Description
Bug Report
🔎 Search Terms
infer function unknown
🕗 Version & Regression Information
- This is a crash
- This changed between versions ______ and _______
- This is the behavior in every version I tried, and I reviewed the FAQ for entries about _________
- I was unable to test this on prior versions because _______
Checked #48538, not sure if related.
Tested with nightly build v4.7.0-dev.20220415, which should have fixed #48538, still not bugged.
⏯ Playground Link
[Playground link with relevant code
](https://www.typescriptlang.org/play?ts=4.7.0-dev.20220415#code/JYOwLgpgTgZghgYwgAgApQPYAcDOAeAETjDgBpkAlCEAE2gD5kBvAKGWRuLgC5kiSA3G2QQAHmCiIwvABScSvfnACUyALyMqtaEPZRqdKAElIAW1nAzvLYdUbkIAK4AbZ0IC+LFjEcgEYYAwQZEgcMEIuckoDBmQZAH0sTFxedGx8JXIbBlVWPQgwRyhgp1cPL1CwGTyOLl4AbQBGUgAmUgBmUgAWAF1SYX1tYytkYHVGJmQAeinkABUAC2AcUZXfAGsQDAB3EGF8wuKHFzdhd372MQkpWX0cO0Y7+oAGPpZ3ZSEvGeQAWn--sgAEYQZw7VbIbYYKDrUAAcz+AIBXlAkFgiBQaVwLQiJCyMSgE2EV0k-lk8h4fC4D2iQ10yEGhhMEHMcUsLOsBJppVOnm8vn8gWClRxmXY2UJcUSyRwqRlositMM9FyAwKRRKJ3KLBF1TVQ2ZrLG9kmP0WywhTlMIKg+wZ6qOPPp52J4lJ0jiNOa70+XiAA)](https://www.typescriptlang.org/play?ts=4.7.0-dev.20220415&ssl=37&ssc=1&pln=1&pc=1#code/JYOwLgpgTgZghgYwgAgApQPYAcDOAeAETjDgBpkAlCEAE2gD5kBvAKGWRuLgC5kiSA3G2QQAHmCiIwvABScSvfnACUyALyMqtaEPZRqdKAElIAW1nAzvLYdUbkIAK4AbZ0IC+LFjEcgEYYAwQZBgQQi5ySgMGZBkAfSxMXF50bHwlchsGVVY9CDBHKGCnVw8vUJlcji5eAG0ARlIAJlIAZlIAFgBdUmF9bWMrZGB1RiZkAHoJ5AAVAAtgHGGl3wBrEAwAdxBhPIKihxc3YXde9jEJKVl9HDtGG9qABh6Wd2UhLynkAFpf3+QAEYQZxbZbITYYKCrUAAcx+fz+XlAkFgiBQqVwTXCJEy0SgY2EF0k-lk8h4fC4dyiA10yH6hhMEHMsUsTOseKpJWOnm8vn8gWCoSxGXYWXxsQSSRwKSlwoi1MM9ByfXyhWKRzK3hATUqKoGjOZI3s4y+80WYKcpiBUF2dNVBy5tNOhPExOksSpjVe7y8QA)
💻 Code
interface Props<Data, Render> {
data: Data;
extract: (data: Data) => Render;
renderItem: (item: Render) => null;
}
function fn<Data, Render> (_props: Props<Data, Render>) {
return null;
}
fn({
data: [1,2,3,4],
renderItem: i => { // This is unknown
return null;
},
extract: (res) => res[0],
});
// ----- below is working -------
interface Props2<Data, Render> {
extract: (data: Data) => Render;
renderItem: (item: Render) => null;
}
function fn2<Data, Render> (_props: Props2<Data, Render>) {
return null;
}
fn2({
renderItem: i => { // This is number
return null;
},
extract: () => 1,
});🙁 Actual behavior
in function fn1, parameter -> renderItem(i), " i " is inferred as unknown
🙂 Expected behavior
in function fn1, parameter -> renderItem(i), " i " should be inferred as number, as in fn2