tesseract.js/src/constants/OEM.js

/*
 * OEM = OCR Engine Mode, and there are 4 possible modes.
 *
 * By default tesseract.js uses LSTM_ONLY mode.
 *
 */
module.exports = {
  TESSERACT_ONLY: 0,
  LSTM_ONLY: 1,
  TESSERACT_LSTM_COMBINED: 2,
  DEFAULT: 3,
};