@angular/cli migration - solution-style-tsconfig

Add "Solution Style" TypeScript configuration file support. This improves developer experience using editors powered by TypeScript’s language server. Read more about this here: https://v10.angular.io/guide/migration-solution-style-tsconfig

e2e/tsconfig.json

@@ -1,5 +1,5 @@
 {
-  "extends": "../tsconfig.json",
+  "extends": "../tsconfig.base.json",
   "compilerOptions": {
     "outDir": "../out-tsc/e2e",
     "module": "commonjs",

tsconfig.app.json

@@ -1,5 +1,5 @@
 {
-  "extends": "./tsconfig.json",
+  "extends": "./tsconfig.base.json",
   "compilerOptions": {
     "outDir": "./out-tsc/app",
     "types": []

tsconfig.base.json

@@ -0,0 +1,26 @@
+{
+  "compileOnSave": false,
+  "compilerOptions": {
+    "baseUrl": "./",
+    "outDir": "./dist/out-tsc",
+    "sourceMap": true,
+    "declaration": false,
+    "downlevelIteration": true,
+    "experimentalDecorators": true,
+    "module": "esnext",
+    "moduleResolution": "node",
+    "importHelpers": true,
+    "target": "es2015",
+    "typeRoots": [
+      "node_modules/@types"
+    ],
+    "lib": [
+      "es2018",
+      "dom"
+    ]
+  },
+  "angularCompilerOptions": {
+    "fullTemplateTypeCheck": true,
+    "strictInjectionParameters": true
+  }
+}

tsconfig.json

@@ -1,26 +1,17 @@
+/*
+  This is a "Solution Style" tsconfig.json file, and is used by editors and TypeScript’s language server to improve development experience.
+  It is not intended to be used to perform a compilation.
+
+  To learn more about this file see: https://angular.io/config/solution-tsconfig.
+*/
 {
-  "compileOnSave": false,
-  "compilerOptions": {
-    "baseUrl": "./",
-    "outDir": "./dist/out-tsc",
-    "sourceMap": true,
-    "declaration": false,
-    "downlevelIteration": true,
-    "experimentalDecorators": true,
-    "module": "esnext",
-    "moduleResolution": "node",
-    "importHelpers": true,
-    "target": "es2015",
-    "typeRoots": [
-      "node_modules/@types"
-    ],
-    "lib": [
-      "es2018",
-      "dom"
-    ]
-  },
-  "angularCompilerOptions": {
-    "fullTemplateTypeCheck": true,
-    "strictInjectionParameters": true
-  }
-}
+  "files": [],
+  "references": [
+    {
+      "path": "./tsconfig.app.json"
+    },
+    {
+      "path": "./tsconfig.spec.json"
+    }
+  ]
+}

tsconfig.spec.json

@@ -1,5 +1,5 @@
 {
-  "extends": "./tsconfig.json",
+  "extends": "./tsconfig.base.json",
   "compilerOptions": {
     "outDir": "./out-tsc/spec",
     "types": [