Set up Node.js (server-side) SDK

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import * as LaunchDarkly from '@launchdarkly/node-server-sdk';
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// Set your LaunchDarkly SDK key.
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// This is inlined as example only for onboarding.
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// Never hardcode your SDK key in production.
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const client = LaunchDarkly.init('YOUR_SDK_KEY');
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client.once('ready', function () {
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  // For onboarding purposes only we flush events as soon as
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  // possible so we quickly detect your connection.
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  // You don't have to do this in practice because events are automatically flushed.
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  client.flush();
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  console.log('SDK successfully initialized!');
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});