Added SF context object docs

lib/lambda-bases/lambda.js

@@ -7,6 +7,13 @@ const lodashPick = require('lodash/pick');
 const NANOID_LENGTH = 10;
 const nanoid = customAlphabet('ABCDEFGHIJKLMNOPQRSTUVWXYZ123456789', NANOID_LENGTH);
 
+/**
+ * @typedef {object} StepFunctionContext
+ * @property {string} EnteredTime ISO 8601 Date string
+ * @property {string} Name The name of the State Machine
+ * @property {number} RetryCount The current number of retry attempts of a task
+ */
+
 module.exports = class Lambda {
 
 	/**
@@ -40,30 +47,30 @@ module.exports = class Lambda {
 	}
 
 	/**
-	 * @param {*} taskToken The task token. Only present for async invoked tasks of state machines
+	 * @param {string?} [] The task token. Only present for async invoked tasks of state machines
 	 */
 	set taskToken(taskToken) {
 		/** @private */
 		this._taskToken = taskToken;
 	}
 
 	/**
-	 * @returns {*} The task token. Only present for async invoked tasks of state machines
+	 * @returns {string?} The task token. Only present for async invoked tasks of state machines
 	 */
 	get taskToken() {
 		return this._taskToken;
 	}
 
 	/**
-	 * @param {*} state The invocation state. Only present for async invoked tasks of state machines
+	 * @param {StepFunctionContext?} state The invocation state. Only present for async invoked tasks of state machines
 	 */
 	set state(state) {
 		/** @private */
 		this._state = state;
 	}
 
 	/**
-	 *  @returns {*} The invocation state. Only present for async invoked tasks of state machines
+	 *  @returns {StepFunctionContext?} The invocation state. Only present for async invoked tasks of state machines
 	*/
 	get state() {
 		return this._state;