Upgrading from v1.x
We tried to keep the breaking changes as minimal as possible. As of now, here is the list of the changes we know you'll have to make if you're coming from Modalfy v1:

API

modal.getParams() ➜ modal.getParam()

We drop the support for the generic getParams(defaultValue) in favour of getParam(paramName, defaultValue) which gives us a much more fine-grained control.
getParams() was returning the whole params variable or the defaultValue if we didn't provide any params to the modal. getParam() in the other hand allows us to access every single params key independently (granting params is an object), and defaultValue now applies to that specific key, instead of the whole params object.

backButtonBehavior ➜ backBehavior

This change applies wherever we were defining this key inside modalOptions object. We dropped the Button part as pressing the backdrop now supports backBehavior.

Types

Flow ➜ TypeScript

The library has been completely rewritten from Flow to TypeScript. We deciced to drop support for the former to only pursue with the latter. If you feel like Flow support is essential to you, feel free to submit a PR with updated Flow definitions!

ModalStackOptions ➜ ModalOptions

Given that this type isn't only used when creating the stack, it didn't make sense to include it in the name.

ModalStackItemProp ➜ ModalComponentProp

If you were already using the TypeScript definition files, ModalStackItemProp used in the modal components files has been replaced by ModalComponentProp. Check out its updated section in the TypeScript guide to see how it's used.

ModalProp ➜ ModalProp (with props & params now)

If you were already using the TypeScript definition files, ModalProp used in regular components has been updated by a more complete/simpler to use ModalProp. Check out its updated section in the TypeScript guide to see how it's used.
This guide is a work in progress! As more people upgrade their apps we can continue to improve it. Please send pull requests to add any suggestions that you have from your upgrade experience.
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API
modal.getParams() ➜ modal.getParam()
backButtonBehavior ➜ backBehavior
Types
Flow ➜ TypeScript
ModalStackOptions ➜ ModalOptions
ModalStackItemProp ➜ ModalComponentProp
ModalProp ➜ ModalProp (with props & params now)