Re-add linting for styled-components

- Update styled-components to v6
- Update stylelint to v15
- Add styled-components css plugin

.erb/configs/webpack.config.base.ts

@@ -7,53 +7,58 @@ import { dependencies as externals } from '../../release/app/package.json';
 import webpackPaths from './webpack.paths';
 import { TsconfigPathsPlugin } from 'tsconfig-paths-webpack-plugin';
 
+const createStyledComponentsTransformer = require('typescript-plugin-styled-components').default;
+
+const styledComponentsTransformer = createStyledComponentsTransformer();
+
 const configuration: webpack.Configuration = {
-  externals: [...Object.keys(externals || {})],
+    externals: [...Object.keys(externals || {})],
 
-  module: {
-    rules: [
-      {
-        exclude: /node_modules/,
-        test: /\.[jt]sx?$/,
-        use: {
-          loader: 'ts-loader',
-          options: {
-            // Remove this line to enable type checking in webpack builds
-            transpileOnly: true,
-          },
+    module: {
+        rules: [
+            {
+                exclude: /node_modules/,
+                test: /\.[jt]sx?$/,
+                use: {
+                    loader: 'ts-loader',
+                    options: {
+                        // Remove this line to enable type checking in webpack builds
+                        transpileOnly: true,
+                        getCustomTransformers: () => ({ before: [styledComponentsTransformer] }),
+                    },
+                },
+            },
+        ],
+    },
+
+    output: {
+        // https://github.com/webpack/webpack/issues/1114
+        library: {
+            type: 'commonjs2',
         },
-      },
+
+        path: webpackPaths.srcPath,
+    },
+
+    plugins: [
+        new webpack.EnvironmentPlugin({
+            NODE_ENV: 'production',
+        }),
     ],
-  },
 
-  output: {
-    // https://github.com/webpack/webpack/issues/1114
-    library: {
-      type: 'commonjs2',
+    /**
+     * Determine the array of extensions that should be used to resolve modules.
+     */
+    resolve: {
+        extensions: ['.js', '.jsx', '.json', '.ts', '.tsx'],
+        fallback: {
+            child_process: false,
+        },
+        plugins: [new TsconfigPathsPlugin({ baseUrl: webpackPaths.srcPath })],
+        modules: [webpackPaths.srcPath, 'node_modules'],
     },
 
-    path: webpackPaths.srcPath,
-  },
-
-  plugins: [
-    new webpack.EnvironmentPlugin({
-      NODE_ENV: 'production',
-    }),
-  ],
-
-  /**
-   * Determine the array of extensions that should be used to resolve modules.
-   */
-  resolve: {
-    extensions: ['.js', '.jsx', '.json', '.ts', '.tsx'],
-    fallback: {
-      child_process: false,
-    },
-    plugins: [new TsconfigPathsPlugin({ baseUrl: webpackPaths.srcPath })],
-    modules: [webpackPaths.srcPath, 'node_modules'],
-  },
-
-  stats: 'errors-only',
+    stats: 'errors-only',
 };
 
 export default configuration;