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It’s unlikely you’ll be able to use the full Vue SPA npm toolchain that the vue-spa Project Template uses.
The easiest options is either to use Parcel’s built-in Vue support or adopt the npm-free approach that the vue-lite Project Template by using a local copy of all the pre-compiled vue libraries in your App.
The vue-lite template uses a server bundled solution which uses the optimal unminified sources whilst debugging and the minified bundled sources in Production.
Source:stackexchange.com