How to add custom weight for audit ref ids for categories

[ashishkshrivastava]

Hi

I am trying to add custom weight for audit ref ids in categories (performance) using a custom config js. I would like to calculate performance on custom weight instead of using the default lighthouse weight. I also observe after adding the below change , in the report all the audit ref duplicated. I am using lighthouse version 6.

Below are the details of my custom config.

module.exports = {
  extends: 'lighthouse:default',
  categories: {
    performance: {
      title: 'Performance',
      description: 'This category judges your performance',
      auditRefs: [
        {id: 'total-blocking-time', weight: 10, group: 'metrics'},
        {id: 'first-contentful-paint', weight: 20, group: 'metrics'},
        {id: 'interactive', weight: 25, group: 'metrics'},
        {id: 'speed-index', weight: 25, group: 'metrics'},
        {id: 'largest-contentful-paint', weight: 5, group: 'metrics'},
        {id: 'cumulative-layout-shift', weight: 15, group: 'metrics'}
      ],
    }
  }
};

Thanks & Regards
Ashish

[patrickhulce]

If you want your category to replace the default performance category, then you can't extend the default config. Extension for categories is additive.

tl;dr remove extends: 'lighthouse:default' if you want to replace a category.

[ashishkshrivastava]

After removing the extends: 'lighthouse:default' I am getting error in pipeline.

01 Dec 2020 16:21:00 GMT ChromeLauncher Killing Chrome instance 82
Runtime error encountered: could not find total-blocking-time audit for category performance
Error: **could not find total-blocking-time audit for category performance**
    at /usr/local/lib/node_modules/@lhci/cli/node_modules/lighthouse/lighthouse-core/config/config.js:125:15
    at Array.forEach (<anonymous>)
    at /usr/local/lib/node_modules/@lhci/cli/node_modules/lighthouse/lighthouse-core/config/config.js:118:38
    at Array.forEach (<anonymous>)
    at assertValidCategories (/usr/local/lib/node_modules/@lhci/cli/node_modules/lighthouse/lighthouse-core/config/config.js:117:27)

Please guide me if i am missing any other configuration

[patrickhulce]

Well yes that's not the only change to make, if you're not extending anymore but still want to use those audits you'll need to copy what you need from the default config. Those sorts of questions and troubleshooting are best left for another forum though :) (moved from issue to discussions)

[ashishkshrivastava]

Thanks for your response.