tsconfig.json

{
    "compileOnSave": true,
    "compilerOptions": {
        "newLine": "LF",
        "target": "es2018",
        "module": "commonjs",
        "lib": [
            "es2020",
            "DOM"
        ],
        "removeComments": false,
        "preserveConstEnums": true,
        "sourceMap": false,
        "strict": true
    },
    "files": [
        "./src/util.ts"
    ]
}