remix-utils/build/server/is-prefetch.js

This package contains simple utility functions to use with [React Router](https://reactrouter.com/).

import { getHeaders } from "./get-headers.js";
export function isPrefetch(requestOrHeaders) {
    let headers = getHeaders(requestOrHeaders);
    if (!headers) {
        return false;
    }
    let purpose = headers.get("Purpose") ||
        headers.get("X-Purpose") ||
        headers.get("Sec-Purpose") ||
        headers.get("Sec-Fetch-Purpose") ||
        headers.get("Moz-Purpose") ||
        headers.get("X-Moz");
    return purpose?.toLowerCase() === "prefetch";
}
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