Uncaught ReferenceError: Cannot access ‘obj‘ before initialization

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<!DOCTYPE html>
<html>
    <head>
        <title>document.write() Example</title>
    </head>
    <body>
        <script type="text/javascript">
        let activeEffect
        function effect(fn) {
            activeEffect = fn
            fn()
        }
        effect(
            () => {
                document.body.innerText = obj.text
            }
        )
        const obj = new Proxy(data, {
            get(target, key) {
                if (activeEffect) {
                    bucket.add(activeEffect)
                }
                return target[key]
            },
            set(target, key, newVal) {
                target[key] = newVal
                bucket.forEach(fn => fn())
                return true
            }
        })
        effect(
            () => {
                console.log('effect run')
                document.body.innerText = obj.text
            }
        )
        setTimeout(() => {
            obj.notExist = 'hello vue3'
        }, 1000);
             </script> 
    </body>

</html>