Type Alias EqualsAny<T>

EqualsAny: T extends readonly [infer A, infer B, ...(infer Rest)]
? If<Equals<A, B>, true, EqualsAny<[B, ...Rest]>>
: false

Test whether any adjacent types in a tuple are strictly equal.

Type Parameters

T extends readonly any[]
Tuple of types to compare

Remarks

Evaluates to true if at least one pair of neighboring types in the tuple is strictly equal.

Tuples with fewer than two elements always evaluate to false.

Example

type A = EqualsAny< [ string, number, string ] >;  // false
type B = EqualsAny< [ string, string, number ] >;  // true
type C = EqualsAny< [ 1, 2, 3 ] >;                 // false