@graphql-mesh/plugin-operation-headers/esm/index.js

import { getHeadersObj, mapMaybePromise } from '@graphql-mesh/utils';
export function useOperationHeaders(factoryFn) {
    return {
        onFetch({ url, options, context, setOptions }) {
            const existingHeaders = getHeadersObj(options.headers || {});
            const newHeaders$ = factoryFn({
                url,
                options,
                context,
            });
            return mapMaybePromise(newHeaders$, newHeaders => {
                setOptions({
                    ...options,
                    headers: {
                        ...existingHeaders,
                        ...newHeaders,
                    },
                });
            });
        },
    };
}