import { _INTERNAL_getTracingHeadersForFetchRequest } from '@sentry/core';

function instrumentFetcher(fetchFn) {
  return function(input, init) {
    const headers = _INTERNAL_getTracingHeadersForFetchRequest(input, { headers: init?.headers });
    if (input instanceof Request && init === void 0) {
      if (!headers) {
        return fetchFn(input);
      }
      const requestWithTracing = new Request(input, { headers });
      return fetchFn(requestWithTracing);
    }
    const mergedInit = {
      ...init,
      ...headers ? { headers } : {}
    };
    return fetchFn(input, mergedInit);
  };
}

export { instrumentFetcher };
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