Typescript says types a and b have no overlap What does it mean

0 votes
const value = Math.random() < 0.5 ? "a" : "b";
if (value !== "a") {
  // ...
} else if (value === "b") {
This condition will always return 'false' since the types '"a"' and '"b"' have no overlap.

  // Oops, unreachable
}

Found this code in a tutorial. I want to understand the meaning of this error: "types '"a"' and '"b"' have no overlap."

What are they talking about?

Jul 5, 2022 in TypeSript by Logan
• 2,140 points
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