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webvitals.ts
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import type { Metric } from 'web-vitals';
import { getCLS, getFCP, getFID, getLCP, getTTFB } from 'web-vitals';
export type AnalyticsOptions = {
params: Record<string, string>;
path: string;
analyticsId: string;
debug?: true;
};
const vitalsUrl = 'https://vitals.vercel-analytics.com/v1/vitals';
function getConnectionSpeed(): string {
return 'connection' in navigator &&
navigator['connection'] &&
'effectiveType' in navigator['connection']
? navigator['connection']['effectiveType']
: '';
}
function sendToAnalytics(metric: Metric, options: AnalyticsOptions) {
const page = Object.entries(options.params).reduce(
(acc, [key, value]) => acc.replace(value, `[${key}]`),
options.path
);
const body = {
dsn: options.analyticsId,
id: metric.id,
page,
href: location.href,
event_name: metric.name,
value: metric.value.toString(),
speed: getConnectionSpeed()
};
if (options.debug) {
console.log('[Analytics]', metric.name, JSON.stringify(body, null, 2));
}
const blob = new Blob([new URLSearchParams(body).toString()], {
// This content type is necessary for `sendBeacon`:
type: 'application/x-www-form-urlencoded'
});
if (navigator.sendBeacon) {
navigator.sendBeacon(vitalsUrl, blob);
} else
fetch(vitalsUrl, {
body: blob,
method: 'POST',
credentials: 'omit',
keepalive: true
});
}
export function webVitals(options: AnalyticsOptions): void {
try {
getFID((metric) => sendToAnalytics(metric, options));
getTTFB((metric) => sendToAnalytics(metric, options));
getLCP((metric) => sendToAnalytics(metric, options));
getCLS((metric) => sendToAnalytics(metric, options));
getFCP((metric) => sendToAnalytics(metric, options));
} catch (err) {
console.error('[Analytics]', err);
}
}