Repository navigation
The type of private fields in a class cannot be used in generic #30882
Description
TypeScript Version: 3.4.1
Search Terms:
generic, class, private field
Code
class Foo<T> {
private a!: T; // when it is public, no error occurs below
}
type Bar<T extends Record<string, Foo<any>>> = T[keyof T]["a"]; // ts(2536) occurs, while autocomplete works well.
type A = Foo<number>["a"]; // it works always!Expected behavior:
Not treating it as an error. If it is inteneded, at least the error message should be more helpful.
Actual behavior:
ts(2536) occurs.
Playground Link
Related Issues:
Activity
RyanCavanaugh commentedon Apr 12, 2019
Nathan Shively-Sanders (@sandersn) not 100% convinced it's a bug per se, but it well might be. The error is indeed weird
andrewbranch commentedon Jun 24, 2019
This isn’t a bug, but I improved the error message to make it clear that it’s on purpose: