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// @strict: true
// @noEmit: true
// repro #48524
type Magic<X> = X extends [[infer Y, ...infer _], ...infer __] ? Y : never;
type R = Magic<[[number]]>
// repro #52722
type Recursive<Id> = {
id: Id
children: readonly Recursive<Id>[]
}
declare function getIds<Id>(items: readonly Recursive<Id>[]): Id[];
const items = [{
id: 'a',
children: [{
id: 'b',
children: []
}]
}] as const satisfies readonly Recursive<string>[]
const foo = getIds(items)
// variant with a fresh argument
const foo2 = getIds([{
id: 'a',
children: [{
id: 'b',
children: []
}]
}] as const)
// Repro from comment in #49226
type T1<T> = [number, T1<{ x: T }>];
type T2<T> = [42, T2<{ x: T }>];
function qq<U>(x: T1<U>, y: T2<U>) {
x = y;
y = x; // Error
}
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