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The only reason to use typeof foo === "undefined" is when foo is a global identifier that might not have been declared at all, so it might raise a ReferenceError if evaluated. For a variable declared with const or let or import, a function argument, or a complex expression, simply foo === undefined is equivalent. Some of these conditions have become impossible and can be removed entirely, and some can be replaced more idiomatically with default parameters (note that JavaScript does not share the Python misfeature of evaluating the default parameter at function declaration time). Signed-off-by: Anders Kaseorg <anders@zulip.com> |
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