tsconfig.json

{
    "compilerOptions": {
        "baseUrl": ".",
        "target": "es2017",
        "module": "esnext",
        "moduleResolution": "node",
        "emitDecoratorMetadata": false,
        "experimentalDecorators": true,
        "removeComments": false,
        "declaration": true,
        "importHelpers": true,
        "noImplicitAny": true,
        "allowUnreachableCode": false,
        "allowJs": false,
        "alwaysStrict": true,
        "strictNullChecks": true,
        "strictFunctionTypes": true,
        "strictPropertyInitialization": true,
        "strictBindCallApply": true,
        "strict": true,
        "inlineSourceMap": true,
        "inlineSources": true,
        "lib": [
            "esnext",
            "dom",
            "dom.iterable"
        ],
        "skipDefaultLibCheck": true,
        "skipLibCheck": true,
        "rootDir": "src",
        "outDir": "lib"
    },
    "include": [
        "./src/**/*.ts"
    ]
}