Vue 2.7: injection "Symbol(pinia)" not found

[kingyue737]

Reproduction

https://stackblitz.com/edit/vitejs-vite-erhcjk

Steps to reproduce the bug

Open the reproduction link and see the terminal of devtool

Expected behavior

Should not throw any error

Actual behavior

[Vue warn] injection "Symbol(pinia)" not found

Additional information

Doesn't meet this issue with Vue 2.6 + @vue/composition-api

[posva]

More info about this issue: it turns out that getCurrentInstance() is still set during router.beforeEach() which I don't know if it's expected.
The real problem comes from the inject() function checking on the currentInstance.$parent when the currentInstance is actually the root and therefore gives out undefine

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So either the currentInstance should be undefined or it should reach out for the $root if there is no $parent but I don't know which one is the good fix so I didn't submit the PR

[lozinsky]

The real problem comes from the inject() function checking on the currentInstance.$parent when the currentInstance is actually the root and therefore gives out undefined

This causes the issue still reproduces when pinia is used in setup function.

Reproduction: https://stackblitz.com/edit/vitejs-vite-t9sovg