Progressive web metrics at your fingertipz. 💅
CLI tool and lib to gather performance metrics via Lighthouse. IN BETA.
Documentation on these metrics in the works. If you hit bugs in the metrics collection, report at Lighthouse issues. How to use article
$ yarn global add pwmetrics
# or
$ yarn add --dev pwmetrics$ pwmetrics <url> <flags>
pwmetrics http://example.com/
# --runs=n Does n runs (eg. 3, 5), and reports the median run's numbers.
# Median run selected by run with the median TTI.
pwmetrics http://example.com/ --runs=3
# --json Reports json details to stdout.
pwmetrics http://example.com/ --json
# returns...
# {runs: [{
# "timings": [
# {
# "name": "First Contentful Paint",
# "value": 289.642
# },
# {
# "name": "First Meaningful Paint",
# "value": 289.6
# },
# ...
# --output-path File path to save results.
pwmetrics http://example.com/ --output-path='pathToFile/file.json'
# --config Provide configuration (defaults to `package.json`). See _Defining config_ below.
pwmetrics --config=pwmetrics-config.js
# --submit Submit results to Google Sheets. See _Defining submit_ below.
pwmetrics --submit
# --upload Upload Lighthouse traces to Google Drive. See _Defining upload_ below.
pwmetrics --upload
# --view View Lighthouse traces, which were uploaded to Google Drive, in DevTools. See _Defining view_ below.
pwmetrics --view
##
## CLI options useful for CI
##
# --expectations Assert metrics results against provides values. See _Defining expectations_ below.
pwmetrics --expectations
# run pwmetrics with config in package.json
pwmetrics --configpackage.json
...
"pwmetrics": {
"url": "http://example.com/",
// other configuration options
}
...
# run pwmetrics with config in pwmetrics-config.js
pwmetrics --config=pwmetrics-config.jspwmetrics-config.js
module.exports = {
url: 'http://example.com/',
// other configuration options. Read _All available configuration options_
}pwmetrics-config.js
module.exports = {
url: 'http://example.com/',
flags: { // AKA feature flags
runs: '3', // number or runs
submit: true, // turn on submitting to Google Sheets
upload: true, // turn on uploading to Google Drive
view: true, // open uploaded traces to Google Drive in DevTools
expectations: true // turn on assertation metrics results against provides values
chromePath: '/Applications/Google\ Chrome\ Canary.app/Contents/MacOS/Google\ Chrome\ Canary' //optional path to specific Chrome location
chromeFlags: [] // custom flags to pass to Chrome. For a full list of flags, see http://peter.sh/experiments/chromium-command-line-switches/.
// Note: pwmetrics supports all flags from Lighthouse
},
expectations: {
// these expectations values are examples, for your cases set your own
// it's not required to use all metrics, you can use just a few of them
// Read _Available metrics_ where all keys are defined
ttfcp: {
warn: '>=1500',
error: '>=2000'
},
ttfmp: {
warn: '>=2000',
error: '>=3000'
},
fv: {
...
},
psi: {
...
},
vc85: {
...
},
vs100: {
...
},
ttfi: {
...
},
ttci: {
...
}
},
sheets: {
type: 'GOOGLE_SHEETS', // sheets service type. Available types: GOOGLE_SHEETS
options: {
spreadsheetId: 'sheet_id',
tableName: 'data'
}
},
clientSecret: {
// Data object. Can be get
// either
// by (using everything in step 1 here)[https://developers.google.com/sheets/api/quickstart/nodejs#step_1_turn_on_the_api_name]
// or
// by (using everything in step 1 here)[https://developers.google.com/drive/v3/web/quickstart/nodejs]
}
}Recipes for using with CI
# run pwmetrics with config in package.json
pwmetrics --expectationspackage.json
...
"pwmetrics": {
"url": "http://example.com/",
"expectations": {
...
}
}
...
# run pwmetrics with config in pwmetrics-config.js
pwmetrics --expectations --config=pwmetrics-config.jsSubmit results to Google Sheets
Instructions:
- Copy this spreadsheet.
- Copy the ID of the spreadsheet into the config as value of
sheets.options.spreadsheetIdproperty. - Setup Google Developer project and get credentials. (everything in step 1 here)
- Take a
client_secretand put it into the config as value ofclientSecretproperty.
# run pwmetrics with config in package.json
pwmetrics --submit# run pwmetrics with config in pwmetrics-config.js
pwmetrics --submit --config=pwmetrics-config.jspwmetrics-config.js
module.exports = {
'url': 'http://example.com/',
'sheets': {
...
},
'clientSecret': {
...
}
}Upload Lighthouse traces to Google Drive
Instructions:
- Setup Google Developer project and get credentials. (everything in step 1 here)
- Take a
client_secretand put it into the config as value ofclientSecretproperty.
# run pwmetrics with config in package.json
pwmetrics --upload# run pwmetrics with config in pwmetrics-config.js
pwmetrics --upload --config=pwmetrics-config.jspwmetrics-config.js
module.exports = {
'url': 'http://example.com/',
'clientSecret': {
...
}
}Show Lighthouse traces in timeline-viewer.
Required to use
uploadflag
timeline-viewer - Shareable URLs for your Chrome DevTools Timeline traces.
# run pwmetrics with config in package.json
pwmetrics --upload --view# run pwmetrics with config in your-own-file.js
pwmetrics --upload --view --config=your-own-file.jspwmetrics-config.js
module.exports = {
'url': 'http://example.com/',
'clientSecret': {
...
}
}ttfcp- First Contentful Paintttfmp- First Meaningful Paintpsi- Perceptual Speed Indexfv- First Visual Changevc- Visually Complete 100%ttfi- First Interactive (vBeta)ttci- Time to Consistently Interactive (vBeta)vc85- Visually Complete 85%
Read article Performance metrics. What’s this all about? which is decoding this metrics.
const PWMetrics = require('pwmetrics');
const options = {
flags: {
runs: '3', // number or runs
submit: true, // turn on submitting to Google Sheets
upload: true, // turn on uploading to Google Drive
view: true, // open uploaded traces to Google Drive in DevTools
expectations: true // turn on assertation metrics results against provides values
chromeFlags: [
'--headless' // run in headless Chrome
]
}
};
const pwMetrics = new PWMetrics('http://example.com/', options); // _All available configuration options_ can be used as `options`
pwMetrics.start(); // returns Promise| Option | Type | Default | Description |
|---|---|---|---|
| flags* | Object |
{
runs: 1,
submit: false,
upload: false,
view: false,
expectations: false,
disableCpuThrottling: false,
chromeFlags: []
}
|
Feature flags |
| expectations | Object | {} | See Defining expectations above. |
| sheets | Object | {} | See Defining submit above. |
| clientSecret | Object | {} | Client secrete data generated by Google API console. To setup Google Developer project and get credentials apply everything in step 1 here. |
*pwmetrics supports all flags from Lighthouse. See here for the complete list.
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