fix: hashed url handling

Had to return `hash` option due to the fact that names generated by `output.assetFileNames` are not awailable in `transform` hook.
Although made it compatible with `assetFileName` placeholder, and assigned Rollup-based default value

README.md

@@ -27,7 +27,7 @@ import styles from "rollup-plugin-styles";
 
 export default {
   output: {
-    // Governs names of CSS files and assets from CSS URLs
+    // Governs names of CSS files (for assets from CSS use `hash` option for url handler)
     // Recommended value shown below
     assetFileNames: "[name]-[hash][extname]",
   },

__tests__/index.test.ts

@@ -20,7 +20,7 @@ validateMany("basic", [
     options: {
       mode: "extract",
       alias: { "@": fixture("resolvers/features2") },
-      url: { publicPath: "/pubpath" },
+      url: { publicPath: "/pubpath", hash: "[name][extname]" },
     },
     outputOpts: {
       assetFileNames: "[name][extname]",

package.json

@@ -87,7 +87,7 @@
     "@typescript-eslint/eslint-plugin": "^2.31.0",
     "@typescript-eslint/parser": "^2.31.0",
     "autoprefixer": "^9.7.6",
-    "babel-jest": "^26.0.0",
+    "babel-jest": "^26.0.1",
     "babel-plugin-transform-node-env-inline": "^0.4.3",
     "builtin-modules": "^3.1.0",
     "eslint": "^6.8.0",
@@ -100,7 +100,7 @@
     "fibers": "^5.0.0",
     "gh-pages": "^2.2.0",
     "husky": "^4.2.5",
-    "jest": "^26.0.0",
+    "jest": "^26.0.1",
     "less": "^3.11.1",
     "lint-staged": "^10.2.2",
     "node-sass": "^4.14.1",