Usage Examples

Flagship supports multiple programming languages and frameworks through OpenFeature. Here are some examples of how to implement feature flags.

Typescript

const client = OpenFeature.getClient();

// The AI detects this new key 'new-checkout-flow' in your PR
// Flagship automatically creates the flag if it doesn't exist
const isNewCheckoutEnabled = await client.getBooleanValue('new-checkout-flow', false, { 
    targetingKey: user.id, // Critical for percentage rollouts!
    // Add other context attributes for targeting rules
    email: user.email,
    plan: user.plan
});

if (isNewCheckoutEnabled) {
  return renderNewCheckout();
} else {
  return renderLegacyCheckout();
}

Python

client = api.get_client()

# The AI detects this new key 'new-checkout-flow' in your PR
# Ensure you provide a targeting_key for deterministic rollouts
is_new_checkout_enabled = client.get_boolean_value(
    "new-checkout-flow", 
    False, 
    EvaluationContext(
        targeting_key=user.id,
        attributes={
            "email": user.email,
            "plan": user.plan
        }
    )
)

if is_new_checkout_enabled:
    return render_new_checkout()
else:
    return render_legacy_checkout()

Go

client := openfeature.NewClient("app")

// The AI detects this new key 'new-checkout-flow' in your PR
evalCtx := openfeature.NewEvaluationContext(
    user.ID, // This is mapped to targetingKey
    map[string]interface{}{
        "email": user.Email,
        "plan":  user.Plan,
    },
)

isNewCheckoutEnabled, _ := client.BooleanValue(
    context.Background(), 
    "new-checkout-flow", 
    false, 
    evalCtx,
)

if isNewCheckoutEnabled {
    return renderNewCheckout()
} else {
    return renderLegacyCheckout()
}

Java

Client client = OpenFeatureAPI.getInstance().getClient();

// The AI detects this new key 'new-checkout-flow' in your PR
// The constructor argument is the targetingKey
MutableContext context = new MutableContext(user.getId());
context.add("email", user.getEmail());
context.add("plan", user.getPlan());

Boolean isNewCheckoutEnabled = client.getBooleanValue("new-checkout-flow", false, context);

if (isNewCheckoutEnabled) {
    return renderNewCheckout();
} else {
    return renderLegacyCheckout();
}