Generic Tuple Optional Parameter spread errors with Type instantiation is excessively deep and possibly infinite. ts(2589)

Bug Report

type StringableParameters<TArgs> 
  = TArgs extends [optionalHead?:(infer OptionalArg), ...optionalRest:infer OptionalRest] //optionalHead? <- this question mark is what's causing error
    ? [(OptionalArg|string)?, ...StringableParameters<OptionalRest>] //ts(2589)
    : []

type Test = StringableParameters<[1,2?,3?]>
// type Test = [(string | 1)?, (string | 2)?, (string | 3)?, unknown?, unknown?, unknown?, unknown?, unknown?, unknown?, unknown?, unknown?, unknown?, unknown?, unknown?, unknown?, unknown?, unknown?, unknown?, unknown?, unknown?, unknown?, unknown?, unknown?, unknown?, unknown?, unknown?, unknown?, unknown?, unknown?, unknown?, unknown?, unknown?, unknown?, unknown?, unknown?, unknown?, unknown?, unknown?, unknown?, unknown?, unknown?, unknown?, unknown?, unknown?, unknown?, unknown?, unknown?, unknown?, unknown?, unknown?, unknown?, unknown?, unknown?, any?, ...any[]]

That question mark TArgs extends [optionalHead?:(infer OptionalArg) allowing parameters to be optional is leading to the infinite nesting with ts2589 error. If I remove that question mark - it compiles, but omit the optional parameters of the tuple

type StringableParameters<TArgs> = TArgs extends [optionalHead:(infer OptionalArg), ...optionalRest:infer OptionalRest]
? [(OptionalArg|string), ...StringableParameters<OptionalRest>]
: []
type Test = StringableParameters<[1, 2?, 3?]>

//type Test = [string | 1] - optional parameters omitted

🔎 Search Terms

Type instantiation is excessively deep and possibly infinite. ts(2589)
Generic Tuple extends Optional argument

🕗 Version & Regression Information

Typescript v5, v4.7.4,...

⏯ Playground Link

Playground link with relevant code

💻 Code

type StringableParameters<TArgs> 
  = TArgs extends [optionalHead?:(infer OptionalArg), ...optionalRest:infer OptionalRest] //optionalHead? <- this question mark is what's causing error
    ? [(OptionalArg|string)?, ...StringableParameters<OptionalRest>] //ts(2589)
    : []

type TestOptional = StringableParameters<[1,2?,3?]>
/* type TestOptional = [(string | 1 | undefined)?, (string | 2 | undefined)?, (string | 3 | undefined)?, unknown?, unknown?, unknown?, unknown?, unknown?, unknown?, 
unknown?, unknown?, unknown?, unknown?, unknown?, unknown?, unknown?, unknown?, unknown?, unknown?, unknown?, unknown?, unknown?, unknown?, unknown?, unknown?,
 unknown?, unknown?, unknown?, unknown?, unknown?, unknown?, unknown?, unknown?, unknown?, unknown?, unknown?, unknown?, unknown?, unknown?, unknown?, unknown?,
 unknown?, unknown?, unknown?, unknown?, unknown?, unknown?, unknown?, ... 6 more ...?, any?]
*/

type StringableParametersNoOptional<TArgs> 
  = TArgs extends [optionalHead:(infer OptionalArg), ...optionalRest:infer OptionalRest] //optionalHead? <- this question mark is what's causing error
    ? [(OptionalArg|string), ...StringableParametersNoOptional<OptionalRest>] //ts(2589)
    : []

type TestNoOptional = StringableParametersNoOptional<[1,2?,3?]>
//type TestNoOptional = [string | 1]

🙁 Actual behavior

Type instantiation is excessively deep and possibly infinite.(2589) and if I use ts-ignore, the TestOptional type has excessive amount of unknown optional parameters on the tail

🙂 Expected behavior

type TestOptional = [(string | 1 | undefined)?, (string | 2 | undefined)?, (string | 3 | undefined)?]

Inizia dalla riproduzione collegata in TypeScript Playground e confronta i tipi condizionali di tupla opzionali e non opzionali mostrati nell’issue. Indaga sul motivo per cui lo spread opzionale ricorsivamente porta a un numero eccessivo di parametri unknown; il lavoro è completato quando viene prodotta la tupla opzionale attesa di tre elementi senza ts(2589).