Convert checkout state context provider to Typescript (woocommerce#4200)

* git move to ts files

* Type the checkout state provider

* Restore for loop for error handling

* Types not needed

* Consolodate response handling

* Unused import

* Fix defaults for onCheckoutAfterProcessingWithSuccess etc

* Type useEmitResponse and remove isObject checks

* useEmitResponse as const

* Check that redirectUrl is string

* Define actions as const

* data.redirectUrl should be truthy

* Add redirectURL todo item as followup

* remove null fallback

assets/js/base/context/hooks/use-emit-response.ts

@@ -0,0 +1,66 @@
+/**
+ * Internal dependencies
+ */
+import { isObject } from '../../utils/type-guards';
+
+export enum responseTypes {
+	SUCCESS = 'success',
+	FAIL = 'failure',
+	ERROR = 'error',
+}
+
+export enum noticeContexts {
+	PAYMENTS = 'wc/payment-area',
+	EXPRESS_PAYMENTS = 'wc/express-payment-area',
+}
+
+export interface ResponseType extends Record< string, unknown > {
+	type: responseTypes;
+	retry?: boolean;
+}
+
+const isResponseOf = (
+	response: unknown,
+	type: string
+): response is ResponseType => {
+	return isObject( response ) && 'type' in response && response.type === type;
+};
+
+export const isSuccessResponse = (
+	response: unknown
+): response is ResponseType => {
+	return isResponseOf( response, responseTypes.SUCCESS );
+};
+
+export const isErrorResponse = (
+	response: unknown
+): response is ResponseType => {
+	return isResponseOf( response, responseTypes.ERROR );
+};
+
+export const isFailResponse = (
+	response: unknown
+): response is ResponseType => {
+	return isResponseOf( response, responseTypes.FAIL );
+};
+
+export const shouldRetry = ( response: unknown ): boolean => {
+	return (
+		! isObject( response ) ||
+		typeof response.retry === 'undefined' ||
+		response.retry === true
+	);
+};
+
+/**
+ * A custom hook exposing response utilities for emitters.
+ */
+export const useEmitResponse = () =>
+	( {
+		responseTypes,
+		noticeContexts,
+		shouldRetry,
+		isSuccessResponse,
+		isErrorResponse,
+		isFailResponse,
+	} as const );

assets/js/base/context/providers/cart-checkout/checkout-state/actions.ts

@@ -0,0 +1,110 @@
+/**
+ * Internal dependencies
+ */
+import type { PaymentResultDataType } from './types';
+
+export enum ACTION {
+	SET_IDLE = 'set_idle',
+	SET_PRISTINE = 'set_pristine',
+	SET_REDIRECT_URL = 'set_redirect_url',
+	SET_COMPLETE = 'set_checkout_complete',
+	SET_BEFORE_PROCESSING = 'set_before_processing',
+	SET_AFTER_PROCESSING = 'set_after_processing',
+	SET_PROCESSING_RESPONSE = 'set_processing_response',
+	SET_PROCESSING = 'set_checkout_is_processing',
+	SET_HAS_ERROR = 'set_checkout_has_error',
+	SET_NO_ERROR = 'set_checkout_no_error',
+	SET_CUSTOMER_ID = 'set_checkout_customer_id',
+	SET_ORDER_ID = 'set_checkout_order_id',
+	SET_ORDER_NOTES = 'set_checkout_order_notes',
+	INCREMENT_CALCULATING = 'increment_calculating',
+	DECREMENT_CALCULATING = 'decrement_calculating',
+	SET_SHOULD_CREATE_ACCOUNT = 'set_should_create_account',
+}
+
+export interface ActionType {
+	type: ACTION;
+	data?:
+		| Record< string, unknown >
+		| Record< string, never >
+		| PaymentResultDataType;
+	url?: string;
+	customerId?: number;
+	orderId?: number;
+	shouldCreateAccount?: boolean;
+	hasError?: boolean;
+	orderNotes?: string;
+}
+
+/**
+ * All the actions that can be dispatched for the checkout.
+ */
+export const actions = {
+	setPristine: () =>
+		( {
+			type: ACTION.SET_PRISTINE,
+		} as const ),
+	setIdle: () =>
+		( {
+			type: ACTION.SET_IDLE,
+		} as const ),
+	setProcessing: () =>
+		( {
+			type: ACTION.SET_PROCESSING,
+		} as const ),
+	setRedirectUrl: ( url: string ) =>
+		( {
+			type: ACTION.SET_REDIRECT_URL,
+			url,
+		} as const ),
+	setProcessingResponse: ( data: PaymentResultDataType ) =>
+		( {
+			type: ACTION.SET_PROCESSING_RESPONSE,
+			data,
+		} as const ),
+	setComplete: ( data: Record< string, unknown > = {} ) =>
+		( {
+			type: ACTION.SET_COMPLETE,
+			data,
+		} as const ),
+	setBeforeProcessing: () =>
+		( {
+			type: ACTION.SET_BEFORE_PROCESSING,
+		} as const ),
+	setAfterProcessing: () =>
+		( {
+			type: ACTION.SET_AFTER_PROCESSING,
+		} as const ),
+	setHasError: ( hasError = true ) =>
+		( {
+			type: hasError ? ACTION.SET_HAS_ERROR : ACTION.SET_NO_ERROR,
+		} as const ),
+	incrementCalculating: () =>
+		( {
+			type: ACTION.INCREMENT_CALCULATING,
+		} as const ),
+	decrementCalculating: () =>
+		( {
+			type: ACTION.DECREMENT_CALCULATING,
+		} as const ),
+	setCustomerId: ( customerId: number ) =>
+		( {
+			type: ACTION.SET_CUSTOMER_ID,
+			customerId,
+		} as const ),
+	setOrderId: ( orderId: number ) =>
+		( {
+			type: ACTION.SET_ORDER_ID,
+			orderId,
+		} as const ),
+	setShouldCreateAccount: ( shouldCreateAccount: boolean ) =>
+		( {
+			type: ACTION.SET_SHOULD_CREATE_ACCOUNT,
+			shouldCreateAccount,
+		} as const ),
+	setOrderNotes: ( orderNotes: string ) =>
+		( {
+			type: ACTION.SET_ORDER_NOTES,
+			orderNotes,
+		} as const ),
+};