// checkObjProps take an untrusted object and a list of typechecks to perform
// and will check that the object adheres to the typechecks. If a type is
// missing or has the wrong type, an error will be returned. This is intended
// to be used to check untrusted objects after they get decoded from JSON. This
// is particularly useful when receiving objects from untrusted entities over
// the network or over postMessage.
//
// Below is an example object, followed by the call that you would make to
// checkObj to verify the object.
//
// const expectedObj = {
//   aNum: 35,
//   aStr: "hi",
//   aBig: 10n,
// };
//
// const err = checkObjProps(expectedObj, [
//   ["aNum", "number"],
//   ["aStr", "string"],
//   ["aBig", "bigint"],
// ]);
//
// Over time, we intend to extend this function to support more types than just
// the default types supported by javascript. For example, we intend to add
// special cases for arrays, and for cryptographic objects.
function checkObjProps(obj, checks) {
    for (let i = 0; i < checks.length; i++) {
        const check = checks[i];
        const type = typeof obj[check[0]];
        if (type !== check[1]) {
            return "check failed, expecting " + check[1] + " got " + type;
        }
    }
    return null;
}
export { checkObjProps };