sentry/static/app/gettingStartedDocs/node/connect.tsx

import {StepType} from 'sentry/components/onboarding/gettingStartedDoc/step';
import {
  Docs,
  DocsParams,
  OnboardingConfig,
} from 'sentry/components/onboarding/gettingStartedDoc/types';
import {getUploadSourceMapsStep} from 'sentry/components/onboarding/gettingStartedDoc/utils';
import {getJSServerMetricsOnboarding} from 'sentry/components/onboarding/gettingStartedDoc/utils/metricsOnboarding';
import {ProductSolution} from 'sentry/components/onboarding/productSelection';
import {t} from 'sentry/locale';
import {
  getDefaultNodeImports,
  getInstallConfig,
  ProductSelectionMap,
} from 'sentry/utils/gettingStartedDocs/node';

type Params = DocsParams;

const productSelection = (params: Params): ProductSelectionMap => {
  return {
    [ProductSolution.ERROR_MONITORING]: true,
    [ProductSolution.PROFILING]: params.isProfilingSelected,
    [ProductSolution.PERFORMANCE_MONITORING]: params.isPerformanceSelected,
    [ProductSolution.SESSION_REPLAY]: params.isReplaySelected,
  };
};

const getSdkSetupSnippet = (params: Params) => `
${getDefaultNodeImports({productSelection: productSelection(params)}).join('\n')}
import connect from "connect";

// Configure Sentry before doing anything else
Sentry.init({
  dsn: "${params.dsn}",
  integrations: [${
    params.isProfilingSelected
      ? `
      new ProfilingIntegration(),`
      : ''
  }
],${
  params.isPerformanceSelected
    ? `
      // Performance Monitoring
      tracesSampleRate: 1.0, //  Capture 100% of the transactions`
    : ''
}${
  params.isProfilingSelected
    ? `
    // Set sampling rate for profiling - this is relative to tracesSampleRate
    profilesSampleRate: 1.0,`
    : ''
}
});

function mainHandler(req, res) {
  throw new Error("My first Sentry error!");
}

function onError(err, req, res, next) {
  // The error id is attached to \`res.sentry\` to be returned
  // and optionally displayed to the user for support.
  res.statusCode = 500;
  res.end(res.sentry + "\\n");
}

connect(
  // The request handler be the first item
  Sentry.Handlers.requestHandler(),

  connect.bodyParser(),
  connect.cookieParser(),
  mainHandler,

  // The error handler must be before any other error middleware
  Sentry.Handlers.errorHandler(),

  // Optional fallthrough error handler
  onError
).listen(3000);
`;

const onboarding: OnboardingConfig = {
  install: params => [
    {
      type: StepType.INSTALL,
      description: t('Add the Sentry Node SDK as a dependency:'),
      configurations: getInstallConfig(params),
    },
  ],
  configure: params => [
    {
      type: StepType.CONFIGURE,
      description: t('Configure Sentry as a middleware:'),
      configurations: [
        {
          language: 'javascript',
          code: getSdkSetupSnippet(params),
        },
      ],
    },
    getUploadSourceMapsStep({
      guideLink: 'https://docs.sentry.io/platforms/node/guides/connect/sourcemaps/',
      ...params,
    }),
  ],
  verify: () => [],
};

const docs: Docs = {
  onboarding,
  customMetricsOnboarding: getJSServerMetricsOnboarding(),
};

export default docs;