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//// [deepComparisons.ts]
function f1<T, K1 extends keyof T, K2 extends keyof T[K1]>() {
let v1: Extract<T, string> = 0 as any as T; // Error
let v2: Extract<T[K1], string> = 0 as any as T[K1]; // Error
let v3: Extract<T[K1][K2], string> = 0 as any as T[K1][K2]; // No error
}
type Foo<T> = { x: Foo<T> };
type Bar<T> = { x: Bar<T[]> };
function f2<U>() {
let x: Foo<U> = 0 as any as Bar<U>; // Error, excessive stack depth
}
type Foo1<T> = { x: Foo2<T> };
type Foo2<T> = { x: Foo1<T> };
function f3<U>() {
let x: Foo1<U> = 0 as any as Bar<U>; // No error!
}
// Repro from #46500
type F<T> = {} & (
T extends [any, ...any[]]
? { [K in keyof T]?: F<T[K]> }
: T extends any[]
? F<T[number]>[]
: T extends { [K: string]: any }
? { [K in keyof T]?: F<T[K]> }
: { x: string }
);
declare function f<T = any>(): F<T>;
function g() {
return f() as F<any>;
}
//// [deepComparisons.js]
function f1() {
var v1 = 0; // Error
var v2 = 0; // Error
var v3 = 0; // No error
}
function f2() {
var x = 0; // Error, excessive stack depth
}
function f3() {
var x = 0; // No error!
}
function g() {
return f();
}
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