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tlaitinen/mapping-string-types.ts

Created November 9, 2017 09:36
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mapping-string-types.ts
type Map<A extends "A" | "B"> = {
"A": "A!",
"B": "B!"
}[A];
type AA = Map<"A">;
type BB = Map<"B">;
let a:AA = "A!";
let b:BB = "B!";
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