is undefined 2 javascript-type 2 javascript 2 define-type 2 is string 2 get-type 2 primitive-types 2 is object 2 is number 2 typechecker 2 is array 2 type-checking 2 check-type 2 type-checker 2 type-check 2 is boolean 2 is class 2 is date 2 is null 2 is function 2 what-type 2 plain object 1 plain 1 object 1 number 1 plain objects 1 plain-object 1 plain-objects 1 plainObject 1 primitive 1 pure 1 regex 1 regexp 1 regular expression 1 simple 1 empty keys 1 isEmptyArray 1 isEmptyKeys 1 isEmptyMap 1 isEmptyPlainObject 1 isEmptyWeakMap 1 isError 1 isFunction 1 isMap 1 isNativeClass 1 isNull 1 isNullish 1 isNumber 1 isObject 1 isRegExp 1 isString 1 isSync 1 isSyncFunction 1 isUndefined 1 isWeakMap 1 keys 1 kind 1 map 1 module 1 native 1 native class 1 native-class 1 nativeClass 1 node 1 null 1 ESNext 1 enum-type 1 strict-type 1 multi-type 1 repeated-type-check 1 validator-integration 1 class-check 1 is enum 1 is symbol 1 is BigInt 1 is set 1 is WeakSet 1 is WeakMap 1 is WeakRef 1 is RegExp 1 is Error 1 is RangeError 1 is ReferenceError 1 is SyntaxError 1 is TypeError 1 is Buffer 1 is Promise 1 is JSON 1 is JSON5 1 is empty 1 is notEmpty 1 string 1 sync 1 syncFunction 1 test 1 type 1 typed 1 typeguards 1 typeof 1 types 1