__vue-devtools-plugin-settings__ let currentSettings = { ...defaultSettings };

[panhezeng]

Android 6.0 not support ... object , vue 3 support Android 6.0

vuejs/router#1207

[panhezeng]

node_modules/vuex/dist/vuex.esm-bundler.js import { setupDevtoolsPlugin } from '@vue/devtools-api';
The production model is packaged into the vendor.
The proxy that vue 3 relies on supports at least Chrome 49, Spread syntax in object literals supports at least Chrome 60.

[Ludo-Las]

Same problem here, we have to support Chrome49 and vue router embeds the last vue-devtools api that causes a blank screen
Unexpected token ...
We have fixed the devtools-api versions to beta15 for the moment via a npm-shrinkwrap.json

[bastiW]

The actual problem is that the dependency you are using is not transpiled automatically.

When you are using Vue CLI you need to modify vue.config.js.

So in my case:

   // vue.config.js
module.exports = {
    transpileDependencies: [ 
        "vue-i18n",
        "@vue/devtools-api",
        "vue-router",
        "vue3-markdown-it"
    ]
}

Files inside node modules are not transpiled by default.
https://cli.vuejs.org/core-plugins/babel.html#configuration
I think that default behavior in the past. I am not sure why this was changed.

P. S. In case you are using vite.js you need to add the legacy plugin.