Vue fails to mount in environments that don't provide window.SVGElement

[xinix]

Version

3.0.11

Reproduction link

https://github.com/xinix/vue3-svg-bug

Steps to reproduce

Create a sample Vue3 app with Vue UI:

vue create demo

Select the following:

• Manually select features
• Choose Vue 3.x (preview)
• Class-style syntax? No
• Unit testing solution: Mocha

npm install 
npm run test:unit

What is expected?

Sample test to run

What is actually happening?

An error is thrown:

ReferenceError: SVGElement is not defined
    at Object.app.mount (dist/js/webpack:/node_modules/@vue/runtime-dom/dist/runtime-dom.esm-bundler.js:1259:1)
    at mount (dist/js/webpack:/node_modules/@vue/test-utils/dist/vue-test-utils.esm-bundler.js:2310:1)
    at shallowMount (dist/js/webpack:/node_modules/@vue/test-utils/dist/vue-test-utils.esm-bundler.js:2329:1)
    at Context.<anonymous> (dist/js/webpack:/tests/unit/example.spec.ts:8:1)
    at processImmediate (internal/timers.js:461:21)

[LinusBorg]

vuejs/vue-cli#6400

Will be fixed in the next version of the mocha vue cli plugin.

[LinusBorg]

On second though, we might want to consider making this more robust in Vue core. I'll reopen for further evalution.

[HcySunYang]

Does this really need a fix? For runtime-dom, we assume that it runs in a standard browser environment.

[LinusBorg]

Probably not. Wanted to check out why it was a problem on vue-cli durting testing with mocha though, before I close it.

[fangbinwei]

I think it's similar to #2943