--- /dev/null
+/**
+ * Helpers for constructing routing headers.
+ *
+ * These headers are used by Google infrastructure to determine how to route
+ * requests, especially for services that are regional.
+ *
+ * Generally, these headers are specified as gRPC metadata.
+ */
+/**
+ * Constructs the routing header from the given params
+ *
+ * @param {Object} params - the request header parameters.
+ * @return {string} the routing header value.
+ */
+export declare function fromParams(params: {
+ [index: string]: {};
+}): string;