extract some utils (#438)

src/components/Elements.tsx

@@ -15,43 +15,8 @@ import {
   extractAllowedOptionsUpdates,
   UnknownOptions,
 } from '../utils/extractAllowedOptionsUpdates';
-import {isStripe, isPromise} from '../utils/guards';
-
-const INVALID_STRIPE_ERROR =
-  'Invalid prop `stripe` supplied to `Elements`. We recommend using the `loadStripe` utility from `@stripe/stripe-js`. See https://stripe.com/docs/stripe-js/react#elements-props-stripe for details.';
-
-// We are using types to enforce the `stripe` prop in this lib, but in a real
-// integration `stripe` could be anything, so we need to do some sanity
-// validation to prevent type errors.
-const validateStripe = (maybeStripe: unknown): null | stripeJs.Stripe => {
-  if (maybeStripe === null || isStripe(maybeStripe)) {
-    return maybeStripe;
-  }
-
-  throw new Error(INVALID_STRIPE_ERROR);
-};
-
-type ParsedStripeProp =
-  | {tag: 'empty'}
-  | {tag: 'sync'; stripe: stripeJs.Stripe}
-  | {tag: 'async'; stripePromise: Promise<stripeJs.Stripe | null>};
-
-const parseStripeProp = (raw: unknown): ParsedStripeProp => {
-  if (isPromise(raw)) {
-    return {
-      tag: 'async',
-      stripePromise: Promise.resolve(raw).then(validateStripe),
-    };
-  }
-
-  const stripe = validateStripe(raw);
-
-  if (stripe === null) {
-    return {tag: 'empty'};
-  }
-
-  return {tag: 'sync', stripe};
-};
+import {parseStripeProp} from '../utils/parseStripeProp';
+import {registerWithStripeJs} from '../utils/registerWithStripeJs';
 
 interface ElementsContextValue {
   elements: stripeJs.StripeElements | null;
@@ -220,23 +185,7 @@ export const Elements: FunctionComponent<PropsWithChildren<ElementsProps>> = (({
 
   // Attach react-stripe-js version to stripe.js instance
   React.useEffect(() => {
-    const anyStripe: any = ctx.stripe;
-
-    if (
-      !anyStripe ||
-      !anyStripe._registerWrapper ||
-      !anyStripe.registerAppInfo
-    ) {
-      return;
-    }
-
-    anyStripe._registerWrapper({name: 'react-stripe-js', version: _VERSION});
-
-    anyStripe.registerAppInfo({
-      name: 'react-stripe-js',
-      version: _VERSION,
-      url: 'https://stripe.com/docs/stripe-js/react',
-    });
+    registerWithStripeJs(ctx.stripe);
   }, [ctx.stripe]);
 
   return (

src/utils/parseStripeProp.ts

@@ -0,0 +1,38 @@
+import * as stripeJs from '@stripe/stripe-js';
+import {isStripe, isPromise} from '../utils/guards';
+
+const INVALID_STRIPE_ERROR =
+  'Invalid prop `stripe` supplied to `Elements`. We recommend using the `loadStripe` utility from `@stripe/stripe-js`. See https://stripe.com/docs/stripe-js/react#elements-props-stripe for details.';
+
+// We are using types to enforce the `stripe` prop in this lib, but in a real
+// integration `stripe` could be anything, so we need to do some sanity
+// validation to prevent type errors.
+const validateStripe = (maybeStripe: unknown): null | stripeJs.Stripe => {
+  if (maybeStripe === null || isStripe(maybeStripe)) {
+    return maybeStripe;
+  }
+
+  throw new Error(INVALID_STRIPE_ERROR);
+};
+
+type ParsedStripeProp =
+  | {tag: 'empty'}
+  | {tag: 'sync'; stripe: stripeJs.Stripe}
+  | {tag: 'async'; stripePromise: Promise<stripeJs.Stripe | null>};
+
+export const parseStripeProp = (raw: unknown): ParsedStripeProp => {
+  if (isPromise(raw)) {
+    return {
+      tag: 'async',
+      stripePromise: Promise.resolve(raw).then(validateStripe),
+    };
+  }
+
+  const stripe = validateStripe(raw);
+
+  if (stripe === null) {
+    return {tag: 'empty'};
+  }
+
+  return {tag: 'sync', stripe};
+};

src/utils/registerWithStripeJs.ts

@@ -0,0 +1,13 @@
+export const registerWithStripeJs = (stripe: any) => {
+  if (!stripe || !stripe._registerWrapper || !stripe.registerAppInfo) {
+    return;
+  }
+
+  stripe._registerWrapper({name: 'react-stripe-js', version: _VERSION});
+
+  stripe.registerAppInfo({
+    name: 'react-stripe-js',
+    version: _VERSION,
+    url: 'https://stripe.com/docs/stripe-js/react',
+  });
+};