The setup includes an enum and interface as shown below:
enum MyEnum {
ALL, OTHER
}
interface Props {
sources: Omit<MyEnum, MyEnum.ALL>
}
const test: Props = { sources: MyEnum.ALL } // triggering a complaint intentionally
I am perplexed by the fact that MyEnum.All is not being omitted. Could this be a limitation of typescript 3.6.4?
Exclude is used to remove keys from an interface. However, enums function differently.
An enum can be likened to a union of instances of that enum type. For example,
type MyEnum = MyEnum.All | MyEnum.OTHERTherefore, the goal is not to exclude keys, but rather to exclude types from a union type:
enum MyEnum {
ALL, OTHER, SOME, MORE
}
interface Props {
sources: Exclude<MyEnum, MyEnum.ALL | MyEnum.SOME>
}
const test: Props = { sources: MyEnum.ALL } // now triggers an error
It appears that what you need is the Exclude utility type:
sources: Exclude<MyEnum, MyEnum.ALL>
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