Broken type annotations (missing @types/node and postcss-modules in dependencies)

[allisonkarlitskaya]

When running tsc on our project, I get the following errors:

node_modules/esbuild-sass-plugin/lib/utils.d.ts:3:34 - error TS2307: Cannot find module 'postcss-modules' or its corresponding type declarations.

3 import PostcssModulesPlugin from 'postcss-modules';
                                   ~~~~~~~~~~~~~~~~~

node_modules/sass/types/legacy/render.d.ts:26:8 - error TS2580: Cannot find name 'Buffer'. Do you need to install type definitions for node? Try `npm i --save-dev @types/node`.

26   css: Buffer;
          ~~~~~~

node_modules/sass/types/legacy/render.d.ts:56:9 - error TS2580: Cannot find name 'Buffer'. Do you need to install type definitions for node? Try `npm i --save-dev @types/node`.

56   map?: Buffer;
           ~~~~~~

Those go away if I npm i @types/node postcss-modules.

Both of those are included in the devDependencies of esbuild-sass-plugin, but since they are referred to from public type declaration files shipped with the package, they need to be moved to dependencies.

The alternative would be to avoid those being mentioned in the relevant .d.ts files.