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// Asynchronous function that waits for the given number of messages to be
// received by `window`, then returns those messages.
function waitForMessages(numMessages) {
return new Promise((resolve) => {
const messages = [];
window.addEventListener("message", function handler(evt) {
messages.push(evt.data);
if (messages.length == numMessages) {
window.removeEventListener("message", handler);
resolve(messages);
}
});
});
}