apps.apple.com/shared/logger/node_modules/@sentry-internal/tracing/esm/browser/browsertracing.js

import { TRACING_DEFAULTS, addTracingExtensions, extractTraceparentData, startIdleTransaction, getActiveTransaction } from '@sentry/core';
import { logger, baggageHeaderToDynamicSamplingContext, getDomElement } from '@sentry/utils';
import { registerBackgroundTabDetection } from './backgroundtab.js';
import { startTrackingWebVitals, startTrackingLongTasks, startTrackingInteractions, addPerformanceEntries } from './metrics/index.js';
import { defaultRequestInstrumentationOptions, instrumentOutgoingRequests } from './request.js';
import { instrumentRoutingWithDefaults } from './router.js';
import { WINDOW } from './types.js';

const BROWSER_TRACING_INTEGRATION_ID = 'BrowserTracing';

/** Options for Browser Tracing integration */

const DEFAULT_BROWSER_TRACING_OPTIONS = {
  ...TRACING_DEFAULTS,
  markBackgroundTransactions: true,
  routingInstrumentation: instrumentRoutingWithDefaults,
  startTransactionOnLocationChange: true,
  startTransactionOnPageLoad: true,
  enableLongTask: true,
  ...defaultRequestInstrumentationOptions,
};

/**
 * The Browser Tracing integration automatically instruments browser pageload/navigation
 * actions as transactions, and captures requests, metrics and errors as spans.
 *
 * The integration can be configured with a variety of options, and can be extended to use
 * any routing library. This integration uses {@see IdleTransaction} to create transactions.
 */
class BrowserTracing  {
  // This class currently doesn't have a static `id` field like the other integration classes, because it prevented
  // @sentry/tracing from being treeshaken. Tree shakers do not like static fields, because they behave like side effects.
  // TODO: Come up with a better plan, than using static fields on integration classes, and use that plan on all
  // integrations.

  /** Browser Tracing integration options */

  /**
   * @inheritDoc
   */
   __init() {this.name = BROWSER_TRACING_INTEGRATION_ID;}

   __init2() {this._hasSetTracePropagationTargets = false;}

   constructor(_options) {BrowserTracing.prototype.__init.call(this);BrowserTracing.prototype.__init2.call(this);
    addTracingExtensions();

    if ((typeof __SENTRY_DEBUG__ === 'undefined' || __SENTRY_DEBUG__)) {
      this._hasSetTracePropagationTargets = !!(
        _options &&
        // eslint-disable-next-line deprecation/deprecation
        (_options.tracePropagationTargets || _options.tracingOrigins)
      );
    }

    this.options = {
      ...DEFAULT_BROWSER_TRACING_OPTIONS,
      ..._options,
    };

    // Special case: enableLongTask can be set in _experiments
    // TODO (v8): Remove this in v8
    if (this.options._experiments.enableLongTask !== undefined) {
      this.options.enableLongTask = this.options._experiments.enableLongTask;
    }

    // TODO (v8): remove this block after tracingOrigins is removed
    // Set tracePropagationTargets to tracingOrigins if specified by the user
    // In case both are specified, tracePropagationTargets takes precedence
    // eslint-disable-next-line deprecation/deprecation
    if (_options && !_options.tracePropagationTargets && _options.tracingOrigins) {
      // eslint-disable-next-line deprecation/deprecation
      this.options.tracePropagationTargets = _options.tracingOrigins;
    }

    this._collectWebVitals = startTrackingWebVitals();
    if (this.options.enableLongTask) {
      startTrackingLongTasks();
    }
    if (this.options._experiments.enableInteractions) {
      startTrackingInteractions();
    }
  }

  /**
   * @inheritDoc
   */
   setupOnce(_, getCurrentHub) {
    this._getCurrentHub = getCurrentHub;
    const hub = getCurrentHub();
    const client = hub.getClient();
    const clientOptions = client && client.getOptions();

    const {
      routingInstrumentation: instrumentRouting,
      startTransactionOnLocationChange,
      startTransactionOnPageLoad,
      markBackgroundTransactions,
      traceFetch,
      traceXHR,
      shouldCreateSpanForRequest,
      _experiments,
    } = this.options;

    const clientOptionsTracePropagationTargets = clientOptions && clientOptions.tracePropagationTargets;
    // There are three ways to configure tracePropagationTargets:
    // 1. via top level client option `tracePropagationTargets`
    // 2. via BrowserTracing option `tracePropagationTargets`
    // 3. via BrowserTracing option `tracingOrigins` (deprecated)
    //
    // To avoid confusion, favour top level client option `tracePropagationTargets`, and fallback to
    // BrowserTracing option `tracePropagationTargets` and then `tracingOrigins` (deprecated).
    // This is done as it minimizes bundle size (we don't have to have undefined checks).
    //
    // If both 1 and either one of 2 or 3 are set (from above), we log out a warning.
    const tracePropagationTargets = clientOptionsTracePropagationTargets || this.options.tracePropagationTargets;
    if ((typeof __SENTRY_DEBUG__ === 'undefined' || __SENTRY_DEBUG__) && this._hasSetTracePropagationTargets && clientOptionsTracePropagationTargets) {
      logger.warn(
        '[Tracing] The `tracePropagationTargets` option was set in the BrowserTracing integration and top level `Sentry.init`. The top level `Sentry.init` value is being used.',
      );
    }

    instrumentRouting(
      (context) => {
        const transaction = this._createRouteTransaction(context);

        this.options._experiments.onStartRouteTransaction &&
          this.options._experiments.onStartRouteTransaction(transaction, context, getCurrentHub);

        return transaction;
      },
      startTransactionOnPageLoad,
      startTransactionOnLocationChange,
    );

    if (markBackgroundTransactions) {
      registerBackgroundTabDetection();
    }

    if (_experiments.enableInteractions) {
      this._registerInteractionListener();
    }

    instrumentOutgoingRequests({
      traceFetch,
      traceXHR,
      tracePropagationTargets,
      shouldCreateSpanForRequest,
      _experiments: {
        enableHTTPTimings: _experiments.enableHTTPTimings,
      },
    });
  }

  /** Create routing idle transaction. */
   _createRouteTransaction(context) {
    if (!this._getCurrentHub) {
      (typeof __SENTRY_DEBUG__ === 'undefined' || __SENTRY_DEBUG__) &&
        logger.warn(`[Tracing] Did not create ${context.op} transaction because _getCurrentHub is invalid.`);
      return undefined;
    }

    const { beforeNavigate, idleTimeout, finalTimeout, heartbeatInterval } = this.options;

    const isPageloadTransaction = context.op === 'pageload';

    const sentryTraceMetaTagValue = isPageloadTransaction ? getMetaContent('sentry-trace') : null;
    const baggageMetaTagValue = isPageloadTransaction ? getMetaContent('baggage') : null;

    const traceParentData = sentryTraceMetaTagValue ? extractTraceparentData(sentryTraceMetaTagValue) : undefined;
    const dynamicSamplingContext = baggageMetaTagValue
      ? baggageHeaderToDynamicSamplingContext(baggageMetaTagValue)
      : undefined;

    const expandedContext = {
      ...context,
      ...traceParentData,
      metadata: {
        ...context.metadata,
        dynamicSamplingContext: traceParentData && !dynamicSamplingContext ? {} : dynamicSamplingContext,
      },
      trimEnd: true,
    };

    const modifiedContext = typeof beforeNavigate === 'function' ? beforeNavigate(expandedContext) : expandedContext;

    // For backwards compatibility reasons, beforeNavigate can return undefined to "drop" the transaction (prevent it
    // from being sent to Sentry).
    const finalContext = modifiedContext === undefined ? { ...expandedContext, sampled: false } : modifiedContext;

    // If `beforeNavigate` set a custom name, record that fact
    finalContext.metadata =
      finalContext.name !== expandedContext.name
        ? { ...finalContext.metadata, source: 'custom' }
        : finalContext.metadata;

    this._latestRouteName = finalContext.name;
    this._latestRouteSource = finalContext.metadata && finalContext.metadata.source;

    if (finalContext.sampled === false) {
      (typeof __SENTRY_DEBUG__ === 'undefined' || __SENTRY_DEBUG__) &&
        logger.log(`[Tracing] Will not send ${finalContext.op} transaction because of beforeNavigate.`);
    }

    (typeof __SENTRY_DEBUG__ === 'undefined' || __SENTRY_DEBUG__) && logger.log(`[Tracing] Starting ${finalContext.op} transaction on scope`);

    const hub = this._getCurrentHub();
    const { location } = WINDOW;

    const idleTransaction = startIdleTransaction(
      hub,
      finalContext,
      idleTimeout,
      finalTimeout,
      true,
      { location }, // for use in the tracesSampler
      heartbeatInterval,
    );
    idleTransaction.registerBeforeFinishCallback(transaction => {
      this._collectWebVitals();
      addPerformanceEntries(transaction);
    });

    return idleTransaction ;
  }

  /** Start listener for interaction transactions */
   _registerInteractionListener() {
    let inflightInteractionTransaction;
    const registerInteractionTransaction = () => {
      const { idleTimeout, finalTimeout, heartbeatInterval } = this.options;
      const op = 'ui.action.click';

      const currentTransaction = getActiveTransaction();
      if (currentTransaction && currentTransaction.op && ['navigation', 'pageload'].includes(currentTransaction.op)) {
        (typeof __SENTRY_DEBUG__ === 'undefined' || __SENTRY_DEBUG__) &&
          logger.warn(
            `[Tracing] Did not create ${op} transaction because a pageload or navigation transaction is in progress.`,
          );
        return undefined;
      }

      if (inflightInteractionTransaction) {
        inflightInteractionTransaction.setFinishReason('interactionInterrupted');
        inflightInteractionTransaction.finish();
        inflightInteractionTransaction = undefined;
      }

      if (!this._getCurrentHub) {
        (typeof __SENTRY_DEBUG__ === 'undefined' || __SENTRY_DEBUG__) && logger.warn(`[Tracing] Did not create ${op} transaction because _getCurrentHub is invalid.`);
        return undefined;
      }

      if (!this._latestRouteName) {
        (typeof __SENTRY_DEBUG__ === 'undefined' || __SENTRY_DEBUG__) &&
          logger.warn(`[Tracing] Did not create ${op} transaction because _latestRouteName is missing.`);
        return undefined;
      }

      const hub = this._getCurrentHub();
      const { location } = WINDOW;

      const context = {
        name: this._latestRouteName,
        op,
        trimEnd: true,
        metadata: {
          source: this._latestRouteSource || 'url',
        },
      };

      inflightInteractionTransaction = startIdleTransaction(
        hub,
        context,
        idleTimeout,
        finalTimeout,
        true,
        { location }, // for use in the tracesSampler
        heartbeatInterval,
      );
    };

    ['click'].forEach(type => {
      addEventListener(type, registerInteractionTransaction, { once: false, capture: true });
    });
  }
}

/** Returns the value of a meta tag */
function getMetaContent(metaName) {
  // Can't specify generic to `getDomElement` because tracing can be used
  // in a variety of environments, have to disable `no-unsafe-member-access`
  // as a result.
  const metaTag = getDomElement(`meta[name=${metaName}]`);
  // eslint-disable-next-line @typescript-eslint/no-unsafe-member-access
  return metaTag ? metaTag.getAttribute('content') : null;
}

export { BROWSER_TRACING_INTEGRATION_ID, BrowserTracing, getMetaContent };
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