tsconfig.json

{
    "compilerOptions": {
        "module": "commonjs",
        "esModuleInterop": true,
        "target": "ES2018",
        "noImplicitAny": true,
        "moduleResolution": "node",
        "sourceMap": true,
        "outDir": "dist/server",
        "baseUrl": "src",
        "forceConsistentCasingInFileNames": true,
        "typeRoots": ["node_modules/@types", "types"],
        "noImplicitUseStrict": true,
        "experimentalDecorators": true /* Enables experimental support for ES7 decorators. */,
        "emitDecoratorMetadata": true /* Enables experimental support for emitting type metadata for decorators. */
    },
    "watchOptions": {
        // Use native file system events for files and directories
        "watchFile": "useFsEvents",
        "watchDirectory": "useFsEvents",
        // Poll files for updates more frequently
        // when they're updated a lot.
        "fallbackPolling": "dynamicPriority"
    },
    "include": ["src/**/*", "src/app.ts"],
    "exclude": ["node_modules/", "client/", "app/"]
}