purescript-signal-time-travel

A time travel debugger for purescript-signal

usage

Provide your channel and the update function that you want to wrap to the initialize function:

timeTravel <- TimeTravel.initialize channel update

And use the wrapped update function provided by the timeTravel object instead of your original one:

foldp timeTravel.update initialState (Channel.subscribe channel)

The wrapped update function captures the action and state transitions to create the time travel debugger breadcrumb. It will update the signal like your original update function would.

The prev and next functions move back and forth along the breadcrumb. When these functions are used, the app transitions to that given action and state, the pointer is updated to reflect the current position on the breadcrumb, and it will not push values onto the breadcrumb. In contrast, actions that do not come from the prev and next functions, such as normal actions sent from your app, will be pushed onto the breadcrumb, and the pointer will be moved to the end of the breadcrumb.

See the purescript-starter-template for a simple example use case.

license

Licensed under the MIT license