Have you been looking for a low impact way to add Typescript? I wrote a tutorial:https://devblogs.microsoft.com/typescript/how-to-upgrade-to-typescript-without-anybody-noticing-part-1/ …
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I used a similar process for gaining #TypeScript-style type checking in my own JS codebase (~200 files, ~50k lines). -- However to avoid getting swamped with errors I started with checkJs=false and added "// @ts-check" to JS files one-by-one.
