types-kit.mergetuple.md

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MergeTuple type

Merge two tuples, values of the second array will override values of the array type.

Signature:

export type MergeTuple<
  A extends readonly unknown[],
  B extends readonly unknown[],
> = If<
  IsReadonlyArray<B>,
  readonly [...B, ...Slice<A, B['length']>],
  [...B, ...Slice<A, B['length']>]
>

References: If, IsReadonlyArray, Slice

Example

type Foo = [1, 2, 3]
 type Bar = [4, 5]
 // Expect: [4, 5, 3]
 type MergedTuple = MergeTuple<Foo, Bar>