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How Are Impressions Generated?

Impressions are automatically logged each time a flag is evaluated with the flag function, capturing the variant served to the user.

client.flag<T>(flagKey: string, defaultValue?: T);

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Example

For a flag like signup-cta with variants Join Now, Register, Sign Up:

const value = client.flag('signup-cta', 'Register');
console.log(`signup-cta is ${value}`);

If User ABC is shown Join Now, an impression is logged “User ABC saw Join Now for signup-cta.”

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Next Steps