tsconfig.json

{
    "compilerOptions": {
        "module": "es2015",
        "target": "esnext",
        "noImplicitAny": true,
        "sourceMap": true,
        "alwaysStrict": true,
        "declaration": true,
        "experimentalDecorators": true,
        "forceConsistentCasingInFileNames": true,
        "importHelpers": true,
        "noImplicitReturns": true,
        "noImplicitThis": true,
        "outDir": "dist/esnext",
        "strictNullChecks": true
    },
    "include": [
        "src/**/*"
    ]
}