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License: MIT License
TS Zen
License: MIT License
This seems less buggy:
export type NormalizedPathKey = string | symbol
export type NonemptyTuple<X extends unknown = unknown, HasIdx extends number = 0> = (
X[] & { [k in HasIdx | 0]: X}
) | (
readonly X[] & { readonly [k in HasIdx | 0]: X }
)
export type NonemptyPathTuple = NonemptyTuple<NormalizedPathKey>
type Rest<T extends readonly any[]> =
T extends readonly [any, ...(infer U)] ? U : T;
export type _Set<
Object,
Path extends NonemptyPathTuple,
Value = unknown
> = Path[0] extends keyof Object
? (
{
[key in (keyof Object | Path[0])]: Path[0] extends key
? (
Rest<Path> extends NonemptyPathTuple
? _Set<Object[Path[0]], Rest<Path>, Value>
: Value
)
: Object[key]
}
) : (
{
[key in (keyof Object | Path[0])]: key extends keyof Object
? Object[key] : (
Rest<Path> extends NonemptyPathTuple
? _Set<{}, Rest<Path>, Value>
: Value
)
}
)
const nestedObject = {
a: {
b: {
c: {
d: 'Hello',
foo: 'bar'
} ,
bar: 'baz'
}
}
} as const
type NestedObject = typeof nestedObject
const pathABCD = [ 'a', 'b', 'c', 'd'] as const
type PathABCD = typeof pathABCD
const goodbye = 'Goodbye' as const
type Goodbye = typeof goodbye
type NestedObjectWithGoodbyeSet = _Set<NestedObject, PathABCD, Goodbye>
const x: NestedObjectWithGoodbyeSet = {
a: {
b: {
bar: "baz",
c: {
d: "Goodbye",
foo: "bar",
}
}
}
}
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