* Returns list of gatherer names for external querying. * @return {Array<string>}

* Each layout shift event has a 'score' which is the amount added to the CLS as a result of the given shift(s). * We calculate the score per el

* This function is kept for testing with `stub`.

* Returns all LayoutShift events that had no recent input. * Only a `weightedScore` per event is returned. For non-main-frame events, this is

* @param {LH.Gatherer.Context} context * @return {Promise<LH.Artifacts['LinkElements']>}

* @param {LH.Gatherer.Context} context * @param {LH.Artifacts['DevtoolsLog']} devtoolsLog * @return {Promise<LH.Artifacts['LinkElements'

* Provides durations in ms of all main thread top-level events * @param {Array<ToplevelEvent>} topLevelEvents * @param {number} startTim

* @param {Array<LH.Crdp.Audits.MixedContentIssueDetails>} mixedContentIssues * @return {LH.Audit.Details.TableItem}

@return {Promise<{requestedUrl?: string, mainDocumentUrl?: string}>}

* @param {string} url * @return {?string}

* Gets the tld of a domain * This function is used only while rendering pre-10.0 LHRs. * * @param {string} hostname * @ret

* @param {LH.Artifacts} artifacts * @param {LH.Audit.Context} context * @return {Promise<string[]>}

* @param {LH.Artifacts} artifacts * @param {LH.Audit.Context} context * @return {Promise<{cspHeaders: string[], xfoHeaders: string[]}>}

* @param {LH.Artifacts} artifacts * @param {LH.Audit.Context} context * @return {Promise<string[]>}

* Computes the set of URLs that *appeared* to be render-blocking based on our filter, * *but definitely were not* render-blocking based on the

* Convert the requestId to backend-version by removing the `:redirect` portion * * @param {string} requestId * @return {string}

* Returns the coefficients, scaled by the throttling settings if needed by the metric. * Some lantern metrics (speed-index) use components in t