[英]TypeScript: Reverse map key-value type to value-key
给定一个类型的对象:
type Key2Value = {
foo: "bar"
voo: "doo"
}
假设该类型的值始终是字符串类型,那么如何构造一个实用程序类型ReverseMap<T>
将键值对反向映射到值键对?
type Value2Key = ReverseMap<Key2Value>
// yields:
type Value2Key = {
bar: "foo"
doo: "voo"
}
type Key2Value = {
foo: "bar"
voo: "doo"
}
type ReverseMap<T extends Record<keyof T, keyof any>> = {
[P in T[keyof T]]: {
[K in keyof T]: T[K] extends P ? K : never
}[keyof T]
}
type Value2Key = ReverseMap<Key2Value>
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