
-   * If browser doesn't support WebAssembly,
-   * load ASM version instead
-   */
-  corePath: `https://unpkg.com/tesseract.js-core@v${dependencies['tesseract.js-core'].substring(1)}/tesseract-core.${typeof WebAssembly === 'object' ? 'wasm' : 'asm'}.js`,
-};
diff --git a/src/worker/browser/loadImage.js b/src/worker/browser/loadImage.js
index b849153..864eede 100644
--- a/src/worker/browser/loadImage.js
+++ b/src/worker/browser/loadImage.js
@@ -7,8 +7,6 @@ const resolveURL = require('resolve-url');
  * @name readFromBlobOrFile
  * @function
  * @access private
- * @param {object} blob A blob or file objec to read
- * @param {function} res callback function after reading completes
  */
 const readFromBlobOrFile = blob => (
   new Promise((resolve, reject) => {
@@ -29,14 +27,6 @@ const readFromBlobOrFile = blob => (
  * @name loadImage
  * @function load image from different source
  * @access private
- * @param {string, object} image - image source, supported formats:
- *   string: URL string, can be relative path
- *   string: base64 image
- *   img HTMLElement: extract image source from src attribute
- *   video HTMLElement: extract image source from poster attribute
- *   canvas HTMLElement: extract image data by converting to Blob
- *   File instance: data from <input type="file" />
- * @returns {array} binary image in array format
  */
 const loadImage = async (image) => {
   let data = image;
diff --git a/src/worker/browser/send.js b/src/worker/browser/send.js
index de7ed94..88f8aaf 100644
--- a/src/worker/browser/send.js
+++ b/src/worker/browser/send.js
@@ -4,8 +4,6 @@
  * @name send
  * @function send packet to worker and create a job
  * @access public
- * @param {object} instance TesseractWorker instance
- * @param {object} iPacket data for worker
  */
 module.exports = async (worker, packet) => {
   worker.postMessage(packet);
diff --git a/src/worker/browser/spawnWorker.js b/src/worker/browser/spawnWorker.js
index 6622fa0..1a0239c 100644
--- a/src/worker/browser/spawnWorker.js
+++ b/src/worker/browser/spawnWorker.js
@@ -4,9 +4,6 @@
  * @name spawnWorker
  * @function create a new Worker in browser
  * @access public
- * @param {object} options
- * @param {string} options.workerPath - worker script path
- * @param {boolean} options.workerBlobURL - Use a blob:// URL for the worker script
  */
 module.exports = ({ workerPath, workerBlobURL }) => {
   let worker;
diff --git a/src/worker/browser/terminateWorker.js b/src/worker/browser/terminateWorker.js
index 93a38c7..753a3fd 100644
--- a/src/worker/browser/terminateWorker.js
+++ b/src/worker/browser/terminateWorker.js
@@ -4,7 +4,6 @@
  * @name terminateWorker
  * @function terminate worker
  * @access public
- * @param {object} instance TesseractWorker instance
  */
 module.exports = (worker) => {
   worker.terminate();
diff --git a/src/worker/node/loadImage.js b/src/worker/node/loadImage.js
index d4bc77f..91ab15a 100644
--- a/src/worker/node/loadImage.js
+++ b/src/worker/node/loadImage.js
@@ -11,11 +11,6 @@ const readFile = util.promisify(fs.readFile);
  * @name loadImage
  * @function load image from different source
  * @access public
- * @param {string} image - image source, supported formats:
- *   string: URL string or file path
- *   string: base64 image
- *   buffer: image buffer
- * @returns {array} binary image in array format
  */
 module.exports = async (image) => {
   let data = image;
diff --git a/src/worker/node/send.js b/src/worker/node/send.js
index da701d2..783c6e1 100644
--- a/src/worker/node/send.js
+++ b/src/worker/node/send.js
@@ -4,8 +4,6 @@
  * @name send
  * @function send packet to worker and create a job
  * @access public
- * @param {object} instance TesseractWorker instance
- * @param {object} iPacket data for worker
  */
 module.exports = (worker, packet) => {
   worker.send(packet);
diff --git a/src/worker/node/spawnWorker.js b/src/worker/node/spawnWorker.js
index 1dabcd7..e3c5d89 100644
--- a/src/worker/node/spawnWorker.js
+++ b/src/worker/node/spawnWorker.js
@@ -6,9 +6,6 @@ const { fork } = require('child_process');
  * @name spawnWorker
  * @function fork a new process in node
  * @access public
- * @param {object} instance - TesseractWorker instance
- * @param {object} options
- * @param {string} options.workerPath - worker script path
  */
 module.exports = ({ workerPath }) => (
   fork(workerPath)
diff --git a/src/worker/node/terminateWorker.js b/src/worker/node/terminateWorker.js
index 2ee0a78..0e8b67e 100644
--- a/src/worker/node/terminateWorker.js
+++ b/src/worker/node/terminateWorker.js
@@ -4,7 +4,6 @@
  * @name terminateWorker
  * @function kill worker
  * @access public
- * @param {object} instance TesseractWorker instance
  */
 module.exports = (worker) => {
   worker.kill();