tsconfig.json

{
    "compilerOptions": {
        "target": "esnext",
        "module": "commonjs",
        "lib": [
            "es6"
        ],
        "noImplicitAny": true,
        "noImplicitThis": true,
        "strictNullChecks": false,
        "baseUrl": "./",
        "moduleResolution": "node",
        "allowJs": true,
        "typeRoots": [
            "./"
        ],
        "types": [
            "node"
        ],
        "forceConsistentCasingInFileNames": true
    },
    "files": [
        "BigInteger.d.ts",
        "spec/tsDefinitions.ts"
    ]
}