Use TypeScript

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TypeScript is a more strict language that transpiles to JavaScript, like Babel does with ES5+. The main benefit is that typescript also requires the correct types (string, Object, Array, Number to name some), which make the code more robust.

• Add TypeScript
• Convert existing code to TypeScript
• Merge into develop

An alternative would be ES5+ with Flow, in case it is difficult to set up. Flow allows to do type checking by code comments, so the code remains to work without Flow.

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https://github.com/Microsoft/TypeScript-Vue-Starter#typescript-vue-starter

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Working on this right now. I expect this to be finished by the end of the week (June 19, 2020).