diff --git a/types/twitch-ext/index.d.ts b/types/twitch-ext/index.d.ts
index 4cac514539..6c3126c049 100644
--- a/types/twitch-ext/index.d.ts
+++ b/types/twitch-ext/index.d.ts
@@ -1,6 +1,7 @@
-// Type definitions for non-npm package twitch-ext 1.15
+// Type definitions for non-npm package twitch-ext 1.20
 // Project: https://dev.twitch.tv/docs/extensions/reference/#javascript-helper
 // Definitions by: Benedict Etzel <https://github.com/beheh>
+//                 Federico Della Rovere <https://github.com/FedeDR>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
 // TypeScript Version: 2.4
 
@@ -29,6 +30,11 @@ interface TwitchExt {
 	 */
 	actions: TwitchExtActions;
 
+	/**
+	 * @see https://dev.twitch.tv/docs/extensions/reference/#helper-configuration
+	 */
+	configuration: TwitchExtConfiguration;
+
 	/**
 	 * @see https://dev.twitch.tv/docs/extensions/reference/#twitch-extension-feature-flags
 	 */
@@ -170,6 +176,44 @@ interface TwitchExtActions {
 	requestIdShare(): void;
 }
 
+/**
+ * @see TwitchExt.configuration
+ */
+interface TwitchExtConfiguration {
+	/**
+	 * This property returns the record for the broadcaster segment if one is found; otherwise, undefined.
+	 */
+	broadcaster?: { version: string; content: string };
+
+	/**
+	 * This property returns the record for the developer segment if one is found; otherwise, undefined.
+	 */
+	developer?: { version: string; content: string };
+
+	/**
+	 * This property returns the record for the global segment if one is found; otherwise, undefined.
+	 */
+	global?: { version: string; content: string };
+
+	/**
+	 * This function registers a callback that is called whenever an extension configuration is received.
+	 * The callback function takes no input and returns nothing. After this is called for the first time,
+	 * the records for the global, developer and broadcaster segments will be set if the data is available.
+	 * @param callback The callback that is fired.
+	 */
+	onChanged(
+		callback: () => void
+	): void;
+
+	/**
+	 * This function can be called by the front end to set an extension configuration.
+	 * @param segment The configuration segment to set. Valid value. "broadcaster".
+	 * @param version The version of configuration with which the segment is stored.
+	 * @param content The string-encoded configuration.
+	 */
+	set(segment: "broadcaster", version: string, content: string): void;
+}
+
 interface TwitchExtFeatureFlags {
 	/**
 	 * If this flag is true, you can send a chat message to the current channel using Send Extension Chat Message
diff --git a/types/twitch-ext/twitch-ext-tests.ts b/types/twitch-ext/twitch-ext-tests.ts
index f6a70f86cb..f3b16517d2 100644
--- a/types/twitch-ext/twitch-ext-tests.ts
+++ b/types/twitch-ext/twitch-ext-tests.ts
@@ -36,6 +36,28 @@ window.Twitch.ext.actions.minimize();
 window.Twitch.ext.actions.followChannel("hearthsim");
 window.Twitch.ext.actions.requestIdShare();
 
+// Twitch Extension Configuration
+window.Twitch.ext.configuration.onChanged(() => {
+	console.log('Configuration changed');
+	if (window.Twitch.ext.configuration.broadcaster) {
+		console.log('Caster configuration');
+		console.log('version: ', window.Twitch.ext.configuration.broadcaster.version);
+		console.log('content: ', window.Twitch.ext.configuration.broadcaster.content);
+	}
+	if (window.Twitch.ext.configuration.developer) {
+		console.log('Developer configuration');
+		console.log('version:', window.Twitch.ext.configuration.developer.version);
+		console.log('content: ', window.Twitch.ext.configuration.developer.content);
+	}
+	if (window.Twitch.ext.configuration.global) {
+		console.log('Global configuration');
+		console.log('version: ', window.Twitch.ext.configuration.global.version);
+		console.log('content: ', window.Twitch.ext.configuration.global.content);
+	}
+});
+
+window.Twitch.ext.configuration.set('broadcaster', '0.0.1', '{"test": "test"}');
+
 // Twitch Extension Feature flags
 window.Twitch.ext.features.onChanged(changed => {
 	if (changed.indexOf("isChatEnabled") !== -1) {