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'use strict';
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const puppeteer = require('puppeteer');
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(async () => {
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       const browser = await puppeteer.launch();
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       try {
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           const page = await browser.newPage();
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           await page.goto('https://example.com');
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           const selector = 'body > div:first-child';
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           await page.waitForSelector(selector);
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           const element = await page.$(selector);
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           await element.screenshot({
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               path: 'example.com.png',
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           });
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       } catch (e) {
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           console.log(e)
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       } finally {
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           await browser.close();
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       }
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})();