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All rights reserved.\n// Use of this source code is governed by a BSD-style license that can be\n// found in the LICENSE file.\n\nimport * as i18n from '../../../core/i18n/i18n.js';\nimport * as LegacyJavaScriptLib from '../../../third_party/legacy-javascript/legacy-javascript.js';\nimport type * as Handlers from '../handlers/handlers.js';\nimport * as Helpers from '../helpers/helpers.js';\nimport type * as Types from '../types/types.js';\n\nimport {estimateCompressionRatioForScript, metricSavingsForWastedBytes} from './Common.js';\nimport {\n  InsightCategory,\n  InsightKeys,\n  type InsightModel,\n  type InsightSetContext,\n  type PartialInsightModel,\n} from './types.js';\n\nconst {detectLegacyJavaScript} = LegacyJavaScriptLib.LegacyJavaScript;\n\nexport const UIStrings = {\n  /**\n   * @description Title of an insight that identifies polyfills for modern JavaScript features, and recommends their removal.\n   */\n  title: 'Legacy JavaScript',\n  /**\n   * @description Description of an insight that identifies polyfills for modern JavaScript features, and recommends their removal.\n   */\n  description:\n      'Polyfills and transforms enable older browsers to use new JavaScript features. However, many aren\\'t necessary for modern browsers. Consider modifying your JavaScript build process to not transpile [Baseline](https://web.dev/articles/baseline-and-polyfills) features, unless you know you must support older browsers. [Learn why most sites can deploy ES6+ code without transpiling](https://philipwalton.com/articles/the-state-of-es5-on-the-web/)',\n  /** Label for a column in a data table; entries will be the individual JavaScript scripts. */\n  columnScript: 'Script',\n  /** Label for a column in a data table; entries will be the number of wasted bytes (aka the estimated savings in terms of bytes). */\n  columnWastedBytes: 'Wasted bytes',\n} as const;\n\nconst str_ = i18n.i18n.registerUIStrings('models/trace/insights/LegacyJavaScript.ts', UIStrings);\nexport const i18nString = i18n.i18n.getLocalizedString.bind(undefined, str_);\n\nexport interface PatternMatchResult {\n  name: string;\n  line: number;\n  column: number;\n}\n\ninterface LegacyJavaScriptResult {\n  matches: PatternMatchResult[];\n  estimatedByteSavings: number;\n}\n\ntype LegacyJavaScriptResults = Map<Handlers.ModelHandlers.Scripts.Script, LegacyJavaScriptResult>;\n\nexport type LegacyJavaScriptInsightModel = InsightModel<typeof UIStrings, {\n  legacyJavaScriptResults: LegacyJavaScriptResults,\n}>;\n\nconst BYTE_THRESHOLD = 5000;\n\nfunction finalize(partialModel: PartialInsightModel<LegacyJavaScriptInsightModel>): LegacyJavaScriptInsightModel {\n  const requests = [...partialModel.legacyJavaScriptResults.keys()].map(script => script.request).filter(e => !!e);\n\n  return {\n    insightKey: InsightKeys.LEGACY_JAVASCRIPT,\n    strings: UIStrings,\n    title: i18nString(UIStrings.title),\n    description: i18nString(UIStrings.description),\n    category: InsightCategory.ALL,\n    state: requests.length ? 'fail' : 'pass',\n    relatedEvents: [...new Set(requests)],\n    ...partialModel,\n  };\n}\n\nexport function isLegacyJavaScript(model: InsightModel): model is LegacyJavaScriptInsightModel {\n  return model.insightKey === InsightKeys.LEGACY_JAVASCRIPT;\n}\n\nexport function generateInsight(\n    parsedTrace: Handlers.Types.ParsedTrace, context: InsightSetContext): LegacyJavaScriptInsightModel {\n  const scripts = parsedTrace.Scripts.scripts.filter(script => {\n    if (script.frame !== context.frameId) {\n      return false;\n    }\n\n    if (script.url?.startsWith('chrome-extension://')) {\n      return false;\n    }\n\n    return Helpers.Timing.timestampIsInBounds(context.bounds, script.ts);\n  });\n\n  const legacyJavaScriptResults: LegacyJavaScriptResults = new Map();\n  const wastedBytesByRequestId = new Map<string, number>();\n\n  for (const script of scripts) {\n    if (!script.content || script.content.length < BYTE_THRESHOLD) {\n      continue;\n    }\n\n    const result = detectLegacyJavaScript(script.content, script.sourceMap);\n    if (result.estimatedByteSavings < BYTE_THRESHOLD) {\n      continue;\n    }\n\n    // Translate from resource size to transfer size.\n    const compressionRatio = estimateCompressionRatioForScript(script);\n    const transferSize = Math.round(result.estimatedByteSavings * compressionRatio);\n    result.estimatedByteSavings = transferSize;\n\n    legacyJavaScriptResults.set(script, result);\n\n    if (script.request) {\n      const requestId = script.request.args.data.requestId;\n      wastedBytesByRequestId.set(requestId, transferSize);\n    }\n  }\n\n  const sorted =\n      new Map([...legacyJavaScriptResults].sort((a, b) => b[1].estimatedByteSavings - a[1].estimatedByteSavings));\n\n  return finalize({\n    legacyJavaScriptResults: sorted,\n    metricSavings: metricSavingsForWastedBytes(wastedBytesByRequestId, context),\n    wastedBytes: wastedBytesByRequestId.values().reduce((acc, cur) => acc + cur, 0),\n  });\n}\nexport function createOverlays(model: LegacyJavaScriptInsightModel): Types.Overlays.Overlay[] {\n  return [...model.legacyJavaScriptResults.keys()].map(script => script.request).filter(e => !!e).map(request => {\n    return {\n      type: 'ENTRY_OUTLINE',\n      entry: request,\n      outlineReason: 'ERROR',\n    };\n  });\n}\n"]}