--- /dev/null
+/// <reference types="node" />
+import * as http2 from 'http2';
+export declare type MetadataValue = string | Buffer;
+export declare type MetadataObject = Map<string, MetadataValue[]>;
+/**
+ * A class for storing metadata. Keys are normalized to lowercase ASCII.
+ */
+export declare class Metadata {
+ protected internalRepr: MetadataObject;
+ /**
+ * Sets the given value for the given key by replacing any other values
+ * associated with that key. Normalizes the key.
+ * @param key The key to whose value should be set.
+ * @param value The value to set. Must be a buffer if and only
+ * if the normalized key ends with '-bin'.
+ */
+ set(key: string, value: MetadataValue): void;
+ /**
+ * Adds the given value for the given key by appending to a list of previous
+ * values associated with that key. Normalizes the key.
+ * @param key The key for which a new value should be appended.
+ * @param value The value to add. Must be a buffer if and only
+ * if the normalized key ends with '-bin'.
+ */
+ add(key: string, value: MetadataValue): void;
+ /**
+ * Removes the given key and any associated values. Normalizes the key.
+ * @param key The key whose values should be removed.
+ */
+ remove(key: string): void;
+ /**
+ * Gets a list of all values associated with the key. Normalizes the key.
+ * @param key The key whose value should be retrieved.
+ * @return A list of values associated with the given key.
+ */
+ get(key: string): MetadataValue[];
+ /**
+ * Gets a plain object mapping each key to the first value associated with it.
+ * This reflects the most common way that people will want to see metadata.
+ * @return A key/value mapping of the metadata.
+ */
+ getMap(): {
+ [key: string]: MetadataValue;
+ };
+ /**
+ * Clones the metadata object.
+ * @return The newly cloned object.
+ */
+ clone(): Metadata;
+ /**
+ * Merges all key-value pairs from a given Metadata object into this one.
+ * If both this object and the given object have values in the same key,
+ * values from the other Metadata object will be appended to this object's
+ * values.
+ * @param other A Metadata object.
+ */
+ merge(other: Metadata): void;
+ /**
+ * Creates an OutgoingHttpHeaders object that can be used with the http2 API.
+ */
+ toHttp2Headers(): http2.OutgoingHttpHeaders;
+ private _getCoreRepresentation;
+ /**
+ * Returns a new Metadata object based fields in a given IncomingHttpHeaders
+ * object.
+ * @param headers An IncomingHttpHeaders object.
+ */
+ static fromHttp2Headers(headers: http2.IncomingHttpHeaders): Metadata;
+}