core: import lantern from trace engine

.eslintignore

@@ -19,5 +19,3 @@ third-party/**
 **/*.d.cts
 
 page-functions-test-case*out*.js
-# TODO(15841): remove when importing Lantern from npm
-core/lib/lantern/**/*.test.js

core/audits/byte-efficiency/byte-efficiency-audit.js

@@ -14,9 +14,6 @@ import {LCPImageRecord} from '../../computed/lcp-image-record.js';
 
 const str_ = i18n.createIcuMessageFn(import.meta.url, {});
 
-/** @typedef {import('../../lib/lantern/simulation/Simulator.js').Simulator} Simulator */
-/** @typedef {import('../../lib/lantern/BaseNode.js').Node<LH.Artifacts.NetworkRequest>} Node */
-
 // Parameters for log-normal distribution scoring. These values were determined by fitting the
 // log-normal cumulative distribution function curve to the former method of linear interpolation
 // scoring between the control points {average = 300 ms, poor = 750 ms, zero = 5000 ms} using the
@@ -96,8 +93,8 @@ class ByteEfficiencyAudit extends Audit {
    * Computes the estimated effect of all the byte savings on the provided graph.
    *
    * @param {Array<LH.Audit.ByteEfficiencyItem>} results The array of byte savings results per resource
-   * @param {Node} graph
-   * @param {Simulator} simulator
+   * @param {LH.Gatherer.Simulation.GraphNode} graph
+   * @param {LH.Gatherer.Simulation.Simulator} simulator
    * @param {{label?: string, providedWastedBytesByUrl?: Map<string, number>}=} options
    * @return {{savings: number, simulationBeforeChanges: LH.Gatherer.Simulation.Result, simulationAfterChanges: LH.Gatherer.Simulation.Result}}
    */
@@ -151,7 +148,7 @@ class ByteEfficiencyAudit extends Audit {
 
   /**
    * @param {ByteEfficiencyProduct} result
-   * @param {Simulator} simulator
+   * @param {LH.Gatherer.Simulation.Simulator} simulator
    * @param {LH.Artifacts.MetricComputationDataInput} metricComputationInput
    * @param {LH.Audit.Context} context
    * @return {Promise<LH.Audit.Product>}

core/audits/byte-efficiency/render-blocking-resources.js

@@ -8,22 +8,16 @@
  * @fileoverview Audit a page to see if it does have resources that are blocking first paint
  */
 
-
 import {Audit} from '../audit.js';
 import * as i18n from '../../lib/i18n/i18n.js';
-import {BaseNode} from '../../lib/lantern/lantern.js';
+import * as Lantern from '../../lib/lantern/lantern.js';
 import {UnusedCSS} from '../../computed/unused-css.js';
 import {NetworkRequest} from '../../lib/network-request.js';
 import {LoadSimulator} from '../../computed/load-simulator.js';
 import {FirstContentfulPaint} from '../../computed/metrics/first-contentful-paint.js';
 import {LCPImageRecord} from '../../computed/lcp-image-record.js';
 import {NavigationInsights} from '../../computed/navigation-insights.js';
 
-
-/** @typedef {import('../../lib/lantern/simulation/Simulator.js').Simulator} Simulator */
-/** @typedef {import('../../lib/lantern/BaseNode.js').Node<LH.Artifacts.NetworkRequest>} Node */
-/** @typedef {import('../../lib/lantern/NetworkNode.js').NetworkNode<LH.Artifacts.NetworkRequest>} NetworkNode */
-
 // Because of the way we detect blocking stylesheets, asynchronously loaded
 // CSS with link[rel=preload] and an onload handler (see https://github.com/filamentgroup/loadCSS)
 // can be falsely flagged as blocking. Therefore, ignore stylesheets that loaded fast enough
@@ -44,10 +38,10 @@ const str_ = i18n.createIcuMessageFn(import.meta.url, UIStrings);
 /**
  * Given a simulation's nodeTimings, return an object with the nodes/timing keyed by network URL
  * @param {LH.Gatherer.Simulation.Result['nodeTimings']} nodeTimings
- * @return {Map<string, {node: Node, nodeTiming: LH.Gatherer.Simulation.NodeTiming}>}
+ * @return {Map<string, {node: LH.Gatherer.Simulation.GraphNode, nodeTiming: LH.Gatherer.Simulation.NodeTiming}>}
  */
 function getNodesAndTimingByRequestId(nodeTimings) {
-  /** @type {Map<string, {node: Node, nodeTiming: LH.Gatherer.Simulation.NodeTiming}>} */
+  /** @type {Map<string, {node: LH.Gatherer.Simulation.GraphNode, nodeTiming: LH.Gatherer.Simulation.NodeTiming}>} */
   const requestIdToNode = new Map();
 
   for (const [node, nodeTiming] of nodeTimings) {
@@ -61,8 +55,8 @@ function getNodesAndTimingByRequestId(nodeTimings) {
 
 /**
  * Adjust the timing of a node and its dependencies to account for stack specific overrides.
- * @param {Map<Node, LH.Gatherer.Simulation.NodeTiming>} adjustedNodeTimings
- * @param {Node} node
+ * @param {Map<LH.Gatherer.Simulation.GraphNode, LH.Gatherer.Simulation.NodeTiming>} adjustedNodeTimings
+ * @param {LH.Gatherer.Simulation.GraphNode} node
  * @param {LH.Artifacts.DetectedStack[]} Stacks
  */
 function adjustNodeTimings(adjustedNodeTimings, node, Stacks) {
@@ -83,7 +77,7 @@ function adjustNodeTimings(adjustedNodeTimings, node, Stacks) {
  * Any stack specific timing overrides should go in this function.
  * @see https://github.com/GoogleChrome/lighthouse/issues/2832#issuecomment-591066081
  *
- * @param {Node} node
+ * @param {LH.Gatherer.Simulation.GraphNode} node
  * @param {LH.Gatherer.Simulation.NodeTiming} nodeTiming
  * @param {LH.Artifacts.DetectedStack[]} Stacks
  */
@@ -93,7 +87,7 @@ function computeStackSpecificTiming(node, nodeTiming, Stacks) {
     // AMP will load a linked stylesheet asynchronously if it has not been loaded after 2.1 seconds:
     // https://github.com/ampproject/amphtml/blob/8e03ac2f315774070651584a7e046ff24212c9b1/src/font-stylesheet-timeout.js#L54-L59
     // Any potential savings must only include time spent on AMP stylesheet nodes before 2.1 seconds.
-    if (node.type === BaseNode.TYPES.NETWORK &&
+    if (node.type === Lantern.Graph.BaseNode.types.NETWORK &&
         node.request.resourceType === NetworkRequest.TYPES.Stylesheet &&
         nodeTiming.endTime > 2100) {
       stackSpecificTiming.endTime = Math.max(nodeTiming.startTime, 2100);
@@ -208,8 +202,8 @@ class RenderBlockingResources extends Audit {
    * devs that they should be able to get to a reasonable first paint without JS, which is not a bad
    * thing.
    *
-   * @param {Simulator} simulator
-   * @param {Node} fcpGraph
+   * @param {LH.Gatherer.Simulation.Simulator} simulator
+   * @param {LH.Gatherer.Simulation.GraphNode} fcpGraph
    * @param {Set<string>} deferredIds
    * @param {Map<string, number>} wastedCssBytesByUrl
    * @param {LH.Artifacts.DetectedStack[]} Stacks
@@ -225,7 +219,7 @@ class RenderBlockingResources extends Audit {
 
       // If a node can be deferred, exclude it from the new FCP graph
       const canDeferRequest = deferredIds.has(node.id);
-      if (node.type !== BaseNode.TYPES.NETWORK) return !canDeferRequest;
+      if (node.type !== Lantern.Graph.BaseNode.types.NETWORK) return !canDeferRequest;
 
       const isStylesheet =
         node.request.resourceType === NetworkRequest.TYPES.Stylesheet;

core/audits/dobetterweb/uses-http2.js

@@ -9,9 +9,6 @@
  * origin are over the http/2 protocol.
  */
 
-/** @typedef {import('../../lib/lantern/simulation/Simulator.js').Simulator} Simulator */
-/** @typedef {import('../../lib/lantern/BaseNode.js').Node<LH.Artifacts.NetworkRequest>} Node */
-
 import {Audit} from '../audit.js';
 import {EntityClassification} from '../../computed/entity-classification.js';
 import UrlUtils from '../../lib/url-utils.js';
@@ -69,8 +66,8 @@ class UsesHTTP2Audit extends Audit {
    * Computes the estimated effect of all results being converted to http/2 on the provided graph.
    *
    * @param {Array<{url: string}>} results
-   * @param {Node} graph
-   * @param {Simulator} simulator
+   * @param {LH.Gatherer.Simulation.GraphNode} graph
+   * @param {LH.Gatherer.Simulation.Simulator} simulator
    * @param {{label?: string}=} options
    * @return {{savings: number, simulationBefore: LH.Gatherer.Simulation.Result, simulationAfter: LH.Gatherer.Simulation.Result}}
    */

core/audits/long-tasks.js

@@ -86,7 +86,7 @@ class LongTasks extends Audit {
    * most time will be attributed to 'other' (the category of the top-level
    * RunTask). See pruning in `PageDependencyGraph.linkCPUNodes`.
    * @param {LH.Artifacts.TaskNode} task
-   * @param {Map<Lantern.TraceEvent, LH.Gatherer.Simulation.NodeTiming>|undefined} taskTimingsByEvent
+   * @param {Map<Lantern.Types.TraceEvent, LH.Gatherer.Simulation.NodeTiming>|undefined} taskTimingsByEvent
    * @param {Map<TaskGroupIds, number>} [timeByTaskGroup]
    * @return {{startTime: number, duration: number, timeByTaskGroup: Map<TaskGroupIds, number>}}
    */
@@ -117,7 +117,7 @@ class LongTasks extends Audit {
   /**
    * @param {Array<LH.Artifacts.TaskNode>} longTasks
    * @param {Set<string>} jsUrls
-   * @param {Map<Lantern.TraceEvent, LH.Gatherer.Simulation.NodeTiming>|undefined} taskTimingsByEvent
+   * @param {Map<Lantern.Types.TraceEvent, LH.Gatherer.Simulation.NodeTiming>|undefined} taskTimingsByEvent
    * @return {LH.Audit.Details.DebugData}
    */
   static makeDebugData(longTasks, jsUrls, taskTimingsByEvent) {
@@ -155,7 +155,7 @@ class LongTasks extends Audit {
   /**
    * Get timing from task, overridden by taskTimingsByEvent if provided.
    * @param {LH.Artifacts.TaskNode} task
-   * @param {Map<Lantern.TraceEvent, LH.Gatherer.Simulation.NodeTiming>|undefined} taskTimingsByEvent
+   * @param {Map<Lantern.Types.TraceEvent, LH.Gatherer.Simulation.NodeTiming>|undefined} taskTimingsByEvent
    * @return {Timing}
    */
   static getTiming(task, taskTimingsByEvent) {
@@ -185,7 +185,7 @@ class LongTasks extends Audit {
     const metricComputationData = Audit.makeMetricComputationDataInput(artifacts, context);
     const tbtResult = await TotalBlockingTime.request(metricComputationData, context);
 
-    /** @type {Map<Lantern.TraceEvent, LH.Gatherer.Simulation.NodeTiming>|undefined} */
+    /** @type {Map<Lantern.Types.TraceEvent, LH.Gatherer.Simulation.NodeTiming>|undefined} */
     let taskTimingsByEvent;
 
     if (settings.throttlingMethod === 'simulate') {

core/audits/uses-rel-preload.js

@@ -4,6 +4,7 @@
  * SPDX-License-Identifier: Apache-2.0
  */
 
+import * as Lantern from '../lib/lantern/lantern.js';
 import UrlUtils from '../lib/url-utils.js';
 import {NetworkRequest} from '../lib/network-request.js';
 import {Audit} from './audit.js';
@@ -61,8 +62,8 @@ class UsesRelPreloadAudit extends Audit {
       if (node.type !== 'network') return;
       // Don't include the node itself or any CPU nodes in the initiatorPath
       const path = traversalPath.slice(1).filter(initiator => initiator.type === 'network');
-      if (!UsesRelPreloadAudit.shouldPreloadRequest(node.rawRequest, mainResource, path)) return;
-      urls.add(node.rawRequest.url);
+      if (!UsesRelPreloadAudit.shouldPreloadRequest(node.request, mainResource, path)) return;
+      urls.add(node.request.url);
     });
 
     return urls;
@@ -75,6 +76,7 @@ class UsesRelPreloadAudit extends Audit {
    * @return {Set<string>}
    */
   static getURLsFailedToPreload(graph) {
+    // TODO: add `fromPrefetchCache` to Lantern.Types.NetworkRequest, then use node.request here instead of rawRequest.
     /** @type {Array<LH.Artifacts.NetworkRequest>} */
     const requests = [];
     graph.traverse(node => node.type === 'network' && requests.push(node.rawRequest));
@@ -109,8 +111,8 @@ class UsesRelPreloadAudit extends Audit {
    * Critical requests deeper than depth 2 are more likely to be a case-by-case basis such that it
    * would be a little risky to recommend blindly.
    *
-   * @param {LH.Artifacts.NetworkRequest} request
-   * @param {LH.Artifacts.NetworkRequest} mainResource
+   * @param {Lantern.Types.NetworkRequest} request
+   * @param {Lantern.Types.NetworkRequest} mainResource
    * @param {Array<LH.Gatherer.Simulation.GraphNode>} initiatorPath
    * @return {boolean}
    */
@@ -157,7 +159,7 @@ class UsesRelPreloadAudit extends Audit {
 
       if (node.isMainDocument()) {
         mainDocumentNode = node;
-      } else if (node.rawRequest && urls.has(node.rawRequest.url)) {
+      } else if (node.request && urls.has(node.request.url)) {
         nodesToPreload.push(node);
       }
     });
@@ -189,7 +191,7 @@ class UsesRelPreloadAudit extends Audit {
 
       const wastedMs = Math.round(timingBefore.endTime - timingAfter.endTime);
       if (wastedMs < THRESHOLD_IN_MS) continue;
-      results.push({url: node.rawRequest.url, wastedMs});
+      results.push({url: node.request.url, wastedMs});
     }
 
     if (!results.length) {

core/computed/critical-request-chains.js

@@ -4,6 +4,7 @@
  * SPDX-License-Identifier: Apache-2.0
  */
 
+import * as Lantern from '../lib/lantern/lantern.js';
 import {makeComputedArtifact} from './computed-artifact.js';
 import {NetworkRequest} from '../lib/network-request.js';
 import {MainResource} from './main-resource.js';
@@ -14,8 +15,8 @@ class CriticalRequestChains {
    * For now, we use network priorities as a proxy for "render-blocking"/critical-ness.
    * It's imperfect, but there is not a higher-fidelity signal available yet.
    * @see https://docs.google.com/document/d/1bCDuq9H1ih9iNjgzyAL0gpwNFiEP4TZS-YLRp_RuMlc
-   * @param {LH.Artifacts.NetworkRequest} request
-   * @param {LH.Artifacts.NetworkRequest} mainResource
+   * @param {Lantern.Types.NetworkRequest} request
+   * @param {Lantern.Types.NetworkRequest} mainResource
    * @return {boolean}
    */
   static isCritical(request, mainResource) {
@@ -105,7 +106,7 @@ class CriticalRequestChains {
     graph.traverse((node, traversalPath) => {
       seenNodes.add(node);
       if (node.type !== 'network') return;
-      if (!CriticalRequestChains.isCritical(node.rawRequest, mainResource)) return;
+      if (!CriticalRequestChains.isCritical(node.request, mainResource)) return;
 
       const networkPath = traversalPath
         .filter(/** @return {n is LH.Gatherer.Simulation.GraphNetworkNode} */
@@ -117,7 +118,7 @@ class CriticalRequestChains {
       if (networkPath.some(r => !CriticalRequestChains.isCritical(r, mainResource))) return;
 
       // Ignore non-network things (like data urls).
-      if (NetworkRequest.isNonNetworkRequest(node.rawRequest)) return;
+      if (NetworkRequest.isNonNetworkRequest(node.request)) return;
 
       addChain(networkPath);
     }, getNextNodes);

core/computed/document-urls.js

@@ -42,7 +42,7 @@ class DocumentUrls {
     if (!requestedUrl || !mainDocumentUrl) throw new Error('No main frame navigations found');
 
     const initialRequest =
-      Lantern.Simulation.NetworkAnalyzer.findResourceForUrl(networkRecords, requestedUrl);
+      Lantern.Core.NetworkAnalyzer.findResourceForUrl(networkRecords, requestedUrl);
     if (initialRequest?.redirects?.length) requestedUrl = initialRequest.redirects[0].url;
 
     return {requestedUrl, mainDocumentUrl};

core/computed/load-simulator.js

@@ -12,7 +12,7 @@ class LoadSimulator {
   /**
    * @param {{devtoolsLog: LH.DevtoolsLog, settings: LH.Audit.Context['settings']}} data
    * @param {LH.Artifacts.ComputedContext} context
-   * @return {Promise<Lantern.Simulation.Simulator>}
+   * @return {Promise<LH.Gatherer.Simulation.Simulator>}
    */
   static async compute_(data, context) {
     const networkAnalysis = await NetworkAnalysis.request(data.devtoolsLog, context);

core/computed/main-resource.js

@@ -29,7 +29,7 @@ class MainResource {
     // would have evicted the first request by the time `MainDocumentRequest` (a consumer
     // of this computed artifact) attempts to fetch the contents, resulting in a protocol error.
     const mainResource =
-      Lantern.Simulation.NetworkAnalyzer.findLastDocumentForUrl(records, mainDocumentUrl);
+      Lantern.Core.NetworkAnalyzer.findLastDocumentForUrl(records, mainDocumentUrl);
     if (!mainResource) {
       throw new Error('Unable to identify the main resource');
     }

core/computed/metrics/lantern-first-contentful-paint.js

@@ -8,13 +8,11 @@ import * as Lantern from '../../lib/lantern/lantern.js';
 import {makeComputedArtifact} from '../computed-artifact.js';
 import {getComputationDataParams, lanternErrorAdapter} from './lantern-metric.js';
 
-/** @typedef {import('../../lib/lantern/Metric.js').Extras} Extras */
-
 class LanternFirstContentfulPaint extends Lantern.Metrics.FirstContentfulPaint {
   /**
    * @param {LH.Artifacts.MetricComputationDataInput} data
    * @param {LH.Artifacts.ComputedContext} context
-   * @param {Omit<Extras, 'optimistic'>=} extras
+   * @param {Omit<Lantern.Metrics.Extras, 'optimistic'>=} extras
    * @return {Promise<LH.Artifacts.LanternMetric>}
    */
   static async computeMetricWithGraphs(data, context, extras) {

core/computed/metrics/lantern-interactive.js

@@ -9,13 +9,11 @@ import {makeComputedArtifact} from '../computed-artifact.js';
 import {LanternLargestContentfulPaint} from './lantern-largest-contentful-paint.js';
 import {getComputationDataParams, lanternErrorAdapter} from './lantern-metric.js';
 
-/** @typedef {import('../../lib/lantern/Metric.js').Extras} Extras */
-
 class LanternInteractive extends Lantern.Metrics.Interactive {
   /**
    * @param {LH.Artifacts.MetricComputationDataInput} data
    * @param {LH.Artifacts.ComputedContext} context
-   * @param {Omit<Extras, 'optimistic'>=} extras
+   * @param {Omit<Lantern.Metrics.Extras, 'optimistic'>=} extras
    * @return {Promise<LH.Artifacts.LanternMetric>}
    */
   static async computeMetricWithGraphs(data, context, extras) {

core/computed/metrics/lantern-largest-contentful-paint.js

@@ -9,13 +9,11 @@ import {makeComputedArtifact} from '../computed-artifact.js';
 import {getComputationDataParams, lanternErrorAdapter} from './lantern-metric.js';
 import {LanternFirstContentfulPaint} from './lantern-first-contentful-paint.js';
 
-/** @typedef {import('../../lib/lantern/Metric.js').Extras} Extras */
-
 class LanternLargestContentfulPaint extends Lantern.Metrics.LargestContentfulPaint {
   /**
    * @param {LH.Artifacts.MetricComputationDataInput} data
    * @param {LH.Artifacts.ComputedContext} context
-   * @param {Omit<Extras, 'optimistic'>=} extras
+   * @param {Omit<Lantern.Metrics.Extras, 'optimistic'>=} extras
    * @return {Promise<LH.Artifacts.LanternMetric>}
    */
   static async computeMetricWithGraphs(data, context, extras) {

core/computed/metrics/lantern-max-potential-fid.js

@@ -9,13 +9,11 @@ import {makeComputedArtifact} from '../computed-artifact.js';
 import {getComputationDataParams, lanternErrorAdapter} from './lantern-metric.js';
 import {LanternFirstContentfulPaint} from './lantern-first-contentful-paint.js';
 
-/** @typedef {import('../../lib/lantern/Metric.js').Extras} Extras */
-
 class LanternMaxPotentialFID extends Lantern.Metrics.MaxPotentialFID {
   /**
    * @param {LH.Artifacts.MetricComputationDataInput} data
    * @param {LH.Artifacts.ComputedContext} context
-   * @param {Omit<Extras, 'optimistic'>=} extras
+   * @param {Omit<Lantern.Metrics.Extras, 'optimistic'>=} extras
    * @return {Promise<LH.Artifacts.LanternMetric>}
    */
   static async computeMetricWithGraphs(data, context, extras) {

core/computed/metrics/lantern-metric.js

@@ -50,7 +50,7 @@ async function getComputationDataParamsFromTrace(data, context) {
  * @return {never}
  */
 function lanternErrorAdapter(err) {
-  if (!(err instanceof Lantern.Error)) {
+  if (!(err instanceof Lantern.Core.LanternError)) {
     throw err;
   }
 

core/computed/metrics/lantern-speed-index.js

@@ -10,13 +10,11 @@ import {getComputationDataParams, lanternErrorAdapter} from './lantern-metric.js
 import {Speedline} from '../speedline.js';
 import {LanternFirstContentfulPaint} from './lantern-first-contentful-paint.js';
 
-/** @typedef {import('../../lib/lantern/Metric.js').Extras} Extras */
-
 class LanternSpeedIndex extends Lantern.Metrics.SpeedIndex {
   /**
    * @param {LH.Artifacts.MetricComputationDataInput} data
    * @param {LH.Artifacts.ComputedContext} context
-   * @param {Omit<Extras, 'optimistic'>=} extras
+   * @param {Omit<Lantern.Metrics.Extras, 'optimistic'>=} extras
    * @return {Promise<LH.Artifacts.LanternMetric>}
    */
   static async computeMetricWithGraphs(data, context, extras) {

core/computed/metrics/lantern-total-blocking-time.js

@@ -10,13 +10,11 @@ import {LanternFirstContentfulPaint} from './lantern-first-contentful-paint.js';
 import {LanternInteractive} from './lantern-interactive.js';
 import {getComputationDataParams} from './lantern-metric.js';
 
-/** @typedef {import('../../lib/lantern/Metric.js').Extras} Extras */
-
 class LanternTotalBlockingTime extends Lantern.Metrics.TotalBlockingTime {
   /**
    * @param {LH.Artifacts.MetricComputationDataInput} data
    * @param {LH.Artifacts.ComputedContext} context
-   * @param {Omit<Extras, 'optimistic'>=} extras
+   * @param {Omit<Lantern.Metrics.Extras, 'optimistic'>=} extras
    * @return {Promise<LH.Artifacts.LanternMetric>}
    */
   static async computeMetricWithGraphs(data, context, extras) {