add ContextToken

src/Umbraco.Web.UI.Client/src/core/context-api/context-token.ts

@@ -0,0 +1,19 @@
+export class ContextToken<T> {
+	/**
+	 * @param _desc   Description for the token,
+	 *                used only for debugging purposes,
+	 *                it should but does not need to be unique
+	 */
+	constructor(protected _desc: string) {}
+
+	/**
+	 * @internal
+	 */
+	get multi(): ContextToken<Array<T>> {
+		return this as ContextToken<Array<T>>;
+	}
+
+	toString(): string {
+		return `${ContextToken.name} ${this._desc}`;
+	}
+}

src/Umbraco.Web.UI.Client/src/core/context-api/index.ts

@@ -2,3 +2,4 @@ export * from './consume/context-consumer';
 export * from './consume/context-request.event';
 export * from './provide/context-provider';
 export * from './provide/context-provide.event';
+export * from './context-token';