tsconfig.json

{
    "compilerOptions": {
        "module": "commonjs",
        "target": "es2017",
        "outDir": "out",
        "lib": [
            "es2017"
        ],
        "sourceMap": true,
        "rootDir": ".",
        /* Strict Type-Checking Option */
        "strict": true,   /* enable all strict type-checking options */
        "strictNullChecks": true,
        "strictPropertyInitialization": true,
        "strictFunctionTypes": true,
        "alwaysStrict": true,
        /* Additional Checks */
        "noUnusedLocals": true /* Report errors on unused locals. */
        // "noImplicitReturns": true, /* Report error when not all code paths in function return a value. */
        // "noFallthroughCasesInSwitch": true, /* Report errors for fallthrough cases in switch statement. */
        // "noUnusedParameters": true,  /* Report errors on unused parameters. */
    },
    "exclude": [
        "node_modules",
        ".vscode-test"
    ]
}