/**
         * Operation for caching the response from the server. This has to happen all
         * at once, so that the cache and LRU tracking remain in sync. If the network request
         * completes before the timeout, this logic will be run inline with the response flow.
         * If the request times out on the server, an error will be returned but the real network
         * request will still be running in the background, to be cached when it completes.
         */
        cacheResponse(req, res, lru, okToCacheOpaque = false) {
            return __awaiter$1(this, void 0, void 0, function* () {
                // Only cache successful responses.
                if (!res.ok || (okToCacheOpaque && res.type === 'opaque')) {
                    return;
                }
                // If caching this response would make the cache exceed its maximum size, evict something
                // first.
                if (lru.size >= this.config.maxSize) {
                    // The cache is too big, evict something.
                    const evictedUrl = lru.pop();
                    if (evictedUrl !== null) {
                        yield this.clearCacheForUrl(evictedUrl);
                    }
                }
                // TODO: evaluate for possible race conditions during flaky network periods.
                // Mark this resource as having been accessed recently. This ensures it won't be evicted
                // until enough other resources are requested that it falls off the end of the LRU chain.
                lru.accessed(req.url);
                // Store the response in the cache (cloning because the browser will consume
                // the body during the caching operation).
                yield (yield this.cache).put(req, res.clone());
                // Store the age of the cache.
                const ageTable = yield this.ageTable;
                yield ageTable.write(req.url, { age: this.adapter.time });
                // Sync the LRU chain to non-volatile storage.
                yield this.syncLru();
            });
        }