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In the spec, this happens in the EvaluateCall abstract operation (https://tc39.es/ecma262/#sec-evaluatecall), and the order is defined as: 3. Let argList be ? ArgumentListEvaluation of arguments. 4. If Type(func) is not Object, throw a TypeError exception. 5. If IsCallable(func) is false, throw a TypeError exception. In LibJS this is handled by CallExpression::execute(), which had the callee function check first and would therefore never evaluate the arguments for a non-function callee.