I have a requirement:
type AllowedKeys = 'a' | 'b' | 'c'
... and now I want to define a type where the key has to be one of the values in AllowedKeys. For example:
type MyType = {
a: number;
b: string;
c: boolean;
d: {} // <--- I want to restrict this because `d` is not in AllowedKeys
}
How can this be implemented?
One way to develop a customized type validator is by utilizing the syntax
T extends (Condition ? unknown : never)type ValidateProperties<
P,
T extends ([keyof T] extends [P] ? [P] extends [keyof T] ? unknown : never : never)
> = T
type PotentialProperties = 'x' | 'y' | 'z'
type CustomType = ValidateProperties<PotentialProperties, {
x: number;
y: string;
z: boolean;
}>
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