Function isUndefined

docs/pseudo.esm.sh/tinybase@9.0.0/index.js:57–57

(thing)

var isInstanceOf = (thing, cls) => thing instanceof cls;
var isNullish = (thing) => thing == null;
var isUndefined = (thing) => thing === void 0;
var isNull = (thing) => thing === null;
var isTrue = (thing) => thing === true;
var isFalse = (thing) => thing === false;