How I usually do things is this:
enum tmp {
a,
b
}
const doStuff = (val: tmp) => {
console.log(val);
}
doStuff(tmp.b); // logs 1
But a library I use is doing smth like this:
interface tmpMap {
a: 0;
b: 1;
}
const tmp: tmpMap;
So I tried doing this:
const doStuff = (val: tmpMap) => {
console.log(val);
}
doStuff(tmp.b);
But this throws a bunch of errors, and just doesn't work.
Variable 'tmp' is used before being assigned.
Argument of type 'number' is not assignable to parameter of type 'tmpMap'.
Here's a link to playground.
Is there a way to use this setup the same way as the enum setup?
interface tmpMap {
a: 0;
b: 1;
}
// You'll have to actually assign the constant
declare const tmp: tmpMap;
const doStuff = (val: tmpMap[keyof tmpMap]) => {
console.log(val);
}
doStuff(tmp.b);