datahub/wherehows-web/app/typings/generic.d.ts

/**
 * Create a generic String-Union key -> value mapping constraint
 * where the string union must be keys on the map and values
 */
type StringUnionKeyToValue<U extends string> = { [K in U]: K };

/**
 * Generic String Enum enforcing the keys on an object are found in
 * enum and value is of type V
 */
type StringEnumKeyToEnumValue<T extends string, V> = { [K in T]: V };

export { StringUnionKeyToValue, StringEnumKeyToEnumValue };