tsconfig.json

{
  "compilerOptions": {
    "target": "es6",                                  /* Set the JavaScript language version for emitted JavaScript and include compatible library declarations. */
    "module": "commonjs",                                /* Specify what module code is generated. */
    "rootDir": "./",                                  /* Specify the root folder within your source files. */
    "moduleResolution": "node",                       /* Specify how TypeScript looks up a file from a given module specifier. */
    "baseUrl": "./",                               /* Specify the base directory to resolve non-relative module names. */
    "outDir": "build",
    "esModuleInterop": true,
    "paths": {
      "*": [ "node_modules/*" ]
    },                                      /* Specify a set of entries that re-map imports to additional lookup locations. */
    "resolveJsonModule": true,                        /* Enable importing .json files */
    "sourceMap": true,                                /* Create source map files for emitted JavaScript files. */
    "forceConsistentCasingInFileNames": true,            /* Ensure that casing is correct in imports. */
    "strict": true,                                      /* Enable all strict type-checking options. */
    "noImplicitAny": true,                            /* Enable error reporting for expressions and declarations with an implied `any` type.. */
    "strictNullChecks": true,                         /* When type checking, take into account `null` and `undefined`. */
    "strictFunctionTypes": true,                      /* When assigning functions, check to ensure parameters and the return values are subtype-compatible. */
    "useUnknownInCatchVariables": true,               /* Type catch clause variables as 'unknown' instead of 'any'. */
    "skipLibCheck": true,
    "emitDecoratorMetadata": true,
    "experimentalDecorators": true,
  },
  "include": [
    "src/**/*"
  ],
  "exclude": [
    "src/build"
  ]
}