Overview

If not, the SDK returns the defaultValue (e.g., false) or control string.

// Before SDK is ready

const one = client.flag('flag-one', false); // false (defaultValue)

const two = client.flag('flag-two'); // "control"

await client.waitForReady();

If the flag key isn’t found, the SDK returns the defaultValue or control.

// Unknown flag, returns true (defaultValue)

const value = client.flag('foobarbaz', true);

• If disabled: The default “off” variant is returned, halting further evaluation.
• If enabled: The algorithm proceeds to targeting and rollout checks.

• See Targeting for evaluation logic.
• See Flags: User Segments to learn about targeting rules.

• See Rollouts for evaluation logic.
• See Flags: Percentage Rollouts to learn about rollouts.

Returns the “on” variant if no rules or percentages apply.