Overlayed is built Typescript-first, so you’ll get full type-safety and intellisense when using it. If you’ve never used it and it seems daunting, we promise it’s worth it. Here’s the docs to get you started.
Make sure to enable moduleResolution: "bundler" in your tsconfig.json to ensure intellisense works properly

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Using Javascript

Rest assured, if you prefer to use Javascript, you can do so with no extra changes.