tsconfig.json

{  
  "include": ["src/**/*"],
"compilerOptions": {
    "experimentalDecorators": true,
        /* Visit https://aka.ms/tsconfig.json to read more about this file */

        /* Language and Environment */
        "target": "ES6",
        /* Modules */
        "module": "CommonJS",
        /* Specify what module code is generated. */
        "rootDir": "./src",
        "sourceMap": true,                                /* Create source map files for emitted JavaScript files. */
        // "outFile": "./",                                  /* Specify a file that bundles all outputs into one JavaScript file. If `declaration` is true, also designates a file that bundles all .d.ts output. */
        "outDir": "./build",                                   /* Specify an output folder for all emitted files. */
        "removeComments": true,                           /* Disable emitting comments. */
        "esModuleInterop": true,                             /* Emit additional JavaScript to ease support for importing CommonJS modules. This enables `allowSyntheticDefaultImports` for type compatibility. */
        // "preserveSymlinks": true,                         /* Disable resolving symlinks to their realpath. This correlates to the same flag in node. */
        "forceConsistentCasingInFileNames": true,            /* Ensure that casing is correct in imports. */
        /* Type Checking */
        "strict": true,                                      /* Enable all strict type-checking options. */
        "skipLibCheck": true                                 /* Skip type checking all .d.ts files. */
    }
}