Version 1.2.0 and 1.2.1 give runtime error at startup

[GeekyMonkey]

Version 1.1.5 is fine. But updating to either 1.2.0 or 1.2.1 results in the errors below at startup despite having this loaded in Main.ts. The console log message is displayed before the errors are displayed.

import VueCompositionAPI from "@vue/composition-api";
import Vue from "vue";

console.log("Composition API init");
Vue.use(VueCompositionAPI);

Startup errors:

vue.runtime.esm.js:619 [Vue warn]: Error in mounted hook (Promise/async): "Error: [vue-composition-api] must call Vue.use(VueCompositionAPI) before using any function."

found in

---> <App> at src/App.vue
       <Root>

warn @ vue.runtime.esm.js:619
logError @ vue.runtime.esm.js:1893
globalHandleError @ vue.runtime.esm.js:1888
handleError @ vue.runtime.esm.js:1848
(anonymous) @ vue.runtime.esm.js:1865
Promise.catch (async)
invokeWithErrorHandling @ vue.runtime.esm.js:1865
callHook @ vue.runtime.esm.js:4235
insert @ vue.runtime.esm.js:3158
invokeInsertHook @ vue.runtime.esm.js:6390
patch @ vue.runtime.esm.js:6609
Vue._update @ vue.runtime.esm.js:3960
updateComponent @ vue.runtime.esm.js:4081
get @ vue.runtime.esm.js:4495
Watcher @ vue.runtime.esm.js:4484
mountComponent @ vue.runtime.esm.js:4088
push../node_modules/vue/dist/vue.runtime.esm.js.Vue.$mount @ vue.runtime.esm.js:8459
./src/main.ts @ main.ts:35
__webpack_require__ @ bootstrap:858
fn @ bootstrap:150
1 @ Logout.vue?4cf0:1
__webpack_require__ @ bootstrap:858
checkDeferredModules @ bootstrap:45
(anonymous) @ bootstrap:1039
(anonymous) @ bootstrap:1039
vue.runtime.esm.js:1897 Error: [vue-composition-api] must call Vue.use(VueCompositionAPI) before using any function.
    at assert (vue-composition-api.esm.js:34)
    at getVueConstructor (vue-composition-api.esm.js:315)
    at getWatcherVM (vue-composition-api.esm.js:1132)
    at watch (vue-composition-api.esm.js:1397)
    at index.esm.js:779
    at new Promise (<anonymous>)
    at toMatch (index.esm.js:778)
    at Object.toBeTruthy (index.esm.js:802)
    at App.ts:254

[antfu]

Can you share a minimal reproduction? Thanks.

[dragomirweb]

I get the exact same error running :
@vue/composition-api": "1.2.1
vue": "^2.6.10"

[dragomirweb]

reproduction: updated from 1.0.5 to 1.2.1 no compilation error app throws [vue-composition-api] must call Vue.use(VueCompositionAPI) before using any function.

[Shinigami92]

I'm also affected by this

[Ttou]

got same error

[antfu]

Can't really help without reproduction

[Ttou]

@antfu maybe @vueuse/core cause this error

[mokone91]

Same issue but with different message

v1.1.5 works fine

a bit more info:
we have application (vue2 + @vue/compositon-api) and 2 libs with different build process
first use vue2 + vue-demi and it works
second use vue2 + @vue/compositon-api which externalised by webpack5 'externals' and it doesn't work

for now issue fixed by downgrading @vue/compositon-api on app side to 1.1.5

[RPainter8West]

Back in business! Thanks!

[Shinigami92]

Yes, everything working again 🙂 thx