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Not sure if this solves the original problem but if you’re not using Vue CLI (or even npm packages) and are pulling in the Vue library via a CDN, you could try:
const Vue = (window as any).Vue;
at the top of your .ts file instead of an import.
It’s a bit hacky since your not getting any typing information for Vue (that said, it’s not much of a loss for Vue version 2) but it might get you going.
Source:stackexchange.com