Bug: error when loading the esm-browser version of the library

[bertBruynooghe]

Description

Error during loading: Right side of assignment cannot be destructured in https://unpkg.com/@vue/test-utils@2.4.2/dist/vue-test-utils.esm-browser.js line 13606

To Reproduce
https://stackblitz.com/edit/web-platform-szhdln?file=styles.css

Expected behavior
Should at least load.

[cexbrayat]

Hi @bertBruynooghe

thanks for the repro

It looks like this is because ssrUtils is not available in the esm-browser version of Vue and VTU uses it for renderToString (the helper function to test the SSR rendering of a component).

We should probably "guard" this renderToString function to avoid shipping it in the esm-browser version of VTU, as Vue does:
https://github.com/vuejs/core/blob/2cece5ba1b9b254cface23096d17ed0e1910467d/packages/runtime-core/src/index.ts#L351

Do you think you could look into and open a PR? We would gladly review it and merge it.

[bertBruynooghe]

We will pick this up somewhere this week. Thanks for the quick reply and the code example!

[Sandbagger]

Hello @cexbrayat,

Thank you once again for your quick response.

I'm picking this up today the PR (currently in WIP) can be found here #2264

In the Vue example that you provided, there is SSR variable. Can I assume that this will be available to Test Utils or should I determine the environment by some other means i.e. check for window?