From 9970036d203ba2d0a46b35ba6fad21d49441cdd4 Mon Sep 17 00:00:00 2001
From: Elizabeth Hunt <me@liz.coffee>
Date: Sun, 27 Jul 2025 17:03:10 -0700
Subject: hai

---
 lib/trace/metric/index.ts | 41 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 41 insertions(+)
 create mode 100644 lib/trace/metric/index.ts

(limited to 'lib/trace/metric/index.ts')

diff --git a/lib/trace/metric/index.ts b/lib/trace/metric/index.ts
new file mode 100644
index 0000000..aebc890
--- /dev/null
+++ b/lib/trace/metric/index.ts
@@ -0,0 +1,41 @@
+import { isTagged, Tagged, type Mapper } from '@emprespresso/pengueno';
+
+export enum Unit {
+    COUNT = 'COUNT',
+    MILLISECONDS = 'MILLISECONDS',
+}
+
+export const MetricValueTag = 'MetricValue' as const;
+export type MetricValueTag = typeof MetricValueTag;
+export const isMetricValue = (t: unknown): t is MetricValue => isTagged(t, MetricValueTag);
+export interface MetricValue extends Tagged<MetricValueTag> {
+    readonly name: string;
+    readonly unit: Unit;
+    readonly value: number;
+    readonly emissionTimestamp: number;
+}
+
+export interface IEmittableMetric {
+    readonly name: string;
+    readonly unit: Unit;
+    readonly withValue: Mapper<number, MetricValue>;
+}
+
+export const IMetricTag = 'IMetric' as const;
+export type IMetricTag = typeof IMetricTag;
+export const isIMetric = (t: unknown): t is IMetric => isTagged(t, IMetricTag);
+export interface IMetric extends Tagged<IMetricTag> {
+    readonly count: IEmittableMetric;
+    readonly time: IEmittableMetric;
+    readonly parent: undefined | IMetric;
+}
+
+export interface IResultMetric extends IMetric {
+    readonly failure: IMetric;
+    readonly success: IMetric;
+    readonly warn: IMetric;
+}
+
+export * from './emittable';
+export * from './metric';
+export * from './trace';
-- 
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