Add typescript declaration file

package.json

@@ -3,6 +3,7 @@
   "version": "2.0.0-alpha.15",
   "description": "Pure Javascript Multilingual OCR",
   "main": "src/index.js",
+  "types": "types/index.d.ts",
   "unpkg": "dist/tesseract.min.js",
   "jsdelivr": "dist/tesseract.min.js",
   "scripts": {

types/index.d.ts

@@ -0,0 +1,170 @@
+declare namespace Tesseract {
+  class TesseractWorker {
+    recognize(image: ImageLike, lang: string, options?: Partial<RecognizeOptions>): TesseractJob;
+    detect(image: ImageLike): TesseractJob;
+  }
+  interface RecognizeOptions {
+    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
+    tessjs_create_unlv: string
+    tessjs_create_osd: string
+    tessjs_textonly_pdf: string
+    tessjs_pdf_name: string
+    tessjs_pdf_title: string
+    tessjs_pdf_auto_download: boolean
+    tessjs_pdf_bin: boolean
+    tessjs_image_rectangle_left: number
+    tessjs_image_rectangle_top: number
+    tessjs_image_rectangle_width: number
+    tessjs_image_rectangle_height: number
+  }
+  const enum OEM {
+    TESSERACT_ONLY,
+    LSTM_ONLY,
+    TESSERACT_LSTM_COMBINED,
+    DEFAULT,
+  }
+  const enum PSM {
+    OSD_ONLY = '0',
+    AUTO_OSD = '1',
+    AUTO_ONLY = '2',
+    AUTO = '3',
+    SINGLE_COLUMN = '4',
+    SINGLE_BLOCK_VERT_TEXT = '5',
+    SINGLE_BLOCK = '6',
+    SINGLE_LINE = '7',
+    SINGLE_WORD = '8',
+    SINGLE_CHAR = '9',
+    SPARSE_TEXT = '10',
+    SPARSE_TEXT_OSD = '11',
+    RAW_LINE = '12'
+  }
+  type ImageLike = string | HTMLImageElement | HTMLCanvasElement | HTMLVideoElement
+    | CanvasRenderingContext2D | File | Blob | ImageData | Buffer;
+  interface Progress {
+    status: string;
+    progress: number;
+    loaded?: number;
+  }
+  interface Block {
+    paragraphs: Paragraph;
+    text: string;
+    confidence: number;
+    baseline: Baseline;
+    bbox: Bbox;
+    blocktype: string;
+    polygon: any;
+    page: Page;
+    lines: Line[];
+    words: Word[];
+    symbols: Symbol[];
+  }
+  interface Baseline {
+    x0: number;
+    y0: number;
+    x1: number;
+    y1: number;
+    has_baseline: boolean;
+  }
+  interface Bbox {
+    x0: number;
+    y0: number;
+    x1: number;
+    y1: number;
+  }
+  interface Line {
+    words: Word[];
+    text: string;
+    confidence: number;
+    baseline: Baseline;
+    bbox: Bbox;
+    paragraph: Paragraph;
+    block: Block;
+    page: Page;
+    symbols: Symbol[];
+  }
+  interface Paragraph {
+    lines: Line[];
+    text: string;
+    confidence: number;
+    baseline: Baseline;
+    bbox: Bbox;
+    is_ltr: boolean;
+    block: Block;
+    page: Page;
+    words: Word[];
+    symbols: Symbol[];
+  }
+  interface Symbol {
+    choices: Choice[];
+    image: any;
+    text: string;
+    confidence: number;
+    baseline: Baseline;
+    bbox: Bbox;
+    is_superscript: boolean;
+    is_subscript: boolean;
+    is_dropcap: boolean;
+    word: Word;
+    line: Line;
+    paragraph: Paragraph;
+    block: Block;
+    page: Page;
+  }
+  interface Choice {
+    text: string;
+    confidence: number;
+  }
+  interface Word {
+    symbols: Symbol[];
+    choices: Choice[];
+    text: string;
+    confidence: number;
+    baseline: Baseline;
+    bbox: Bbox;
+    is_numeric: boolean;
+    in_dictionary: boolean;
+    direction: string;
+    language: string;
+    is_bold: boolean;
+    is_italic: boolean;
+    is_underlined: boolean;
+    is_monospace: boolean;
+    is_serif: boolean;
+    is_smallcaps: boolean;
+    font_size: number;
+    font_id: number;
+    font_name: string;
+    line: Line;
+    paragraph: Paragraph;
+    block: Block;
+    page: Page;
+  }
+  interface Page {
+    blocks: Block[];
+    confidence: number;
+    html: string;
+    lines: Line[];
+    oem: string;
+    paragraphs: Paragraph[];
+    psm: string;
+    symbols: Symbol[];
+    text: string;
+    version: string;
+    words: Word[];
+  }
+  interface TesseractJob {
+    then: (callback: (result: Page) => void) => TesseractJob;
+    progress: (callback: (progress: Progress) => void) => TesseractJob;
+    catch: (callback: (error: Error) => void) => TesseractJob;
+    finally: (callback: (resultOrError: Error | Page) => void) => TesseractJob;
+  }
+}
+
+export = Tesseract;
+export as namespace Tesseract;