Doesn't work with ESM

[Trojaner]

Version

4.0.4

Reproduction link

https://plnkr.co/edit/0TYlxtktHJ1MszrL

Steps to reproduce

1. Open repro link
2. Observe error in console

What is expected?

App should show and not generate an error

What is actually happening?

vue.esm-browser.prod.js?module:1 TypeError: Cannot read property 'parent' of null
    at warnDeprecatedUsage (vue-router.esm.js?module:2152)
    at setup (vue-router.esm.js?module:2071)
    at kt (vue.esm-browser.prod.js?module:1)
    at vue.esm-browser.prod.js?module:1
    at vue.esm-browser.prod.js?module:1
    at B (vue.esm-browser.prod.js?module:1)
    at O (vue.esm-browser.prod.js?module:1)
    at b (vue.esm-browser.prod.js?module:1)
    at E (vue.esm-browser.prod.js?module:1)
    at T (vue.esm-browser.prod.js?module:1)

Related code (instance is null here):

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• Recreated Doesn't work with ESM #787 since it was missing online repro
• Tested with es-module-shims and Chrome's own ESM implementation, both resulted in the same error
• This is not related to ESM browser module distribution depends on unsupported import #694

[posva]

It's https://unpkg.com/vue-router@4.0.4/dist/vue-router.esm-browser.js. The esm one is a leftover that hasn't been removed. Directly importing from https://unpkg.com/vue-router@4.0.4/dist/vue-router.esm-browser.js?module seems to correct the imports. Proposals are welcome at #694

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[Trojaner]

Thank you