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TypeScript 4.4: Control Flow Analysis

Posted on by Nithin Mohan TK 1 min read

TS 4.4 is smarter. It can now analyze aliased conditions.

function foo(arg: string | unknown) {
  const isString = typeof arg === "string";
  if (isString) {
      console.log(arg.toUpperCase()); // Works in 4.4!
  }
}

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