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@hailwood
Created June 13, 2018 03:42
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Typescript: Exclusive Or properties
type ExcludeXORIncludeXORNeither<T extends Serializer<T>> =
| { exclude: object; include?: never; }
| { exclude?: never; include: object; }
| { exclude?: never; include?: never; };
abstract class Serializer<T extends Serializer<T> & ExcludeXORIncludeXORNeither<T>> {
exclude?: object;
include?: object;
}
class FooSerializer extends Serializer<FooSerializer> {
// error
exclude = {
foo: true,
}
include = {
bar: true,
}
}
class BazSerializer extends Serializer<BazSerializer> {
// ok
exclude = {
foo: true,
}
}
class BarSerializer extends Serializer<BarSerializer> {
// ok
include = {
bar: true,
}
}
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