feat(checkout): CHECKOUT-4223 Add CheckoutSupport interface, to be …

…implemented by classes used to check if feature is supported by certain type of checkout

src/app/checkout/CheckoutSupport.ts

@@ -0,0 +1,10 @@
+export default interface CheckoutSupport {
+    /**
+     * Check if a feature is supported.
+     *
+     * If a feature is not supported, the call will throw an error.
+     * Otherwise, it will return true. It will always return true if the
+     * application is not running as Embedded Checkout.
+     */
+    isSupported(...ids: string[]): boolean;
+}

src/app/checkout/NoopCheckoutSupport.ts

@@ -0,0 +1,7 @@
+import CheckoutSupport from './CheckoutSupport';
+
+export default class NoopCheckoutSupport implements CheckoutSupport {
+    isSupported(): boolean {
+        return true;
+    }
+}

src/app/checkout/index.ts

@@ -1,10 +1,13 @@
 import { CheckoutContextProps } from './CheckoutContext';
 import { CheckoutProviderProps, CheckoutProviderState } from './CheckoutProvider';
+import CheckoutSupport from './CheckoutSupport';
 
 export type CheckoutContextProps = CheckoutContextProps;
 export type CheckoutProviderProps = CheckoutProviderProps;
 export type CheckoutProviderState = CheckoutProviderState;
+export type CheckoutSupport = CheckoutSupport;
 
 export { default as CheckoutContext } from './CheckoutContext';
 export { default as CheckoutProvider } from './CheckoutProvider';
 export { default as withCheckout } from './withCheckout';
+export { default as NoopCheckoutSupport } from './NoopCheckoutSupport';