Bug Report

🔎 Search Terms

method conditional return type not assignable to type

🕗 Version & Regression Information

3.3.3+

⏯ Playground Link

Playground link with relevant code

💻 Code

export interface Foo<T> {}
export class Foo<T> {
  public bar(): T extends string ? string | number : number {
    return 1;
  }
}

🙁 Actual behavior

Return statement is an error, despite being valid for both branches of the conditional return type.

This ONLY happens if the interface Foo exists. If the interface is commented out, the error goes away.

🙂 Expected behavior

Return statement is not an error, because 1 is assignable to both string | number and number.