JavaScript convert error event to error object

reify_error_event.js

// Step 1. construct object
let obj = await new Promise((resolve, reject) => {
	const obj_pending = API_CONSTRUCTOR();

	obj_pending.addEventListener(
		'error',
		(event) => void reject(new Error(
			`${event.target.__proto__.constructor.name}: ${event.type} event`,
			{cause: event}
		)),
		{once: true}
	);

	obj_pending.addEventListener(
		API_OK_EVENT,
		(event) => void resolve(
			// NOTE: some APIs require you to return event.target directly
			event.target.result
		),
		{once: true}
	);

});

// Step 2. use object
DO_STUFF_WITH(obj);