Invoking ChatSession.getTranscript() without arguments fails even though all arguments are optional

[marcogrcr]

ChatSession.getTranscript() must always be invoked with an Object argument, even though all arguments are optional:

const session = connect.ChatSession.create({ /* (...) */});

// specifying an empty object (i.e. `{}`) is required, even though all arguments are optional
const transcript = await session.getTranscript({});

Ideally, this method should be allowed to be invoked without any arguments to achieve the same purpose:

const session = connect.ChatSession.create({ /* (...) */});

// this should be allowed, yet this is thrown instead:
// Uncaught TypeError: Cannot read properties of undefined (reading 'metadata')
const transcript = await session.getTranscript();

This happens because the inputArgs parameter of ChatController.prototype.getTranscript() is used without any validation:

amazon-connect-chatjs/src/core/chatController.js

Lines 165 to 167 in d85c517

	getTranscript(inputArgs) {
	const startTime = new Date().getTime();
	const metadata = inputArgs.metadata || null;

Proposed fix:

Update ChatController.prototype.getTranscript() to make inputArgs optional with {} as the default value:

getTranscript(inputArgs = {}) {
  // (...)
}