How to use the puppeteer-core._launcher function in puppeteer-core
To help you get started, we’ve selected a few puppeteer-core examples, based on popular ways it is used in public projects.
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Munter / subfont / lib / HeadlessBrowser.js View on Github 
async function downloadOrLocatePreferredBrowserRevision() {
const browserFetcher = puppeteer.createBrowserFetcher();
const preferredRevision = puppeteer._launcher._preferredRevision;
const localRevisions = await browserFetcher.localRevisions();
let revisionInfo;
if (localRevisions.includes(preferredRevision)) {
revisionInfo = await browserFetcher.revisionInfo(preferredRevision);
} else {
console.log(`Downloading Chromium ${preferredRevision}`);
revisionInfo = await browserFetcher.download(preferredRevision);
}
return puppeteer.launch({
executablePath: revisionInfo.executablePath
});
}puppeteer-core
A high-level API to control headless Chrome over the DevTools Protocol
