See #662 for explanation of Tesseract.js Version 4 changes. List below is auto-generated from commits.
* Added image preprocessing functions (rotate + save images)
* Updated createWorker to be async
* Reworked createWorker to be async and throw errors per #654
* Reworked createWorker to be async and throw errors per #654
* Edited detect to return null when detection fails rather than throwing error per #526
* Updated types per #606 and #580 (#663) (#664)
* Removed unused files
* Added savePDF option to recognize per #488; cleaned up code for linter
* Updated download-pdf example for node to use new savePDF option
* Added OutputFormats option/interface for setting output
* Allowed for Tesseract parameters to be set through recognition options per #665
* Updated docs
* Edited loadLanguage to no longer overwrite cache with data from cache per #666
* Added interface for setting 'init only' options per #613
* Wrapped caching in try block per #609
* Fixed unit tests
* Updated setImage to resolve memory leak per #678
* Added debug output option per #681
* Fixed bug with saving images per #588
* Updated examples
* Updated readme and Tesseract.js-core version
Balearica
Tomasz Ferens
Jerome Wu
Kevin Kwok