The callback function to remove. If not provided, removes all listeners for this event name
#### **Returns**
`Promise`
#### **Usage**
```javascript
// Define callback as a named function
const handleClick = (value) => {
console.log("Clicked:", value);
};
// Add listener
await api.addEventListener("product_clicked", handleClick);
// Remove specific listener
await api.removeEventListener("product_clicked", handleClick);
// Or remove ALL listeners for this event
await api.removeEventListener("product_clicked");
```
#### **Notes**
* To remove a specific listener, pass the exact same function reference used in `addEventListener()`
* Anonymous functions cannot be removed individually — store the function in a variable first
* Call without callback to remove all listeners for the given event name
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