Question 1

How do I set up PWMetrics to send results to Google Sheets?

Accepted Answer

You need to create a Google Developer project, obtain OAuth credentials, and configure the spreadsheet ID and client secret in the pwmetrics config file, as detailed in the 'Defining submit' section of the README. It involves copying a template spreadsheet and setting up API access.

Question 2

Should I use PWMetrics or Lighthouse CI for performance testing?

Accepted Answer

The author recommends Lighthouse CI for better support and features, as PWMetrics is deprecated. Lighthouse CI offers more active development, native CI integrations, and advanced capabilities, making it the better choice for new projects.

Question 3

How can I run PWMetrics in a headless server environment?

Accepted Answer

Use the --chromeFlags option with '--headless' in the CLI or set it in the configuration flags to run Chrome without a GUI. This allows PWMetrics to execute in automated CI/CD servers without a display.

Question 4

What are the default performance metrics measured by PWMetrics?

Accepted Answer

It focuses on key user-centric metrics including First Contentful Paint, Largest Contentful Paint, Time to Interactive, Speed Index, and Total Blocking Time, as defined in the metrics object in the lib directory.

Question 5

Can I integrate PWMetrics with GitHub Actions easily?

Accepted Answer

Not directly; the README suggests using Lighthouse CI Action for seamless integration. PWMetrics requires manual scripting in GitHub Actions, whereas Lighthouse CI Action provides pre-built workflows and better support.

Question 6

How do I assert performance budgets with PWMetrics in CI?

Accepted Answer

Define expectations in the config file with warn and error thresholds for specific metrics, then use the --expectations and --fail-on-error flags to fail the build if thresholds are exceeded, enabling automated compliance checks.

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