tsconfig.json

{
  "compilerOptions": {
    "lib": ["es2017", "dom"],
    "module": "commonjs",
    "target": "es6",
    "moduleResolution": "node",
    "sourceMap": false,
    "outDir": "dist",
    "baseUrl": ".",
    "paths": {
      "*": [
        "node_modules/*",
        "src/types/*"
      ]
    },
    "emitDecoratorMetadata": true,
    "experimentalDecorators": true
  },
    "include": [
        "src/**/*"
    ],
    /// Added TS Strictness
    "strict": true                        /* Enable all strict type-checking options. */,
    "noImplicitAny": true                 /* Raise error on expressions and declarations with an implied 'any' type. */,
    "strictNullChecks": true              /* Enable strict null checks. */,
    "strictFunctionTypes": true           /* Enable strict checking of function types. */,
    "strictPropertyInitialization": true  /* Enable strict checking of property initialization in classes. */,
    "noImplicitThis": true                /* Raise error on 'this' expressions with an implied 'any' type. */,
    "alwaysStrict": true                  /* Parse in strict mode and emit "use strict" for each source file. */,
    "noUnusedLocals": true                /* Report errors on unused locals. */,
    "noUnusedParameters": true            /* Report errors on unused parameters. */,
    "noImplicitReturns": true             /* Report error when not all code paths in function return a value. */,
    "noFallthroughCasesInSwitch": true    /* Report errors for fallthrough cases in switch statement. */
}