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Actions not recognized when using ActionTree #1461

farzadmf opened this Issue Nov 28, 2018 · 3 comments


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farzadmf commented Nov 28, 2018



Reproduction link

Steps to reproduce

There's no need to run anything, just open the repo in VSCode, and you will see the error. I've added comments to make it clear

What is expected?

When I create an ActionTree<...>, I should be able to call my individual Actions on it

What is actually happening?

When I type my actions to be of type ActionTree<...>, then when I call my action(s), I see the error of "no compatible call signatures"

I've created constants to be used as names for my actions (so that I don't use strings). At first, I though that is what's causing the problem; that's why I created the 'hello()' function to test, and it seems to me the constants are not an issue here.


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ktsn commented Dec 2, 2018

Action type (which is a value of ActionTree object) is a union type of action handler (a function) and action object which is added via #941. You need to manually narrow the type when you annotate your action with ActionTree.

const action = typeSafeActions.hello as Function

@ktsn ktsn closed this Dec 2, 2018


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farzadmf commented Dec 2, 2018

Thank you @ktsn for your answer. I don't know if I'm missing something here, but I found it too much of a hassle if every time I need to manually specify the type of my action to be able to test them.

Just casting as Function won't work here because my actions need to take an ActionContext<S, R> as the first argument and payload: any as the second argument. It would be much nicer if TypeScript would infer those for me, and I didn't have to manually specify them.


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farzadmf commented Dec 4, 2018

@kktsn Can you please provide some reference on how to test vuex actions in TypeScript. I saw that there's a type ActionHandler<S, R> (as you mentioned), so I thought maybe I can cast what I have to that, but unfortunately, it's not exported, so I cannot access it.
Of course I can copy/paste what's there and create my own type, but wouldn't it make more sense to use what's already there?

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