Cool bug find :) Is it tracked on https://github.com/elm-lang/elm-compiler/issues ?
On Sun, Jul 31, 2016 at 3:01 AM, Aditya Vishwakarma < [email protected]> wrote: > Hi > > So I dug deeper into this issue. turns out that the JS code for my port > module was being emitted before the JS of Json.Decode module. > > After some research, I found that if the project's port module has: > > - Name beginning with a letter before J, and > - does not have a declared dependency on Json.Decode > > Then the elm compiler will emit the port module code before `Json.Decode` > which causes all decoders to be `Undefined`. This results in all user > defined incoming ports to stop throw exceptions. > > SSCCE: https://github.com/adityav/elm-ports-issue > > > On Friday, 29 July 2016 02:27:41 UTC+5:30, Aditya Vishwakarma wrote: >> >> Hi >> >> I am getting Uncaught TypeError: Cannot read property 'tag' of undefined >> in a sample code I built to tryout elm. The error happen when I send JSON >> data across the elm port from JS side. >> >> Port defn: >> https://github.com/adityav/elm-reddit-listing/blob/master/src/AppPorts.elm#L14 >> JS call which causes this issue: >> https://github.com/adityav/elm-reddit-listing/blob/master/src/index.js#L36 >> git repo: https://github.com/adityav/elm-reddit-listing >> >> To run. Simply do >> npm install && elm package install >> npm start >> >> and open http://localhost:8080/. A listing of /r/elm should show up when >> the app works. >> >> A screenshot of the exact location where the error occurs: >> >> >> <https://lh3.googleusercontent.com/-5aH4m9n6gEw/V5pu35oQsEI/AAAAAAAAEbw/QKXJrtSqgcA6-Dfe_BVsDOYPpn9BHl6MACLcB/s1600/Screen%2BShot%2B2016-07-29%2Bat%2B1.39.20%2BAM.png> >> >> People on slack recommended me to remove elm-stuff/build-artifacts and >> try again. It didn't work so I removed node_modules and elm-stuff >> directories and reinstalled the whole thing. Didn't work as well. >> The code was working before I decided to clean it up a little to show to >> my teammates. Stopped working the moment I shared the github link with >> them. :| >> >> anyone got any ideas on this? >> > -- > You received this message because you are subscribed to the Google Groups > "Elm Discuss" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > For more options, visit https://groups.google.com/d/optout. > -- You received this message because you are subscribed to the Google Groups "Elm Discuss" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
