fix: oauth2 not defined by exports

[ted-marozzi]

Webpack 5 generates an error when using the CopyWebpackPlugin to copy the oauth2 redirect page.

    new CopyWebpackPlugin({
      patterns: [{
        // Copy the Swagger OAuth2 redirect file to the project root;
        // that file handles the OAuth2 redirect after authenticating the end-user.
        from: require.resolve('swagger-ui/dist/oauth2-redirect.html'),
        to: './'
      }]
    })

Error

Failed to load '/app/src/docs/webpack.config.js' config
[webpack-cli] Error [ERR_PACKAGE_PATH_NOT_EXPORTED]: Package subpath './dist/oauth2-redirect.html' is not defined by "exports" in /app/src/docs/node_modules/swagger-ui/package.json
    at new NodeError (node:internal/errors:371:5)
    at throwExportsNotFound (node:internal/modules/esm/resolve:453:9)
    at packageExportsResolve (node:internal/modules/esm/resolve:731:3)
    at resolveExports (node:internal/modules/cjs/loader:482:36)
    at Function.Module._findPath (node:internal/modules/cjs/loader:522:31)
    at Function.Module._resolveFilename (node:internal/modules/cjs/loader:919:27)
    at Function.resolve (node:internal/modules/cjs/helpers:108:19)
    at Object.<anonymous> (/app/src/docs/webpack.config.js:43:23)
    at Module._compile (node:internal/modules/cjs/loader:1103:14)
    at Object.Module._extensions..js (node:internal/modules/cjs/loader:1157:10) {
  code: 'ERR_PACKAGE_PATH_NOT_EXPORTED'
}

Description

Marking the file as allowed to be exported in package.json.

Motivation and Context

This change fixes webpack5 with oauth.

How Has This Been Tested?

I changed the package.json in my node modules and reran the build and it succedded.

root@5a8544c102c9:/app/src/docs# npm start

> swagger-ui-webpack-getting-started@0.0.1 start
> webpack-dev-server --open

<i> [webpack-dev-server] Project is running at:
<i> [webpack-dev-server] Loopback: http://localhost:8080/
<i> [webpack-dev-server] Content not from webpack is served from '/app/src/docs/public' directory
<i> [webpack-dev-middleware] wait until bundle finished: /
asset app.bundle.js 11.2 MiB [emitted] (name: app)
asset oauth2-redirect.html 2.63 KiB [emitted] [from: node_modules/swagger-ui/dist/oauth2-redirect.html] [copied]

Screenshots (if appropriate):

Checklist

My PR contains...

• No code changes (src/ is unmodified: changes to documentation, CI, metadata, etc.)
• [] Dependency changes (any modification to dependencies in package.json)
• Bug fixes (non-breaking change which fixes an issue)
• Improvements (misc. changes to existing features)
• Features (non-breaking change which adds functionality)

My changes...

• are breaking changes to a public API (config options, System API, major UI change, etc).
• are breaking changes to a private API (Redux, component props, utility functions, etc.).
• are breaking changes to a developer API (npm script behavior changes, new dev system dependencies, etc).
• are not breaking changes.

Documentation

• My changes do not require a change to the project documentation.
• My changes require a change to the project documentation.
• If yes to above: I have updated the documentation accordingly.

Automated tests

• My changes can not or do not need to be tested.
• My changes can and should be tested by unit and/or integration tests.
• If yes to above: I have added tests to cover my changes.
• If yes to above: I have taken care to cover edge cases in my tests.
• All new and existing tests passed.

[ted-marozzi]

For others that hit this you can do this (dodgy?) workaround.

        {
          // Copy the Swagger OAuth2 redirect file to the project root;
          // that file handles the OAuth2 redirect after authenticating the end-user.
          from: path.join(__dirname, 'node_modules', 'swagger-ui', 'dist', 'oauth2-redirect.html'),
          to: './'
        },

For the maintainers, if we can decide on a solution I will happily update the web-pack-getting-started sample to use the latest dependencies.

[tim-lai]

@ted-marozzi Thanks for the PR! I would prefer updating the samples/webpack-getting-started/webpack.config.js that you cited in the comments, rather than adding the oauth2-redirect.html directly to package.json. The reason is because it appears that most(?) consumers of SwaggerUI do not need a change to package.json, therefore we can limit the change to the sample configuration documentation.

[ted-marozzi]

I think I wasn't clear, this change would need to be merged to update the sample, webpack 5 is incompatible with the sample until this is merged. When it is merged I can update the sample config to use webpack 5

[tim-lai]

@ted-marozzi Ah, thanks for the clarification. PR is now merged! Thanks for the contribution!