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That's because TS will generate initialisation code, but JS won't, so the author will have to manually write code to remove undefined from the type.\r\n\r\n```js\r\n/** @param {number} [a=101] */\r\nfunction f(a) {\r\n  // a: number | undefined here\r\n  if (!a) {\r\n    a = 101\r\n  }\r\n  // a: number here\r\n}\r\n```\r\n\r\nNote that we don't check that\r\n1. the initializer value is actually assigned to the parameter.\r\n2. the initializer's type matches the declared type of the parameter.\r\n\r\nPretty much we just parse it and leave it alone.\r\n\r\nFixes 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