Comment by mbostock

Thanks for the feedback. We implemented the transform to strip TypeScript annotations (using esbuild)…

https://github.com/observablehq/framework/pull/129

but this approach stalled because it doesn’t implement validation of TypeScript: the TypeScript annotations are simply ignored. I felt this defeats the point of using TypeScript. We probably need to use tsc instead of esbuild to get type checking. Hints welcome!