Let's consider a scenario where there is an abstract class:
type Pair = [string, number]
abstract class AbstractPairClass {
pairs: Pair[]
}
When attempting to implement this class as follows:
class ConcretePairClass implements AbstractPairClass {
public pairs = [
['apple', 5],
['banana', 2]
]
}
An error '
(string | number)[][] is not assignable to Pair[]To make sure the types are compatible, specify them explicitly:
type Tuple = [string, number]
abstract class AbstractData {
data: Tuple[] = null as any
}
class ConcreteData implements AbstractData {
public data: Tuple[] = [
['apple', 5],
['banana', 6]
]
}
ConcreteData's data property is mutable, which can cause TypeScript to question its assignability to the abstract class' data type.
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