`express-serve-static-core` and `serve-static` should be an explicit (optional) dependencies if their types are part of export

[wegry]

Bug report

Actual Behavior

With Webpack-dev-server@4.9.0, typescript@4.7.2, and yarn@3.2.1

$ yarn tsc

.yarn/__virtual__/webpack-dev-server-virtual-ca9edd4c98/2/.yarn/berry/cache/webpack-dev-server-npm-4.9.0-35850a5f47-8.zip/node_modules/webpack-dev-server/types/lib/Server.d.ts:3197:18 - error TS2307: Cannot find module 'express-serve-static-core' or its corresponding type declarations.

3197           import("express-serve-static-core").ParamsDictionary,
                      ~~~~~~~~~~~~~~~~~~~~~~~~~~~

.yarn/__virtual__/webpack-dev-server-virtual-ca9edd4c98/2/.yarn/berry/cache/webpack-dev-server-npm-4.9.0-35850a5f47-8.zip/node_modules/webpack-dev-server/types/lib/Server.d.ts:3428:18 - error TS2307: Cannot find module 'express-serve-static-core' or its corresponding type declarations.

3428           import("express-serve-static-core").ParamsDictionary,
                      ~~~~~~~~~~~~~~~~~~~~~~~~~~~

.yarn/__virtual__/webpack-dev-server-virtual-ca9edd4c98/2/.yarn/berry/cache/webpack-dev-server-npm-4.9.0-35850a5f47-8.zip/node_modules/webpack-dev-server/types/lib/Server.d.ts:3523:34 - error TS2307: Cannot find module 'serve-static' or its corresponding type declarations.

3523 type ServeStaticOptions = import("serve-static").ServeStaticOptions;
                                      ~~~~~~~~~~~~~~

.yarn/__virtual__/webpack-dev-server-virtual-ca9edd4c98/2/.yarn/berry/cache/webpack-dev-server-npm-4.9.0-35850a5f47-8.zip/node_modules/webpack-dev-server/types/lib/Server.d.ts:3556:14 - error TS2307: Cannot find module 'serve-static' or its corresponding type declarations.

3556     | import("serve-static").ServeStaticOptions<import("http").ServerResponse>
                  ~~~~~~~~~~~~~~

[9:29:45 AM] Found 4 errors. Watching for file changes.

Expected Behavior

tsc should compile without error. @types/express-serve-static-core and @types/serve-static should be an explicit (optional) dependencies if their types are part of export.

How Do We Reproduce?

I'll try and create a repro repo later today.

Please paste the results of npx webpack-cli info here, and mention other relevant information

[wegry]

Adding

# .yarnrc.yaml
packageExtensions:
  # Missing dependencies that are part of types
  webpack-dev-server@^4.9.0:
    dependencies:
      "@types/express-serve-static-core": '^4.17.18'
      "@types/serve-static": '1.13.0'

Gets me down to

.yarn/__virtual__/webpack-dev-server-virtual-ca9edd4c98/2/.yarn/berry/cache/webpack-dev-server-npm-4.9.0-35850a5f47-8.zip/node_modules/webpack-dev-server/types/lib/Server.d.ts:3556:7 - error TS2315: Type 'ServeStaticOptions' is not generic.

3556     | import("serve-static").ServeStaticOptions<import("http").ServerResponse>
           ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

[9:47:52 AM] Found 1 error. Watching for file changes.

edit: @types/serve-static@1.13.0 is the correct version for webpack-dev-server@4.9.0. This removes the error.

[alexander-akait]

We don't use @types/express-serve-static-core directly, so it should not be, but yes serve-static should be in our deps, feel free to send a PR

[wegry]

With #4468,

.yarn/__virtual__/webpack-dev-server-virtual-183572c3b6/0/cache/webpack-dev-server-npm-4.9.2-741b789a9c-201e28445f.zip/node_modules/webpack-dev-server/types/lib/Server.d.ts:3197:18 - error TS2307: Cannot find module 'express-serve-static-core' or its corresponding type declarations.

3197           import("express-serve-static-core").ParamsDictionary,
                      ~~~~~~~~~~~~~~~~~~~~~~~~~~~

.yarn/__virtual__/webpack-dev-server-virtual-183572c3b6/0/cache/webpack-dev-server-npm-4.9.2-741b789a9c-201e28445f.zip/node_modules/webpack-dev-server/types/lib/Server.d.ts:3420:18 - error TS2307: Cannot find module 'express-serve-static-core' or its corresponding type declarations.

3420           import("express-serve-static-core").ParamsDictionary,
                      ~~~~~~~~~~~~~~~~~~~~~~~~~~~

Is still failing.

[vonagam]

Just encountered. So, can @types/express-serve-static-core be added as a dependency or maybe ParamsDictionary import can be replaced with simple { [key: string]: string } (which it is)?