Should downgrade to typescript@~3.5

[kevinmarrec]

Description

Should downgrade from typescript@3.6.2 to typescript@~3.5 for now, cause of broken Vue types around 3.6 (vuejs/vue#10455 ~ microsoft/TypeScript#33164)

Solution

Downgrade TypeScript to 3.5.x for now and pin to patch version only (~3.5 tilde range) to prevent the breaking changes that TypeScript minor versions bring.

Then when the type issues for Vue will be fixed through a 3.6 patch release, switch to pinned patch versions only of 3.6.x (~3.6 tilde range).