chore: version tsconfig.json

See vaadin/flow#15485

Author: javier-godoy

.gitignore

@@ -10,7 +10,6 @@ package.json
 webpack.config.js
 /error-screenshots
 drivers
-tsconfig.json
 .idea
 types.d.ts
 /frontend/generated

tsconfig.json

@@ -0,0 +1,39 @@
+// This TypeScript configuration file is generated by vaadin-maven-plugin.
+// This is needed for TypeScript compiler to compile your TypeScript code in the project.
+// It is recommended to commit this file to the VCS.
+// You might want to change the configurations to fit your preferences
+// For more information about the configurations, please refer to http://www.typescriptlang.org/docs/handbook/tsconfig-json.html
+{
+  "flow_version": "23.3.0",
+  "compilerOptions": {
+    "sourceMap": true,
+    "inlineSources": true,
+    "module": "esNext",
+    "target": "es2020",
+    "moduleResolution": "node",
+    "strict": true,
+    "skipLibCheck": true,
+    "noFallthroughCasesInSwitch": true,
+    "noImplicitReturns": true,
+    "noImplicitAny": true,
+    "noImplicitThis": false,
+    "noUnusedLocals": false,
+    "noUnusedParameters": false,
+    "experimentalDecorators": true,
+    "useDefineForClassFields": false,
+    "baseUrl": "frontend",
+    "paths": {
+      "@vaadin/flow-frontend": ["generated/jar-resources"],
+      "@vaadin/flow-frontend/*": ["generated/jar-resources/*"],
+      "Frontend/*": ["*"]
+    }
+  },
+  "include": [
+    "frontend/**/*.ts",
+    "frontend/index.js",
+    "types.d.ts"
+  ],
+  "exclude": [
+	"frontend/generated/jar-resources"
+  ]
+}