更新到 angular 9 后，我收到警告：
\src\main.ngtypecheck.ts is part of the TypeScript compilation but it's unused.
Add only entry points to the 'files' or 'include' properties in your tsconfig.
\src\polyfills.ngtypecheck.ts is part of the TypeScript compilation but it's unused.
Add only entry points to the 'files' or 'include' properties in your tsconfig.
我的 tsconfig.app.json：
{
"extends": "../tsconfig.json",
"compilerOptions": {
"outDir": "../out-tsc/app",
"types": []
},
"files": ["main.ts", "polyfills.ts"],
"exclude": [
"test.ts",
"**/*.spec.ts"
]
}
如何解决这些警告？