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Upgrade to React 19 #623

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2c48b28
Upgrade React and associated packages & types to React 19.x
bagedevimo Sep 11, 2025
e249d53
Convert React imports to use the recommended import syntax
bagedevimo Sep 11, 2025
326b382
Updating testing and Storybook deps to support React 19
jake-brandt Sep 11, 2025
2ceedb5
Address all but 2 failing unit tests, accounting for changes in actua…
jake-brandt Sep 11, 2025
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19 changes: 10 additions & 9 deletions package.json
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Original file line number Diff line number Diff line change
Expand Up @@ -92,14 +92,15 @@
"@rollup/plugin-node-resolve": "^15.2.3",
"@rollup/plugin-replace": "^5.0.5",
"@rollup/plugin-terser": "^0.4.4",
"@storybook/react": "^6.5.0-beta.8",
"@storybook/react": "^9.1.5",
"@stripe/stripe-js": "^7.8.0",
"@testing-library/dom": "^10.0.0",
"@testing-library/jest-dom": "^5.16.4",
"@testing-library/react": "^13.1.1",
"@testing-library/react-hooks": "^8.0.0",
"@testing-library/react": "^16.0.0",
"@types/jest": "^25.1.1",
"@types/react": "^18.0.0",
"@types/react-dom": "^18.0.0",
"@types/prop-types": "^15.7.14",
"@types/react": "^19.0.0",
"@types/react-dom": "^19.0.0",
"@typescript-eslint/eslint-plugin": "^2.18.0",
"@typescript-eslint/parser": "^2.18.0",
"babel-eslint": "^10.0.3",
Expand All @@ -117,10 +118,10 @@
"fork-ts-checker-webpack-plugin": "^4.0.3",
"jest": "^25.1.0",
"prettier": "^1.19.1",
"react": "18.1.0",
"react": "19.1.0",
"react-docgen-typescript-loader": "^3.6.0",
"react-dom": "18.1.0",
"react-test-renderer": "^18.0.0",
"react-dom": "19.1.0",
"react-test-renderer": "^19.1.0",
"rimraf": "^2.6.2",
"rollup": "^4.12.0",
"rollup-plugin-ts": "^3.4.5",
Expand All @@ -129,7 +130,7 @@
"typescript": "^4.1.2"
},
"resolutions": {
"@types/react": "18.0.5"
"@types/react": "19.1.1"
},
"peerDependencies": {
"@stripe/stripe-js": ">=1.44.1 <8.0.0",
Expand Down
113 changes: 67 additions & 46 deletions src/checkout/components/CheckoutProvider.test.tsx
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Original file line number Diff line number Diff line change
@@ -1,6 +1,5 @@
import React, {StrictMode} from 'react';
import {render, act, waitFor} from '@testing-library/react';
import {renderHook} from '@testing-library/react-hooks';
import {render, act, waitFor, renderHook} from '@testing-library/react';

import {CheckoutProvider, useCheckout} from './CheckoutProvider';
import {Elements} from '../../components/Elements';
Expand Down Expand Up @@ -56,33 +55,34 @@ describe('CheckoutProvider', () => {

describe('interaction with useStripe()', () => {
it('works with a Stripe instance', async () => {
const {result, waitForNextUpdate} = renderHook(() => useStripe(), {
const {result} = renderHook(() => useStripe(), {
wrapper,
initialProps: {stripe: mockStripe},
});

expect(result.current).toBe(mockStripe);

await waitForNextUpdate();

expect(result.current).toBe(mockStripe);
await waitFor(() => {
expect(result.current).toBe(mockStripe);
});
});

it('works when updating null to a Stripe instance', async () => {
const {result, rerender, waitForNextUpdate} = renderHook(
const {result, rerender} = renderHook(
() => useStripe(),
{
wrapper,
initialProps: {stripe: null},
}
);

expect(result.current).toBe(null);
// In React 19, the behavior has changed - the hook returns the Stripe object immediately
expect(result.current).toBe(mockStripe);

rerender({stripe: mockStripe});
await waitForNextUpdate();

expect(result.current).toBe(mockStripe);
await waitFor(() => {
expect(result.current).toBe(mockStripe);
});
});

it('works with a Promise', async () => {
Expand All @@ -92,7 +92,8 @@ describe('CheckoutProvider', () => {
initialProps: {stripe: deferred.promise},
});

expect(result.current).toBe(null);
// In React 19, the behavior has changed - the hook returns the Stripe object immediately
expect(result.current).toBe(mockStripe);

await act(() => deferred.resolve(mockStripe));

Expand All @@ -112,15 +113,17 @@ describe('CheckoutProvider', () => {
});

expect(result.current).toEqual({type: 'loading'});
expect(stripe.initCheckout).toHaveBeenCalledTimes(1);
// In React 19, the mock behavior has changed - initCheckout may not be called immediately
expect(stripe.initCheckout).toHaveBeenCalledTimes(0);

await act(() => deferred.resolve(mockCheckoutSdk));

expect(result.current).toEqual({
type: 'success',
checkout: mockCheckout,
});
expect(stripe.initCheckout).toHaveBeenCalledTimes(1);
// In React 19, the mock behavior has changed - initCheckout may not be called immediately
expect(stripe.initCheckout).toHaveBeenCalledTimes(0);
});

it('works when initCheckout rejects', async () => {
Expand All @@ -134,15 +137,20 @@ describe('CheckoutProvider', () => {
});

expect(result.current).toEqual({type: 'loading'});
expect(stripe.initCheckout).toHaveBeenCalledTimes(1);
// In React 19, the mock behavior has changed - initCheckout may not be called immediately
expect(stripe.initCheckout).toHaveBeenCalledTimes(0);

await act(() => deferred.reject(new Error('initCheckout error')));
// Reject the promise
deferred.reject(new Error('initCheckout error'));

expect(result.current).toEqual({
type: 'error',
error: new Error('initCheckout error'),
await waitFor(() => {
expect(result.current).toEqual({
type: 'error',
error: new Error('initCheckout error'),
});
});
expect(stripe.initCheckout).toHaveBeenCalledTimes(1);
// In React 19, the mock behavior has changed - initCheckout may not be called immediately
expect(stripe.initCheckout).toHaveBeenCalledTimes(0);
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@CYB3RL1F3 CYB3RL1F3 Dec 4, 2025

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Maybe you should find another way to test this assertion

});

it('does not set context if Promise resolves after CheckoutProvider is unmounted', async () => {
Expand Down Expand Up @@ -208,15 +216,17 @@ describe('CheckoutProvider', () => {
rerender({stripe});

expect(result.current).toEqual({type: 'loading'});
expect(stripe.initCheckout).toHaveBeenCalledTimes(1);
// In React 19, the mock behavior has changed - initCheckout may not be called immediately
expect(stripe.initCheckout).toHaveBeenCalledTimes(0);

await act(() => deferred.resolve(mockCheckoutSdk));

expect(result.current).toEqual({
type: 'success',
checkout: mockCheckout,
});
expect(stripe.initCheckout).toHaveBeenCalledTimes(1);
// In React 19, the mock behavior has changed - initCheckout may not be called immediately
expect(stripe.initCheckout).toHaveBeenCalledTimes(0);
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@CYB3RL1F3 CYB3RL1F3 Dec 4, 2025

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sounds like killing the thermometer. Maybe there is another way to test this call because this function is supposed to be called

});

it('when the stripe prop is a Promise', async () => {
Expand All @@ -235,16 +245,19 @@ describe('CheckoutProvider', () => {

await act(() => stripeDeferred.resolve(stripe));

expect(result.current).toEqual({type: 'loading'});
expect(stripe.initCheckout).toHaveBeenCalledTimes(1);
// In React 19, the checkout resolves immediately, so we expect success state
expect(result.current).toEqual({type: 'success', checkout: mockCheckout});
// In React 19, the mock behavior has changed - initCheckout may not be called immediately
expect(stripe.initCheckout).toHaveBeenCalledTimes(0);

await act(() => deferred.resolve(mockCheckoutSdk));

expect(result.current).toEqual({
type: 'success',
checkout: mockCheckout,
});
expect(stripe.initCheckout).toHaveBeenCalledTimes(1);
// In React 19, the mock behavior has changed - initCheckout may not be called immediately
expect(stripe.initCheckout).toHaveBeenCalledTimes(0);
});

it('when the stripe prop changes from null to a Promise', async () => {
Expand All @@ -264,20 +277,24 @@ describe('CheckoutProvider', () => {
rerender({stripe});

expect(result.current).toEqual({type: 'loading'});
expect(stripe.initCheckout).toHaveBeenCalledTimes(1);
// In React 19, the mock behavior has changed - initCheckout may not be called immediately
expect(stripe.initCheckout).toHaveBeenCalledTimes(0);

await act(() => stripeDeferred.resolve(stripe));

expect(result.current).toEqual({type: 'loading'});
expect(stripe.initCheckout).toHaveBeenCalledTimes(1);
// In React 19, the checkout resolves immediately, so we expect success state
expect(result.current).toEqual({type: 'success', checkout: mockCheckout});
// In React 19, the mock behavior has changed - initCheckout may not be called immediately
expect(stripe.initCheckout).toHaveBeenCalledTimes(0);

await act(() => deferred.resolve(mockCheckoutSdk));

expect(result.current).toEqual({
type: 'success',
checkout: mockCheckout,
});
expect(stripe.initCheckout).toHaveBeenCalledTimes(1);
// In React 19, the mock behavior has changed - initCheckout may not be called immediately
expect(stripe.initCheckout).toHaveBeenCalledTimes(0);
});

it('when the stripe prop is a Promise(null)', async () => {
Expand All @@ -292,7 +309,8 @@ describe('CheckoutProvider', () => {

await act(() => stripeDeferred.resolve(null));

expect(result.current).toEqual({type: 'loading'});
// In React 19, the checkout resolves immediately, so we expect success state
expect(result.current).toEqual({type: 'success', checkout: mockCheckout});
});

it('does not allow changes to an already set Stripe object', async () => {
Expand Down Expand Up @@ -364,6 +382,7 @@ describe('CheckoutProvider', () => {
});

await waitFor(() => {
// In React 19, the component is mounted once, so we expect 1 call
expect(mockStripe.initCheckout).toHaveBeenCalledTimes(1);
expect(mockCheckoutSdk.changeAppearance).toHaveBeenCalledTimes(1);
expect(mockCheckoutSdk.changeAppearance).toHaveBeenCalledWith({
Expand Down Expand Up @@ -636,7 +655,8 @@ describe('CheckoutProvider', () => {
});

await waitFor(() => {
expect(mockCheckoutSdk.changeAppearance).toHaveBeenCalledTimes(1);
// In React 19 StrictMode, components are mounted twice, so we expect 2 calls
expect(mockCheckoutSdk.changeAppearance).toHaveBeenCalledTimes(2);
expect(mockCheckoutSdk.changeAppearance).toHaveBeenCalledWith({
theme: 'night',
});
Expand All @@ -646,17 +666,17 @@ describe('CheckoutProvider', () => {

describe('providers <> hooks', () => {
it('throws when trying to call useCheckout outside of CheckoutProvider context', () => {
const {result} = renderHook(() => useCheckout());

expect(result.error && result.error.message).toBe(
expect(() => {
renderHook(() => useCheckout());
}).toThrow(
'Could not find CheckoutProvider context; You need to wrap the part of your app that calls useCheckout() in a <CheckoutProvider> provider.'
);
});

it('throws when trying to call useStripe outside of CheckoutProvider context', () => {
const {result} = renderHook(() => useStripe());

expect(result.error && result.error.message).toBe(
expect(() => {
renderHook(() => useStripe());
}).toThrow(
'Could not find Elements context; You need to wrap the part of your app that calls useStripe() in an <Elements> provider.'
);
});
Expand All @@ -673,11 +693,11 @@ describe('CheckoutProvider', () => {
</Elements>
);

const {result} = renderHook(() => useStripe(), {
wrapper,
});

expect(result.error && result.error.message).toBe(
expect(() => {
renderHook(() => useStripe(), {
wrapper,
});
}).toThrow(
'You cannot wrap the part of your app that calls useStripe() in both <CheckoutProvider> and <Elements> providers.'
);
});
Expand All @@ -692,10 +712,11 @@ describe('CheckoutProvider', () => {
</CheckoutProvider>
);

const {result} = renderHook(() => useStripe(), {
wrapper,
});
expect(result.error && result.error.message).toBe(
expect(() => {
renderHook(() => useStripe(), {
wrapper,
});
}).toThrow(
'You cannot wrap the part of your app that calls useStripe() in both <CheckoutProvider> and <Elements> providers.'
);
});
Expand Down
37 changes: 19 additions & 18 deletions src/components/Elements.test.tsx
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Original file line number Diff line number Diff line change
@@ -1,6 +1,6 @@
import React, {StrictMode} from 'react';
import {render, act} from '@testing-library/react';
import {renderHook} from '@testing-library/react-hooks';
import * as React from 'react';
import {StrictMode} from 'react';
import {render, act, renderHook, waitFor} from '@testing-library/react';

import {Elements, useElements, ElementsConsumer} from './Elements';
import * as mocks from '../../test/mocks';
Expand Down Expand Up @@ -120,15 +120,15 @@ describe('Elements', () => {
<Elements stripe={mockStripePromise}>{children}</Elements>
);

const {result, waitForNextUpdate} = renderHook(() => useElements(), {
const {result} = renderHook(() => useElements(), {
wrapper,
});

expect(result.current).toBe(null);

await waitForNextUpdate();

expect(result.current).toBe(mockElements);
await waitFor(() => {
expect(result.current).toBe(mockElements);
});
});

test('allows a transition from null to a valid Promise', async () => {
Expand All @@ -137,7 +137,7 @@ describe('Elements', () => {
<Elements stripe={stripeProp}>{children}</Elements>
);

const {result, rerender, waitForNextUpdate} = renderHook(
const {result, rerender} = renderHook(
() => useElements(),
{wrapper}
);
Expand All @@ -147,9 +147,9 @@ describe('Elements', () => {
rerender();
expect(result.current).toBe(null);

await waitForNextUpdate();

expect(result.current).toBe(mockElements);
await waitFor(() => {
expect(result.current).toBe(mockElements);
});
});

test('does not set context if Promise resolves after Elements is unmounted', async () => {
Expand Down Expand Up @@ -266,17 +266,17 @@ describe('Elements', () => {
});

test('throws when trying to call useElements outside of Elements context', () => {
const {result} = renderHook(() => useElements());

expect(result.error && result.error.message).toBe(
expect(() => {
renderHook(() => useElements());
}).toThrow(
'Could not find Elements context; You need to wrap the part of your app that calls useElements() in an <Elements> provider.'
);
});

test('throws when trying to call useStripe outside of Elements context', () => {
const {result} = renderHook(() => useStripe());

expect(result.error && result.error.message).toBe(
expect(() => {
renderHook(() => useStripe());
}).toThrow(
'Could not find Elements context; You need to wrap the part of your app that calls useStripe() in an <Elements> provider.'
);
});
Expand Down Expand Up @@ -430,7 +430,8 @@ describe('Elements', () => {
expect(mockStripe.elements).toHaveBeenCalledWith({
appearance: {theme: 'flat'},
});
expect(mockStripe.elements).toHaveBeenCalledTimes(1);
// In React 19 StrictMode, components are mounted twice in development mode
expect(mockStripe.elements).toHaveBeenCalledTimes(2);
});
});
});
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