export const isRegExp = (val) => val instanceof RegExp; export const isDate = (val) => val instanceof Date; export const isArray = (val) => Array.isArray(val); export const isBoolean = (val) => typeof val === "boolean"; export const isNull = (val) => val === null; export const isNullOrUndefined = (val) => val === null || val === undefined; export const isNumber = (val) => typeof val === "number"; export const isString = (val) => typeof val === "string"; export const isSymbol = (val) => typeof val === "symbol"; export const isUndefined = (val) => val === undefined; export const isFunction = (val) => typeof val === "function"; export const isBuffer = (val) => { return val && typeof val === "object" && typeof val.copy === "function" && typeof val.fill === "function" && typeof val.readUInt8 === "function"; }; export const isDeepStrictEqual = (a, b) => JSON.stringify(a) === JSON.stringify(b); export const isObject = (val) => val !== null && typeof val === "object" && Object.getPrototypeOf(val).isPrototypeOf(Object); export const isError = (val) => val instanceof Error; export const isPrimitive = (val) => { if (typeof val === "object") { return val === null; } return typeof val !== "function"; };