What is type Alias in Kotlin?

2

Type aliases provide alternative names for existing types. […] It’s useful to shorten long generic types
Source: https://kotlinlang.org/docs/reference/type-aliases.html

Just as its name implies, they are aliases you can use to refer to a type.
For example, this two pieces of code are equivalent:

fun isValid(predicate: (String) -> Boolean) {
    TODO("Something")
}

typealias Predicate = (String) -> Boolean

fun isValid(predicate: Predicate) {
    TODO("Something")
}
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