Trivial port send example: Uncaught TypeError: Cannot read property 'tag' of undefined

[maca]

I am getting this runtime error for the most trivial port send example:

JS:

elmApp.ports.incoming.send("hello")
// #=> Uncaught TypeError: Cannot read property 'tag' of undefined

Elm:

port module Ports exposing (..)

port incoming : (String -> msg)  -> Sub msg

Using: elm 0.18
Browser/OS: Chromium 55/Linux

Gist coming...

[process-bot]

Thanks for the issue! Make sure it satisfies this checklist. My human colleagues will appreciate it!

Here is what to expect next, and if anyone wants to comment, keep these things in mind.

[process-bot]

Thanks for the issue! Make sure it satisfies this checklist. My human colleagues will appreciate it!

Here is what to expect next, and if anyone wants to comment, keep these things in mind.

[maca]

It works fine when I define my main module as a port module and define the ports there, instead of doing it in another file/module.

Feel free to disregard

[maca]

It works fine when I define my main module as a port module and define the ports there, instead of doing it in another file/module.

Feel free to disregard

[aaronjameslang]

This still occurs, specifically if the project's port module has a 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. See https://groups.google.com/forum/#!topic/elm-discuss/Zs5LFb_Ei_4

Edit: Canonical issue appears to be https://github.com/elm-lang/core/issues/703

[aaronjameslang]

This still occurs, specifically if the project's port module has a 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. See https://groups.google.com/forum/#!topic/elm-discuss/Zs5LFb_Ei_4

Edit: Canonical issue appears to be https://github.com/elm-lang/core/issues/703

[FranzSkuffka]

For me this also occurs. Please Re-Open.

[FranzSkuffka]

For me this also occurs. Please Re-Open.

[evancz]

Please make an http://sscce.org/ and open a new issue.

[evancz]

Please make an http://sscce.org/ and open a new issue.