Namespace 'cssnanoPlugin' has no exported member 'CssNanoOptions'

[jslott2sigma]

I'm getting the following error when running the typescript compiler on a project that uses this library:

$ yarn tsc --skipLibCheck false
node_modules/rollup-plugin-styles/dist/index.d.ts:337:34 - error TS2694: Namespace 'cssnanoPlugin' has no exported member 'CssNanoOptions'.

337     minimize?: boolean | cssnano.CssNanoOptions;
                                     ~~~~~~~~~~~~~~

Has anyone else seen this? I looked at the cssnano project and couldn't find any reference to CssNanoOptions.