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feat: add warm-up script function to fetch resources before injection #99

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feat: add warm-up script function to fetch resources before injection #99

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16 changes: 15 additions & 1 deletion packages/web/src/generic.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -3,6 +3,18 @@ import { initQueue } from './queue';
import type { SpeedInsightsProps, BeforeSendMiddleware } from './types';
import { computeRoute, getScriptSrc, isBrowser, isDevelopment } from './utils';

/**
* Triggers a fetch call to the specified URL to warm up the endpoint.
* Any errors are silently ignored.
*/
async function warmUpScript(src: string): Promise<void> {
try {
await fetch(src);
} catch (err) {
void 0; // no-op to satisfy non-empty block rules
}
}

/**
* Injects the Vercel Speed Insights script into the page head and starts tracking page views. Read more in our [documentation](https://vercel.com/docs/speed-insights).
* @param [props] - Speed Insights options.
Expand Down Expand Up @@ -65,7 +77,9 @@ function injectSpeedInsights(
);
};

document.head.appendChild(script);
void warmUpScript(src).finally(() => {
document.head.appendChild(script);
});

return {
setRoute: (route: string | null): void => {
Expand Down