Merge branch 'master' into fix-setting-content-type

CHANGELOG.md

@@ -11,6 +11,7 @@ project adheres to [Semantic Versioning](http://semver.org/).
 
 ### Changed
 
+- Add `Registry.PROMETHEUS_CONTENT_TYPE` and `Registry.OPENMETRICS_CONTENT_TYPE` constants to the TypeScript types
 - Correctly read and set `contentType` top level export
 
 ### Added

index.d.ts

@@ -95,6 +95,16 @@ export class Registry<RegistryContentType = PrometheusContentType> {
 	 * @param registers The registers you want to merge together
 	 */
 	static merge(registers: Registry[]): Registry;
+
+	/**
+	 * HTTP Prometheus Content-Type for metrics response headers.
+	 */
+	static PROMETHEUS_CONTENT_TYPE: PrometheusContentType;
+
+	/**
+	 * HTTP OpenMetrics Content-Type for metrics response headers.
+	 */
+	static OPENMETRICS_CONTENT_TYPE: OpenMetricsContentType;
 }
 export type Collector = () => void;