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tests/cases/compiler/exhaustiveSwitchCheckCircularity.ts(14,26): error TS2345: Argument of type 'string' is not assignable to parameter of type 'never'.
==== tests/cases/compiler/exhaustiveSwitchCheckCircularity.ts (1 errors) ====
// Repro from #47539
declare function isNever(n: never): boolean;
function f() {
let foo: "aaa" | "bbb" = "aaa";
while (true) {
switch (foo) {
case "aaa":
}
if (foo === "aaa") {
foo = "bbb";
}
else if (isNever(foo)) { // Error expected
~~~
!!! error TS2345: Argument of type 'string' is not assignable to parameter of type 'never'.
break;
}
}
}
// Repro from #51688
declare function functionB(key: string): string;
function functionC(): void {
let unionVal: "A" | "B" = "A";
while (true) {
let key: string;
switch (unionVal) {
case "A": {
key = "AA";
break;
}
}
functionB(key);
}
}
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