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How to use _onStyleSheet method in Puppeteer

Best JavaScript code snippet using puppeteer

Coverage.js

Source:Coverage.js

...176  }177  /**178   * @param {!Object} event179   */180  async _onStyleSheet(event) {181    const header = event.header;182    // Ignore anonymous scripts183    if (!header.sourceURL)184      return;185    try {186      const response = await this._client.send('CSS.getStyleSheetText', {styleSheetId: header.styleSheetId});187      this._stylesheetURLs.set(header.styleSheetId, header.sourceURL);188      this._stylesheetSources.set(header.styleSheetId, response.text);189    } catch (e) {190      // This might happen if the page has already navigated away.191      debugError(e);192    }193  }194  /**...

crCoverage.js

Source:crCoverage.js

...141    if (!this._resetOnNavigation) return;142    this._stylesheetURLs.clear();143    this._stylesheetSources.clear();144  }145  async _onStyleSheet(event) {146    const header = event.header; // Ignore anonymous scripts147    if (!header.sourceURL) return; // This might fail if the page has already navigated away.148    const response = await this._client._sendMayFail('CSS.getStyleSheetText', {149      styleSheetId: header.styleSheetId150    });151    if (response) {152      this._stylesheetURLs.set(header.styleSheetId, header.sourceURL);153      this._stylesheetSources.set(header.styleSheetId, response.text);154    }155  }156  async stop() {157    (0, _utils.assert)(this._enabled, 'CSSCoverage is not enabled');158    this._enabled = false;159    const ruleTrackingResponse = await this._client.send('CSS.stopRuleUsageTracking');...

CSSCoverage.js

Source:CSSCoverage.js

1const { helper, debugError, assert } = require('../helper')2const { convertToDisjointRanges } = require('../__shared')3class CSSCoverage {4  /**5   * @param {!Chrome|CRIConnection|CDPSession|Object} client6   */7  constructor (client) {8    this._client = client9    this._enabled = false10    this._stylesheetURLs = new Map()11    this._stylesheetSources = new Map()12    this._eventListeners = []13    this._resetOnNavigation = false14  }15  /**16   * @param {{resetOnNavigation?: boolean}=} options17   */18  async start (options = {}) {19    assert(!this._enabled, 'CSSCoverage is already enabled')20    const { resetOnNavigation = true } = options21    this._resetOnNavigation = resetOnNavigation22    this._enabled = true23    this._stylesheetURLs.clear()24    this._stylesheetSources.clear()25    this._eventListeners = [26      helper.addEventListener(27        this._client,28        'CSS.styleSheetAdded',29        this._onStyleSheet.bind(this)30      ),31      helper.addEventListener(32        this._client,33        'Runtime.executionContextsCleared',34        this._onExecutionContextsCleared.bind(this)35      )36    ]37    await Promise.all([38      this._client.send('DOM.enable'),39      this._client.send('CSS.enable'),40      this._client.send('CSS.startRuleUsageTracking')41    ])42  }43  _onExecutionContextsCleared () {44    if (!this._resetOnNavigation) return45    this._stylesheetURLs.clear()46    this._stylesheetSources.clear()47  }48  /**49   * @param {!Object} event50   */51  async _onStyleSheet (event) {52    const header = event.header53    // Ignore anonymous scripts54    if (!header.sourceURL) return55    try {56      const response = await this._client.send('CSS.getStyleSheetText', {57        styleSheetId: header.styleSheetId58      })59      this._stylesheetURLs.set(header.styleSheetId, header.sourceURL)60      this._stylesheetSources.set(header.styleSheetId, response.text)61    } catch (e) {62      // This might happen if the page has already navigated away.63      debugError(e)64    }65  }66  /**67   * @return {Promise<Array<CoverageEntry>>}68   */69  async stop () {70    assert(this._enabled, 'CSSCoverage is not enabled')71    this._enabled = false72    const ruleTrackingResponse = await this._client.send(73      'CSS.stopRuleUsageTracking'74    )75    await Promise.all([76      this._client.send('CSS.disable'),77      this._client.send('DOM.disable')78    ])79    helper.removeEventListeners(this._eventListeners)80    // aggregate by styleSheetId81    const styleSheetIdToCoverage = new Map()82    for (const entry of ruleTrackingResponse.ruleUsage) {83      let ranges = styleSheetIdToCoverage.get(entry.styleSheetId)84      if (!ranges) {85        ranges = []86        styleSheetIdToCoverage.set(entry.styleSheetId, ranges)87      }88      ranges.push({89        startOffset: entry.startOffset,90        endOffset: entry.endOffset,91        count: entry.used ? 1 : 092      })93    }94    const coverage = []95    for (const styleSheetId of this._stylesheetURLs.keys()) {96      const url = this._stylesheetURLs.get(styleSheetId)97      const text = this._stylesheetSources.get(styleSheetId)98      const ranges = convertToDisjointRanges(99        styleSheetIdToCoverage.get(styleSheetId) || []100      )101      coverage.push({ url, ranges, text })102    }103    return coverage104  }105}...

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