react-lighthouse-viewer
If you have generated lighthouse report using lighthouse CLI, you can use this component to render the JSON report inside React.
Installation
yarn add react-lighthouse-viewerUsage
import React from 'react';
import { render } from 'react-dom';
import ReportViewer from 'react-lighthouse-viewer';
import jsonReport from './report.json';
const App = () => (
<ReportViewer json={jsonReport} />
);
render(<App />, document.getElementById("root"));To generate lighthouse reports, use CLI
Install lighthouse globally
npm install -g lighthouseRun CLI: lighthouse https://blencorp.com --output=json --output-path=./report.json
By default, Lighthouse writes the report to an HTML file. You can control the output format by passing flags.
CLI options
$ lighthouse --help
lighthouse <url>
Logging:
--verbose Displays verbose logging [boolean]
--quiet Displays no progress, debug logs or errors [boolean]
Configuration:
--save-assets Save the trace & devtools log to disk [boolean]
--list-all-audits Prints a list of all available audits and exits [boolean]
--list-trace-categories Prints a list of all required trace categories and exits [boolean]
--print-config Print the normalized config for the given config and options, then exit. [boolean]
--additional-trace-categories Additional categories to capture with the trace (comma-delimited).
--config-path The path to the config JSON.
--chrome-flags Custom flags to pass to Chrome (space-delimited). For a full list of flags, see
https://peter.sh/experiments/chromium-command-line-switches/.
Environment variables:
CHROME_PATH: Explicit path of intended Chrome binary. If set must point to an executable of a build of
Chromium version 66.0 or later. By default, any detected Chrome Canary or Chrome (stable) will be launched.
[default: ""]
--port The port to use for the debugging protocol. Use 0 for a random port [default: 0]
--preset Use a built-in configuration. [choices: "full", "perf", "mixed-content"]
--hostname The hostname to use for the debugging protocol. [default: "localhost"]
--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 [default: 45000]
--emulated-form-factor Controls the emulated device form factor (mobile vs. desktop) if not disabled [choices: "mobile", "desktop", "none"] [default: "mobile"]
--enable-error-reporting Enables error reporting, overriding any saved preference. --no-enable-error-reporting will do the opposite. More:
https://git.io/vFFTO
--gather-mode, -G Collect artifacts from a connected browser and save to disk. If audit-mode is not also enabled, the run will quit
early. [boolean]
--audit-mode, -A Process saved artifacts from disk [boolean]
Output:
--output Reporter for the results, supports multiple values [choices: "csv", "json", "html"] [default: "html"]
--output-path The file path to output the results. Use 'stdout' to write to stdout.
If using JSON or CSV output, default is stdout.
If using HTML output, default is a file in the working directory with a name based on the test URL and date.
If using multiple outputs, --output-path is appended with the standard extension for each output type. "reports/my-run" -> "reports/my-run.report.html", "reports/my-run.report.json", etc.
Example: --output-path=./lighthouse-results.html
--view Open HTML report in your browser [boolean]
Options:
--help Show help [boolean]
--version Show version number [boolean]
--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]
--disable-device-emulation Disable all device form factor emulation. Deprecated: use --emulated-form-factor=none instead [boolean]
--throttling-method Controls throttling method [choices: "devtools", "provided", "simulate"]
--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 [string]
Examples:
lighthouse <url> --view Opens the HTML report in a browser after the run completes
lighthouse <url> --config-path=./myconfig.js Runs Lighthouse with your own configuration: custom audits, report
generation, etc.
lighthouse <url> --output=json --output-path=./report.json --save-assets Save trace, devtoolslog, and named JSON report.
lighthouse <url> --disable-device-emulation Disable device emulation and all throttling.
--throttling-method=provided
lighthouse <url> --chrome-flags="--window-size=412,660" Launch Chrome with a specific window size
lighthouse <url> --quiet --chrome-flags="--headless" Launch Headless Chrome, turn off logging
lighthouse <url> --extra-headers "{\"Cookie\":\"monster=blue\"}" Stringify\'d JSON HTTP Header key/value pairs to send in requests
lighthouse <url> --extra-headers=./path/to/file.json Path to JSON file of HTTP Header key/value pairs to send in requests
For more information on Lighthouse, see https://developers.google.com/web/tools/lighthouse/.Cool Guide by Brad Stiff
A guide to building a React component with webpack 4, publishing to npm, and deploying the demo to GitHub Pages Read more
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