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    Use a tuple: [number, number[]] Commented Feb 24, 2022 at 11:10
  • It has to be an array? Why not an object (e.g. { id : number; data : number[] })? Commented Feb 24, 2022 at 11:15
  • The array was given. Now I found out that's acutally a tuple type. I was able to sove it now. Thank you very much! Commented Feb 24, 2022 at 19:45