I'm trying to create a class property that can be used to define another type:
class TypeOne {
public static readonly key: string = 'key';
}
class TypeTwo { public [TypeOne.key]: TypeOne }
But it shows this error:
A computed property name in a class property declaration must have a simple literal type or a 'unique symbol'
It works fine with the constant value of an enum:
enum TypeThree {
key = 'key'
}
class TypeFour { public [TypeThree.key]: TypeThree }
Is there any way to set a constant value on a class so that the compiler can accept it as an immutable key and understand the field name?
Get rid of the string annotation:
class TypeOne {
public static readonly key = 'key';
}
class TypeTwo { public [TypeOne.key]: TypeOne }
TS needs a literal type for the property name, string is too broad.
You can simply define TypeOne as:
class TypeOne {
public static readonly key = 'key'; // Remove the string annotation
}
This makes the value of key constant which is the literal string 'key', since this is a unique value the compiler won't complain