From adc745feb9005add119f5b35b9dfee3d392758da Mon Sep 17 00:00:00 2001
From: typotter <tyler.potter@datadoghq.com>
Date: Mon, 27 Apr 2026 09:50:55 -0600
Subject: [PATCH 1/2] feat(core): expose createFlagEvaluationEndpointBuilder as
 public API

External packages like @datadog/openfeature-browser need to build intake
endpoint URLs for the flagevaluation track. Rather than exporting the
generic createEndpointBuilder (which leaks TrackType), expose a
purpose-specific wrapper so callers have a stable, narrowly-scoped API.
---
 .../src/domain/configuration/endpointBuilder.ts  | 16 ++++++++++++++++
 packages/core/src/domain/configuration/index.ts  |  2 +-
 packages/core/src/index.ts                       |  1 +
 3 files changed, 18 insertions(+), 1 deletion(-)

diff --git a/packages/core/src/domain/configuration/endpointBuilder.ts b/packages/core/src/domain/configuration/endpointBuilder.ts
index 78754b6fa5..1962e52f1f 100644
--- a/packages/core/src/domain/configuration/endpointBuilder.ts
+++ b/packages/core/src/domain/configuration/endpointBuilder.ts
@@ -8,6 +8,10 @@ import type { InitConfiguration } from './configuration'
 // replaced at build time
 declare const __BUILD_ENV__SDK_VERSION__: string
 
+// Note: 'flagevaluation' is intentionally not wired into TransportConfiguration or computeEndpointBuilders.
+// It is used by external SDK packages (e.g. @datadog/openfeature-browser) via the public
+// createFlagEvaluationEndpointBuilder function. Adding it here makes the intake path
+// (/api/v2/flagevaluation) an explicit part of the contract.
 export type TrackType = 'logs' | 'rum' | 'replay' | 'profile' | 'exposures' | 'flagevaluation'
 export type ApiType =
   | 'fetch'
@@ -56,6 +60,18 @@ function createEndpointUrlWithParametersBuilder(
   return (parameters) => `https://${host}${path}?${parameters}`
 }
 
+/**
+ * Build an EndpointBuilder for the flagevaluation intake track. Intended for use by external SDK
+ * packages (e.g. @datadog/openfeature-browser) that need to send flag evaluation data to the
+ * Datadog intake without depending on internal browser-core APIs.
+ */
+export function createFlagEvaluationEndpointBuilder(
+  initConfiguration: InitConfiguration,
+  extraParameters?: string[]
+) {
+  return createEndpointBuilder(initConfiguration, 'flagevaluation', extraParameters)
+}
+
 export function buildEndpointHost(
   trackType: TrackType,
   initConfiguration: InitConfiguration & { usePciIntake?: boolean }
diff --git a/packages/core/src/domain/configuration/index.ts b/packages/core/src/domain/configuration/index.ts
index 30a5b6fe92..d510295616 100644
--- a/packages/core/src/domain/configuration/index.ts
+++ b/packages/core/src/domain/configuration/index.ts
@@ -7,5 +7,5 @@ export {
   serializeConfiguration,
 } from './configuration'
 export type { EndpointBuilder, TrackType } from './endpointBuilder'
-export { createEndpointBuilder, buildEndpointHost } from './endpointBuilder'
+export { createEndpointBuilder, buildEndpointHost, createFlagEvaluationEndpointBuilder } from './endpointBuilder'
 export { computeTransportConfiguration, isIntakeUrl } from './transportConfiguration'
diff --git a/packages/core/src/index.ts b/packages/core/src/index.ts
index a976c60832..3f48685635 100644
--- a/packages/core/src/index.ts
+++ b/packages/core/src/index.ts
@@ -7,6 +7,7 @@ export {
   isSampleRate,
   buildEndpointHost,
   isIntakeUrl,
+  createFlagEvaluationEndpointBuilder,
 } from './domain/configuration'
 export * from './domain/intakeSites'
 export type { TrackingConsentState } from './domain/trackingConsent'

From 4a5b38615f90718be06f18fff4439ef6a5027a3d Mon Sep 17 00:00:00 2001
From: typotter <tyler.potter@datadoghq.com>
Date: Mon, 27 Apr 2026 12:43:06 -0600
Subject: [PATCH 2/2] style: fix prettier formatting for
 createFlagEvaluationEndpointBuilder

---
 packages/core/src/domain/configuration/endpointBuilder.ts | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/packages/core/src/domain/configuration/endpointBuilder.ts b/packages/core/src/domain/configuration/endpointBuilder.ts
index 1962e52f1f..ea5b888909 100644
--- a/packages/core/src/domain/configuration/endpointBuilder.ts
+++ b/packages/core/src/domain/configuration/endpointBuilder.ts
@@ -65,10 +65,7 @@ function createEndpointUrlWithParametersBuilder(
  * packages (e.g. @datadog/openfeature-browser) that need to send flag evaluation data to the
  * Datadog intake without depending on internal browser-core APIs.
  */
-export function createFlagEvaluationEndpointBuilder(
-  initConfiguration: InitConfiguration,
-  extraParameters?: string[]
-) {
+export function createFlagEvaluationEndpointBuilder(initConfiguration: InitConfiguration, extraParameters?: string[]) {
   return createEndpointBuilder(initConfiguration, 'flagevaluation', extraParameters)
 }