Initial Commit

packages/testkit/testing/ab-testing/src/constants/index.ts

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+/** Default sample rate — include 100% of eligible users in the experiment. */
+export const DEFAULT_SAMPLE_RATE = 1.0;
+
+/** Default FNV-1a seed offset XOR'd into the hash basis when no custom seed is provided. */
+export const DEFAULT_HASH_SEED = 0;
+
+/** FNV-1a 32-bit offset basis. */
+export const FNV_OFFSET_BASIS = 2166136261;
+
+/** FNV-1a 32-bit prime. */
+export const FNV_PRIME = 16777619;
+
+/** Maximum allowed total weight for variants (normalisation denominator). */
+export const MAX_VARIANT_WEIGHT = Number.MAX_SAFE_INTEGER;
+
+/** Event bus topic emitted when a user is assigned to an experiment variant. */
+export const EVENT_AB_ASSIGNED = "ab:assigned";
+
+/** Event bus topic emitted when a conversion event is tracked. */
+export const EVENT_AB_CONVERSION = "ab:conversion";
+
+/** OTel meter name for all A/B testing instruments. */
+export const OTEL_METER_NAME = "@suaveplan/ab-testing";
+
+/** OTel span name for the assign operation. */
+export const OTEL_SPAN_ASSIGN = "ab.assign";
+
+/** OTel counter name tracking total variant assignments. */
+export const OTEL_COUNTER_ASSIGNMENTS = "ab.assignments_total";
+
+/** OTel counter name tracking total conversion events. */
+export const OTEL_COUNTER_CONVERSIONS = "ab.conversions_total";