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TypeScript - Extract Keys Of Specified Type
Helper type to extracts the keys of an object matching a defined type
type ValuesOf<T> = T[keyof T]
/**
* Get all the keys where the values are `TCondition` (string/number...)
*/
type ExtractKeysWhereValuesAreOfType<T, TCondition> = ValuesOf<{
[K in keyof T]: T[K] extends TCondition ? K : never
}>
example :
type ExtractStringKeys<T> = ExtractKeysWhereValuesAreOfType<T, string>
type Obj = {
id: string
name: string
age: 1
}
// type Example = "id" | "name"
type Example = ExtractStringKeys<Obj>