`Why does the npm test command in vue2 source code fail with the error "Type ... is not assignable to type ..."?`

After cloning the Vue source code from github using git clone, I proceeded to install dependencies by running yarn. However, when I ran npm test, the test failed. https://i.sstatic.net/aZXBg.png

Does anyone have insight on why this error occurred and how it can be resolved? Thanks :)

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