fix(package): makes sure the latest casl works with Angular 8.x

Relates to #337

packages/casl-ability/index.metadata.json

@@ -0,0 +1,7 @@
+{
+  "__symbolic": "module",
+  "version": 4,
+  "metadata": {},
+  "origins": {},
+  "importAs": "@casl/ability"
+}

packages/casl-ability/package.json

@@ -19,7 +19,7 @@
   "scripts": {
     "build.core": "rollup -c ../../rollup.config.js -n casl -g sift:sift",
     "build.extra": "rollup -c ../../rollup.config.js -i src/extra.ts -n casl.extra",
-    "build.types": "rm -rf ./dist/types/* && tsc",
+    "build.types": "rm -rf dist/types/* && tsc && cp index.metadata.json dist/types",
     "build": "npm run build.types && npm run build.core && npm run build.extra",
     "lint": "eslint --ext .js,.ts src/ spec/",
     "test": "NODE_ENV=test jest --config ../../tools/jest.config.js --env node",
@@ -75,4 +75,4 @@
     "*.d.ts",
     "extra"
   ]
-}
+}

packages/casl-angular/package.json

@@ -5,7 +5,7 @@
   "main": "dist/umd/index.js",
   "module": "dist/es5m/index.js",
   "es2015": "dist/es6/index.js",
-  "typings": "dist/types/index.d.ts",
+  "typings": "dist/types/public_api.d.ts",
   "repository": {
     "type": "git",
     "url": "https://github.com/stalniy/casl.git"
@@ -88,4 +88,4 @@
     "dist",
     "*.d.ts"
   ]
-}
+}

packages/casl-angular/tsconfig.json

@@ -23,6 +23,8 @@
     "enableIvy": false,
     "skipMetadataEmit": true,
     "skipTemplateCodegen": true,
-    "strictInjectionParameters": true
+    "strictInjectionParameters": true,
+    "flatModuleOutFile": "public_api.js",
+    "flatModuleId": "@casl/angular"
   }
-}
+}