Typescript error without the .d.ts definition

[totszwai]

When trying to use it under TypeScript environment is throwing these errors.

Could not find a declaration file for module 'highcharts-rounded-corners'. '/home/projects/blah/node_modules/highcharts-rounded-corners/rounded-corners.js' implicitly has an 'any' type. Try npm i --save-dev @types/highcharts-rounded-corners if it exists or add a new declaration (.d.ts) file containing declare module 'highcharts-rounded-corners';ts(7016)