mithril stream .map does not trigger next stream value

[foxdonut]

Mithril version:

2.0.4

Browser and OS:

Chrome on Mac OSX

Project:

Meiosis

Steps to Reproduce

• Create an update stream
• Create a states stream by scanning the `update stream
• Call states.map(state => effect(state) where effect triggers another update

Expected Behavior

• Expect the effect function to be called again
• Here is a flems showing the expected behavior
• Notice the output on the console:
  • { route: 'Home', routeChanged: true, data: [] }
  • { route: 'Home', routeChanged: false, data: [], loading: true }
  • { route: 'Home', routeChanged: false, data: [ 'duck', 'quack' ], loading: false }

Current Behavior

• The effect function is not called again
• Here is a flems showing the current behavior
• Notice the output on the console:
  • { route: 'Home', routeChanged: true, data: [] }
  • { route: 'Home', routeChanged: false, data: [], loading: true }
• The third state is missing because the effect function should have been called again, but it is not.

Context

This is to set up the Meiosis pattern with Effects.

Note: This commit fixes the same issue in Meiosis-Setup's simple-stream.

[pygy]

@foxdonut have you investigated how to fix this?

[foxdonut]

@pygy yes, see the last line of my description above, there is a link to a commit showing how I fixed it in simple-stream. I figure the fix should be similar in mithril stream.

[pygy]

Thanks, I'll have to dig into that then :-) (unless you beat me to a PR)

[ericop]

@pygy here is a working flems based on @foxdonut example. I tried making a PR, but with other changes in the next branch were beyond my wizardry to make play nice together.