dependency issue with @vue/composition-api

[eunjae-lee]

Hello, I'm working on supporting both Vue2 and Vue3 in Vue InstantSearch.

I used vue-demi inside Vue InstantSearch. After installing Vue InstantSearch in an empty project, it gives me this error:

 ERROR  Failed to compile with 1 error                              17:19:50

This dependency was not found:

* @vue/composition-api in ./node_modules/vue-demi/lib/index.esm.js

To install it, you can run: npm install --save @vue/composition-api

More details:

In the package.json of Vue InstantSearch,

  "dependencies": {
    "vue-demi": "^0.9.1",
    // ...
  },
  "peerDependencies": {
    "vue": "^2.6.0 || >=3.0.0-rc.0",
    "@vue/composition-api": "^1.0.0-beta.1",
    // ...
  },
  "peerDependenciesMeta": {
    "@vue/composition-api": {
      "optional": true
    }
  },
  "devDependencies": {
    "vue": "2.5.18",
    // ...
  }

You can see the pull request here. And I deployed the temporary build of the pull request via CodeSandbox, which is:

https://pkg.csb.dev/algolia/vue-instantsearch/commit/3341e045/vue-instantsearch

Now I put it in an example:
p9ez8.zip

If you run yarn install && yarn serve it will show the error message above.

In Vue InstantSearch, we do not use @vue/composition-api, so left it as optional. The error message goes away only when I install it as a dependency inside the example.

Do you have any idea? Thanks!

• macOS: 11.3.1
• node: 12.19.0

[antfu]

@vue/composition-api is optional only when using Vue 3, so the user environment should be either:

• vue@2 + @vue/composition-api
• vue@3

[eunjae-lee]

@antfu oh I didn't see that. Do you happen to have a plan to support vue@2 without composition api?

[antfu]

Currently no. vue-demi only make sense when using Composition API. But on the other hand, Vue 2.7 will have the @vue/composition-api plugin builtin, which is planned in Q3 this year.

[eunjae-lee]

@antfu Thanks for the comment. Good to know. I should write something small that does the similar thing as vue-demi.
Have a good day!