Base Type
set
(maths concept) collection of distinct things
Top Type
universal (super-) Type assignable to any Variable
any
(default) untyped anonymous Type, can be literally anything
unknown
Top Type to rep any value but also make it illegal to use (w/o Narrow)
Source: The unknown Type in TypeScript — Marius Schulz
void
Type to rep no return value from function
never
bottom type to rep values never observed (or never return from function)
Typed Object
Type to ref any non-Primitive; as Record or Dictionary
enum
Enumerated set of named constants Type. default numbered. optional string member assign via =
Source: TypeScript: Handbook - Enums
Function Type
Type to annotate Methods & Callback Function with implicit return of any
Numeric Literal Type
fixed set of specific values for number as Type
String Literal Type
fixed set of specific values for string as types
Array
Booleanish
type Booleanish = boolean | 'true' | 'false';