* @return {Error}

* @param {string|undefined} userAgent * @param {LH.Artifacts.NetworkRequest} mainResource * @param {LH.Artifacts.MetaElement[]} metaElem

* Parse all .ts files in src/third_party/ and extract the bare package names * from import/export statements. Relative imports and node_modules paths

* @license * Copyright 2021 Google LLC * SPDX-License-Identifier: Apache-2.0

* @param {LH.Gatherer.ProtocolSession} session * @return {Promise<LH.Trace>}

* Given the RTT to each origin, estimates the observed server response times.

* Estimates the server response time of each origin. RTT times can be passed in or will be * estimated automatically if not provided.

* Computes the average throughput for the given requests in bits/second. * Excludes data URI, failed or otherwise incomplete, and cached reques

* Estimates the number of milliseconds remaining given current conditions before the node is complete.

* Evaluate an expression in the context of the current page. If useIsolation is true, the expression * will be evaluated in a content script th

* Some nodes do not refer to JS samples but to V8 system tasks, AKA * "meta" nodes. This function extracts those nodes from the profile.

* @param {LH.Gatherer.Driver} driver * @param {LH.Artifacts.ImageElement} element

* @param {LH.Gatherer.Driver} driver * @param {string} sourceMapUrl * @return {Promise<LH.Artifacts.RawSourceMap>}

* Images might be sized via CSS. In order to compute unsized-images failures, we need to collect * matched CSS rules to see if this is the case

* @template {{description: string | undefined}} T * @param {Array<T>} items * @param {AuditOptions} options * @return {Array<T>}

* Returns only lines that are near a message, or the first few lines if there are * no line messages. * @param {SnippetValue['lines']} l