typescript 5.1 no longer issue error if your function returned type is not void or any
Typescript v 4.9.5 would throws an error if you have your code written like this
function f4(): undefined {
// no returns
}
In version 5.1 (not 5.0) writing code above is fine.
That's easy to understand. The code below would work for typescript 5.1 but not anything lower.
// this works for 5.1 but not for anything lower
function takesFunction(f: () => undefined): undefined
{
}
takesFunction(() => {
// no returns
});
takesFunction((): undefined => {
// no returns
});
takesFunction(() => {
return;
});
takesFunction(() => {
return undefined;
});
takesFunction((): undefined => {
return;
});
// ✅ Works in TypeScript 5.1!
function f4(): undefined {
// no returns
}
// ✅ Works in TypeScript 5.1!
takesFunction((): undefined => {
// no returns
});
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