Fixed %sapper.styles% injection for webpack builds

src/core/create_compilers/WebpackResult.ts

@@ -1,6 +1,6 @@
 import format_messages from 'webpack-format-messages';
 import { CompileResult, BuildInfo, CompileError, Chunk, CssFile } from './interfaces';
-import { ManifestData, Dirs } from '../../interfaces';
+import { ManifestData, Dirs, PageComponent } from '../../interfaces';
 
 const locPattern = /\((\d+):(\d+)\)$/;
 
@@ -66,14 +66,17 @@ export default class WebpackResult implements CompileResult {
 			assets: this.assets,
 			css: {
 				main: extract_css(this.assets.main),
-				chunks: Object
-					.keys(this.assets)
-					.filter(chunkName => chunkName !== 'main')
-					.reduce((chunks: { [key: string]: string }, chukName) => {
-						const assets = this.assets[chukName];
-						chunks[chukName] = extract_css(assets);
-						return chunks;
-					}, {})
+				chunks: manifest_data.components
+                    .reduce((chunks: Record<string, string[]>, component: PageComponent) => {
+                        const css_dependencies = [];
+                        const css = extract_css(this.assets[component.name]);
+
+                        if (css) css_dependencies.push(css);
+
+                        chunks[component.file] = css_dependencies;
+
+                        return chunks;
+                    }, {})
 			}
 		};
 	}
@@ -81,4 +84,4 @@ export default class WebpackResult implements CompileResult {
 	print() {
 		return this.stats.toString({ colors: true });
 	}
-}
+}