From 59a33a7bc5ba163d90f723c642e2715905c768dc Mon Sep 17 00:00:00 2001
From: Aric Camarata <aric.camarata@gmail.com>
Date: Tue, 30 Jun 2026 15:00:14 -0400
Subject: [PATCH] add opt-in telemetry via @acamarata/telemetry (off by
 default)

---
 README.md    |  5 +++++
 TELEMETRY.md |  8 ++++++++
 package.json |  3 ++-
 src/index.ts | 11 +++++++++++
 4 files changed, 26 insertions(+), 1 deletion(-)
 create mode 100644 TELEMETRY.md

diff --git a/README.md b/README.md
index ebf9048..2b622cc 100644
--- a/README.md
+++ b/README.md
@@ -73,6 +73,11 @@ day-start determination is out of scope.
 - [luxon-hijri](https://github.com/acamarata/luxon-hijri): Hijri support for Luxon
 - [pray-calc](https://github.com/acamarata/pray-calc): Islamic prayer times
 
+## Telemetry
+
+This package supports opt-in anonymous usage telemetry — off by default.
+Enable: `ACAMARATA_TELEMETRY=1`. See [TELEMETRY.md](./TELEMETRY.md) for what is sent and how to disable.
+
 ## License
 
 MIT. Copyright (c) 2026 Aric Camarata. See [LICENSE](LICENSE).
diff --git a/TELEMETRY.md b/TELEMETRY.md
new file mode 100644
index 0000000..99cfaa4
--- /dev/null
+++ b/TELEMETRY.md
@@ -0,0 +1,8 @@
+# Telemetry Disclosure
+
+This package supports opt-in anonymous usage telemetry via [`@acamarata/telemetry`](https://github.com/acamarata/telemetry).
+
+Telemetry is **off by default**. No data is sent unless you set `ACAMARATA_TELEMETRY=1`.
+
+Full disclosure (what is sent, where it goes, how to disable):
+[github.com/acamarata/telemetry/blob/main/TELEMETRY.md](https://github.com/acamarata/telemetry/blob/main/TELEMETRY.md)
diff --git a/package.json b/package.json
index b738d59..28ef372 100644
--- a/package.json
+++ b/package.json
@@ -81,7 +81,8 @@
     "typedoc": "^0.28.19",
     "typedoc-plugin-markdown": "^4.11.0",
     "typescript": "^5.5.0",
-    "typescript-eslint": "^8.56.1"
+    "typescript-eslint": "^8.56.1",
+    "@acamarata/telemetry": "^0.1.0"
   },
   "publishConfig": {
     "access": "public",
diff --git a/src/index.ts b/src/index.ts
index 58017bf..4b64d35 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -10,3 +10,14 @@ import { FcnaCalendar } from "./calendars/FcnaCalendar";
 
 export const uaqCalendar = new UaqCalendar();
 export const fcnaCalendar = new FcnaCalendar();
+
+// ── Opt-in anonymous telemetry ────────────────────────────────────────────────
+// Off by default. Enable: ACAMARATA_TELEMETRY=1
+// What is sent + how to disable: https://github.com/acamarata/telemetry/blob/main/TELEMETRY.md
+import('@acamarata/telemetry')
+  .then(({ track }) =>
+    track('load', { package: 'temporal-hijri', version: '1.0.3' }),
+  )
+  .catch(() => {
+    // telemetry not installed or disabled — that is fine
+  });