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Cause this has nothing todo with the variables passed. Dont use it here. Simply do:
function bar({a = 0} = {}){ console.log(a) } bar({});//0 bar();//0 bar({a:10});//10
function bar({a = 0}){ console.log(a) } bar({});//0 bar({a:10});//10
function bar({a = 0} = {}){ console.log(a) } bar({});//0 bar({a:10});//10
function bar({a = 0} = {}){ console.log(a) } bar();//0 bar({a:10});//10
function bar({a = 0}){ console.log(a) } bar();//0 bar({a:10});//10