tsconfig.json

{
    "compilerOptions": {
        "sourceMap": false,
        "removeComments": true,
        "noImplicitAny": true,
        "noImplicitThis": true,
        "noImplicitReturns": true,
        "strictNullChecks": true,
        "noImplicitUseStrict": true,
        "types": [
            "jest",
            "node"
        ],
        "module": "esnext",
        "esModuleInterop": true,
        "target": "ES6",
        "rootDir": "./",
        "allowUnusedLabels": false,
        "noUnusedLocals": true,
        "strictFunctionTypes": true,
        "moduleResolution": "node",
        "importHelpers": true,
        "traceResolution": false,
        "lib": [
            "es5",
            "es2015.promise",
            "es2017.object",
            "dom",
            "scripthost",
            "es2015",
            "es2015.collection",
            "es2015.proxy"
        ],
        // "incremental": true,
        "allowSyntheticDefaultImports": true,
        "baseUrl": ".",
        "paths": {
            "*": ["node_modules/*"]
        },
    },
    "exclude": [
        "node_modules",
        "bin",
        "test/fixtures",
        "*.config.js"
    ]
}