Please provide the following when reporting an issue:

• The version of Turf you are using, and any other relevant versions.
  "@turf/helpers": "^6.5.0",
  "@turf/simplify": "^6.5.0"

• Snippet of source code or for complex examples use jsfiddle.

import simplify from "@turf/simplify";
const turf = require("@turf/helpers");

when using an import statement, i get Could not find a declaration file for module '@turf/simplify'. ts error.
It's the same with all other modules even @turf/turf.

Any ideas/tips?