CompositionTypeSatisfiesEnum

Type Aliases

CompositionTypeSatisfiesEnum

CompositionTypeSatisfiesEnum<T, Enum> = unknown

Defined in: packages/isaacscript-common/src/types/CompositionTypeSatisfiesEnum.ts:31

Helper type to validate that a union of interfaces with a field of type that is based on an enum is complete.

For example:

enum ObjectiveType {
  FOO,
  BAR,
  BAZ,
}

interface FooObjective {
  type: ObjectiveType.FOO;
  fooThing: number;
}

interface BarObjective {
  type: ObjectiveType.BAR;
  barThing: string;
}

type Objective = FooObjective | BarObjective;
type _Test = CompositionTypeSatisfiesEnum<Objective, ObjectiveType>;

In this example, Test would be flagged by TypeScript because Objective does not contain an entry for BazObjective.

Type Parameters

T

T extends object

Enum

Enum extends T["type"]