Warning: Multiple instances of Vue detected!

I’m using electron-vue and bootstrap-vue and getting the warning “Multiple instances of Vue detected!”.

Whole warning message:

D:\temp\test1\node_m…ap-vue.common.js:80 [BootstrapVue warn]: Multiple instances of Vue detected!
See: https://bootstrap-vue.js.org/docs#using-module-bundlers
warn	@	D:\temp\test1\node_m…ap-vue.common.js:80
checkMultipleVue	@	D:\temp\test1\node_m…-vue.common.js:1413
install	@	D:\temp\test1\node_m…-vue.common.js:1437
Vue.use	@	vue.esm.js?a026:5110
install	@	D:\temp\test1\node_m…vue.common.js:23791
Vue.use	@	vue.esm.js?a026:5110
(anonymous)	@	main.js?cebd:9
./src/renderer/main.js	@	renderer.js:2652
__webpack_require__	@	renderer.js:725
fn	@	renderer.js:102
0	@	renderer.js:2723
__webpack_require__	@	renderer.js:725
(anonymous)	@	renderer.js:792
(anonymous)	@	renderer.js:795

I’m a js beginner and for me it is not obvious where the other vue instance(s) are generated and how I can remove or suppress them?

[tmorehouse]

@SergioFloresG @groboter I noticed this comment in another library comment regarding electron https://github.com/vuetifyjs/vuetify/issues/4068#issuecomment-491091793 by @DanWithams:

Search electron project files for the variable “whiteListedModules”, I found it in .electron-vue/webpack.renderer.config.js

let whiteListedModules = [‘vue’]

In my scenario, I had added bootstrap-vue package to my project and whenever I was interacting with vue components supplied from bootstrap-vue I was encountering the error, this means that the bootstrap-vue was loading in the second instance of Vue which causes the $attr readonly errors and similar errors.

In order prevent you application having two instances of Vue, you need to add the offending package into the whiteListedModules array, along with vue:

let whiteListedModules = [‘vue’, ‘bootstrap-vue’]

Now I do not get the $attr readonly errors or anything else, and vue and bootstrap vue run fine.

[groboter]

For me the magic Vue.use(require('bootstrap-vue/dist/bootstrap-vue.common.min')); also works.