Improve typing

Signed-off-by: Andrei Floricel <andrei.floricel@gmail.com>

Author: andreifloricel

src/api/DesktopAgent.ts

@@ -14,6 +14,7 @@ import { PrivateChannel } from './PrivateChannel';
 import { AppIdentifier } from './AppIdentifier';
 import { AppMetadata } from './AppMetadata';
 import { Intent } from '../intents/Intents';
+import { ContextType } from '../context/ContextType';
 
 /**
  * A Desktop Agent is a desktop component (or aggregate of components) that serves as a
@@ -372,7 +373,7 @@ export interface DesktopAgent {
    * });
    * ```
    */
-  addContextListener(contextType: string | null, handler: ContextHandler): Promise<Listener>;
+  addContextListener(contextType: ContextType | null, handler: ContextHandler): Promise<Listener>;
 
   /**
    * Retrieves a list of the User channels available for the app to join.

src/api/Methods.ts

@@ -18,6 +18,7 @@ import {
   StandardContextType,
   StandardIntent,
   ContextTypeFor,
+  ContextType,
 } from '..';
 import { IntentsConfiguration, StandardContextsSet, StandardIntentsSet } from '../intents/IntentsConfiguration';
 
@@ -112,7 +113,7 @@ export function addIntentListener(intent: Intent, handler: IntentHandler): Promi
 }
 
 export function addContextListener(
-  contextTypeOrHandler: string | null | ContextHandler,
+  contextTypeOrHandler: ContextType | null | ContextHandler,
   handler?: ContextHandler
 ): Promise<Listener> {
   //Handle (deprecated) function signature that allowed contextType argument to be omitted
@@ -187,15 +188,15 @@ export function findInstances(app: AppIdentifier): Promise<AppIdentifier[]> {
  * Check if the given context is a standard context type.
  * @param contextType
  */
-export function isStandardContextType(contextType: string): contextType is StandardContextType {
+export function isStandardContextType(contextType: ContextType): contextType is StandardContextType {
   return StandardContextsSet.has(contextType as StandardContextType);
 }
 
 /**
  * Check if the given intent is a standard intent.
  * @param intent
  */
-export function isStandardIntent(intent: string): intent is StandardIntent {
+export function isStandardIntent(intent: Intent): intent is StandardIntent {
   return StandardIntentsSet.has(intent as StandardIntent);
 }