Lighthouse analyzes web apps and web pages, collecting modern performance metrics and insights on developer best practices.
Lighthouse is integrated directly into the Chrome DevTools, under the "Lighthouse" panel or can install the lighthouse cli tool. Lighthouse CLI.
As we run lighthouse for any given web url multiple times, its score gets fluctuated because of many reasons like network, pages opened in the other tabs etc. So you will get different scores when we run it. To get close to accurate scores, this package will run the lighthouse n(runlimit) times and generate the report at the end and give you aggregate scores of all the runs and 50th percentile & 90th percentile score to determine the fluctuation in scores.
git clone
cd multi-lighthouse-run
./setup
lh <url/json-file-path> <runlimit> <platform> <options>
platform can be mobile or desktop
options are optional
Example: lh <Any-Valid-URL/Local-JSON-File-Path> 5 desktop
Node version >14
Logging:
--verbose Displays verbose logging [boolean] [default: false]
Configuration:
--save-assets Save the trace contents & devtools logs to disk [boolean] [default: false]
--list-all-audits Prints a list of all available audits and exits [boolean] [default: false]
--list-trace-categories Prints a list of all required trace categories and exits [boolean] [default: false]
--print-config Print the normalized config for the given config and options, then exit. [boolean] [default: false]
--additional-trace-categories Additional categories to capture with the trace (comma-delimited). [string]
--config-path The path to the config JSON.
An example config file: lighthouse-core/config/lr-desktop-config.js [string]
--chrome-flags Custom flags to pass to Chrome (space-delimited). For a full list of flags, see https://bit.ly/chrome-flags
Additionally, use the CHROME_PATH environment variable to use a specific Chrome binary. Requires Chromium version 66.0 or later. If omitted, any detected Chrome Canary or Chrome stable will be used. [string] [default: ""]
--port The port to use for the debugging protocol. Use 0 for a random port [number] [default: 0]
--hostname The hostname to use for the debugging protocol. [string] [default: "localhost"]
--form-factor Determines how performance metrics are scored and if mobile-only audits are skipped. For desktop, --preset=desktop instead. [string] [choices: "mobile", "desktop"]
--screenEmulation Sets screen emulation parameters. See also --preset. Use --screenEmulation.disabled to disable. Otherwise set these 4 parameters individually: --screenEmulation.mobile --screenEmulation.width=360 --screenEmulation.height=640 --screenEmulation.deviceScaleFactor=2
--emulatedUserAgent Sets useragent emulation [string]
--max-wait-for-load The timeout (in milliseconds) to wait before the page is considered done loading and the run should continue. WARNING: Very high values can lead to large traces and instability [number]
--enable-error-reporting Enables error reporting, overriding any saved preference. --no-enable-error-reporting will do the opposite. More: https://github.com/GoogleChrome/lighthouse/blob/master/docs/error-reporting.md [boolean]
--gather-mode, -G Collect artifacts from a connected browser and save to disk. (Artifacts folder path may optionally be provided). If audit-mode is not also enabled, the run will quit early.
--audit-mode, -A Process saved artifacts from disk. (Artifacts folder path may be provided, otherwise defaults to ./latest-run/)
--only-audits Only run the specified audits [array]
--only-categories Only run the specified categories. Available categories: accessibility, best-practices, performance, pwa, seo [array]
--skip-audits Run everything except these audits [array]
--budget-path The path to the budget.json file for LightWallet. [string]
Options:
--version Show version number [boolean]
--help Show help [boolean]
--cli-flags-path The path to a JSON file that contains the desired CLI flags to apply. Flags specified at the command line will still override the file-based ones.
--locale The locale/language the report should be formatted in
--blocked-url-patterns Block any network requests to the specified URL patterns [array]
--disable-storage-reset Disable clearing the browser cache and other storage APIs before a run [boolean]
--throttling-method Controls throttling method [string] [choices: "devtools", "provided", "simulate"]
--throttling
--throttling.rttMs Controls simulated network RTT (TCP layer)
--throttling.throughputKbps Controls simulated network download throughput
--throttling.requestLatencyMs Controls emulated network RTT (HTTP layer)
--throttling.downloadThroughputKbps Controls emulated network download throughput
--throttling.uploadThroughputKbps Controls emulated network upload throughput
--throttling.cpuSlowdownMultiplier Controls simulated + emulated CPU throttling
--extra-headers Set extra HTTP Headers to pass with request
--precomputed-lantern-data-path Path to the file where lantern simulation data should be read from, overwriting the lantern observed estimates for RTT and server latency. [string]
--lantern-data-output-path Path to the file where lantern simulation data should be written to, can be used in a future run with the `precomputed-lantern-data-path` flag. [string]
--plugins Run the specified plugins [array]
--channel [string] [default: "cli"]
--chrome-ignore-default-flags [boolean] [default: false]