tsconfig.json

{
  "compilerOptions": {
    "target": "es6",
    "module": "commonjs",
    "moduleResolution": "node",
    "allowSyntheticDefaultImports": true,
    "allowJs": true,
    "allowUnreachableCode": false,
    "importHelpers": true,
    "alwaysStrict": true,
    "sourceMap": true,
    "forceConsistentCasingInFileNames": true,
    
    "noFallthroughCasesInSwitch": true,
    "noImplicitReturns": true,
    "noUnusedLocals": true,
    "noImplicitAny": true,
    "noImplicitThis": false,

    "strictNullChecks": false,
    "lib": ["es6", "es2018.promise"]
  },
  "include": [
    "src/**/*"
  ]
}