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

import { getHeadersObj } from '@graphql-mesh/utils';
import { handleMaybePromise } from '@whatwg-node/promise-helpers';
export function useOperationHeaders(factoryFn) {
    return {
        onFetch({ url, options, context, setOptions }) {
            return handleMaybePromise(() => factoryFn({
                url,
                options,
                context,
            }), newHeaders => setOptions({
                ...options,
                headers: {
                    ...getHeadersObj(options.headers || {}),
                    ...newHeaders,
                },
            }));
        },
    };
}