Set up Node.js (client-side) SDK

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import * as LaunchDarkly from 'launchdarkly-node-client-sdk';
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// A "context" is a data object representing users, devices, organizations, and other entities.
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const context = {
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  kind: 'user',
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  key: 'EXAMPLE_CONTEXT_KEY',
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};
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// This is your client-side ID.
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const client = LaunchDarkly.initialize('YOUR_CLIENT_SIDE_ID', context);
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try {
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  await client.waitForInitialization(5);
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  // Initialization succeeded
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} catch (err) {
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  // Initialization failed or did not complete before timeout
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}