Lighthouse configuration

General

User flow wraps lighthouse and executes actions against chromium while measuring. Lighthouse itself can get configured over a json object where any detail regards settings, audits and postprocessing can be placed.

The official docs on how to configure lighthouse are located in their repository's docs. The default lighthouse config can be found in their repository's source.

The CLI will start lighthouse as with its default configuration.

Configuration Options

The CLI provides multiple ways of configuration, every one with a different granularity.

Places to put configurations:

in a .user-flowrc.json - used for all flows (global)
in the console as CLI param - used for all flows, overwrites rc file (global)
in a <user-flow-name>.uf.mts - used for 1 specific flow (local)

Local configurations will overwrite global configurations.

Custom configurations can be provided over a external .json file using --configPath <path/to/config.json>.
This option is also available in the .user-flowrc.json file under the collect.configPath property.

It is also possible to provide the configurations directly as JSON object in the .user-flowrc.json file under the collect.config property.

The configPath property is handy when all parameters should exist as CLI params only.

Configuration option short-hands

As the configuration object can get quite big lighthouse provides a couple of short-hands to directly configure specific parts over a flag.
The user-flow CLI ports perts of this behavior.

Those options can be used similar to the general configurations globally as well as locally.

Options

RC properties

Used in the rc.json file directly.

Option	Type	Default	Description
`collect.configPath`	`string`	n/a	Path to the lighthouse `config.json` file
`collect.config`	`object`	n/a	The lighthouse configuration as `JSON` object

CLI params

Used in the console as user-flow collect <param>.

Option	Type	Default	Description
`-c`, `--configPath`	`string`	n/a	Path to the lighthouse `config.json` file

Configuration over RC properties

collect.configPath property

Property	Type	Default
`collect.configPath`	`string`	n/a

Usage:

{
  "collect": {
    "configPath": "./config.json",
    # ...  
  },
  # ...
}

Description:
If a lighthouse configuration exists as separate file you can use the collect.configPath to use it. The path is, same as all other paths, relative to the execution context of the CLI.

If possible configuration file looks like this:

./config.json

{
 "extends": "lighthouse:default",
   "settings": {
     "onlyAudits": [
       "first-meaningful-paint",
       "speed-index",
       "interactive"
     ]
   }
}

The usage of it in the rc file looks like this:

./.user-flowrc.json

{
  "collect": {
    "configPath": "./config.json",
    # ...  
  },
  # ...
}

collect.config property

Property	Type	Default
`collect.config`	`object`	n/a

Usage:

{
  "collect": {
    "config": {
      "extends": "lighthouse:default",
      "settings": {
        "onlyAudits": [
          "first-meaningful-paint",
          "speed-index",
          "interactive"
        ]
      }
    },
    # ...  
  },
  # ...
}

Description:

You can directly use a lighthouse config object in the rc file by placing it under the collect.config property.

./.user-flowrc.json

{
  "collect": {
    "config": {
        "extends": "lighthouse:default",
        "settings": {
          "onlyAudits": [
            "first-meaningful-paint",
            "speed-index",
            "interactive"
          ]
        }
    },
    # ...  
  },
  # ...
}