Merge pull request #124 from alexandr-g/bug/123

#123 TypeError: Cannot add property noFallthroughCasesInSwitch, object is not extensible

Author: alexandr-g

README.md

@@ -27,7 +27,7 @@ yarn create react-app your-project-name --template typescript-redux
 
 ## Motivation
 
-You know the pain. You start a new project from scratch and need to configure it again and again. It needs routing, ok you setup Router, then you need Redux - ok, oh 😩Redux boilerplate is taking so much time to type. Wait... what if you could have all the tools you want just from the beginning? I want to focus on building amazing projects and not spending hours configuring. That's why I've created this template. It's here for you to use.
+You know the pain. You start a new project from scratch and need to configure it again and again. It needs routing, ok you setup Router, then you need Redux - ok, oh 😩 Redux boilerplate is taking so much time to type. Wait... what if you could have all the tools you want just from the beginning? I want to focus on building amazing projects and not spending hours configuring. That's why I've created this template. It's here for you to use.
 
 ## Available Scripts
 
@@ -83,6 +83,14 @@ The template extends CRA ESLint rules with a custom set, tailored for the reason
 
 Eslint rules are commented for your convenience feel free to tweak or remove them inside `.eslintrc`. No judgment.
 
+## Testing template locally
+
+To test the output of your template locally run
+
+```bash
+npx create-react-app my-app --template file:/\path\to\file
+```
+
 ## How to create custom Create React App (CRA) templates
 
 I created a step by step guide on how to create your own templates.

template/tsconfig.json

@@ -1,11 +1,7 @@
 {
   "compilerOptions": {
     "target": "es5",
-    "lib": [
-      "dom",
-      "dom.iterable",
-      "esnext"
-    ],
+    "lib": ["dom", "dom.iterable", "esnext"],
     "allowJs": true,
     "skipLibCheck": true,
     "esModuleInterop": true,
@@ -17,9 +13,8 @@
     "resolveJsonModule": true,
     "isolatedModules": true,
     "noEmit": true,
-    "jsx": "react"
+    "jsx": "react",
+    "noFallthroughCasesInSwitch": true
   },
-  "include": [
-    "src"
-  ]
+  "include": ["src"]
 }

tsconfig.json

@@ -1,11 +1,7 @@
 {
   "compilerOptions": {
     "target": "es5",
-    "lib": [
-      "dom",
-      "dom.iterable",
-      "esnext"
-    ],
+    "lib": ["dom", "dom.iterable", "esnext"],
     "allowJs": true,
     "skipLibCheck": true,
     "esModuleInterop": true,
@@ -17,9 +13,8 @@
     "resolveJsonModule": true,
     "isolatedModules": true,
     "noEmit": true,
-    "jsx": "react"
+    "jsx": "react",
+    "noFallthroughCasesInSwitch": true
   },
-  "include": [
-    "src"
-  ]
+  "include": ["src"]
 }