React Native: add explicit checkout link handling

[markmur]

Expose linkAction (open, handled, or cancel) and onLinkClick({url}) on checkout sheets and accelerated buttons. The native SDK applies the policy synchronously while JavaScript receives an asynchronous notification, so apps can route links themselves without delaying the native decision.

Ignored duplicate presentations preserve the active checkout’s original link policy and callbacks. Accelerated buttons cancel link events after dismissal or failure until a new checkout starts. The sample observes link notifications and leaves opening to the native SDK.

Stack

• React Native: add explicit checkout link handling #921
• React Native: adopt native checkout lifecycle events #829
• React Native: isolate presentation subscription cleanup #920
• Protocol: decode checkout snapshots without protocol metadata #919
• Bump Swift to 4.0.0-alpha.8 #946
• Ignore duplicate Swift checkout presentations #942

[github-actions]

React Native — Coverage Report

Lines	Statements	Branches	Functions
	94.95% (320/337)	89.13% (205/230)	100% (79/79)

[github-actions]

Bundle Size Budgets

Budget	Size	Limits	Result
React Native npm package (gzip)	115.22 KiB (+1023 B)	130 KiB soft / 150 KiB hard	✅ Within budget

Bundle and package size

Web bundle sizes cover shipped runtime JavaScript. Package sizes cover the full published archive, including any source maps, declarations, and documentation it contains.

Platform	Measurement	Compression	Base	Head	Delta
React Native	npm package (.tgz)	gzip	114.2 KiB	115.2 KiB	+1023 B

React Native package files (uncompressed)

These are uncompressed file sizes; they do not sum to the compressed package size above.

File	Base	Head	Delta
node_modules/@shopify/checkout-kit-protocol/src/generated/Models.ts	108.7 KiB	108.7 KiB	0 B
node_modules/@shopify/checkout-kit-protocol/src/generated/Models.d.ts	73.1 KiB	73.1 KiB	0 B
android/src/main/java/com/shopify/reactnative/checkoutkit/ShopifyCheckoutKitModule.java	17.7 KiB	17.7 KiB	+27 B
ios/AcceleratedCheckoutButtons.swift	14.3 KiB	14.8 KiB	+536 B
ios/ShopifyCheckoutKit.swift	14.7 KiB	14.8 KiB	+63 B
src/index.ts	14.0 KiB	14.2 KiB	+139 B
lib/commonjs/index.js	13.5 KiB	13.6 KiB	+58 B
lib/module/index.js	11.6 KiB	11.6 KiB	+58 B
src/index.d.ts	10.7 KiB	10.8 KiB	+77 B
node_modules/@shopify/checkout-kit-protocol/src/generated/ProtocolNotifications.ts	9.5 KiB	9.5 KiB	0 B
lib/module/index.js.map	9.4 KiB	9.4 KiB	+46 B
lib/commonjs/index.js.map	9.2 KiB	9.2 KiB	+46 B
node_modules/@shopify/checkout-kit-protocol/src/protocol_codec_runtime.ts	7.9 KiB	7.9 KiB	0 B
node_modules/@shopify/checkout-kit-protocol/src/generated/ProtocolRenameMap.ts	7.8 KiB	7.8 KiB	0 B
node_modules/@shopify/checkout-kit-protocol/src/generated/ProtocolNotifications.d.ts	7.6 KiB	7.6 KiB	0 B
src/components/AcceleratedCheckoutButtons.tsx	6.9 KiB	7.0 KiB	+94 B
lib/commonjs/components/AcceleratedCheckoutButtons.js	6.8 KiB	6.9 KiB	+98 B
android/src/main/java/com/shopify/reactnative/checkoutkit/CustomCheckoutListener.java	5.5 KiB	6.2 KiB	+704 B
lib/commonjs/components/AcceleratedCheckoutButtons.js.map	5.8 KiB	5.9 KiB	+110 B
lib/module/components/AcceleratedCheckoutButtons.js	5.6 KiB	5.7 KiB	+98 B
…and 117 smaller files

How sizes are measured

Measured from the PR base SHA and PR head SHA. Web bundle rows sum shipped .js, .mjs, and .cjs files under dist/, excluding source maps and declarations. The gzip bundle size sums files compressed individually with gzip -n -9. npm package sizes are gzip-compressed .tgz archives; Android AAR sizes are ZIP archives. Package sizes are not final app binary sizes.

[bitrise]

Bitrise builds

E2E · iOS CI

Install this build

Open Tophat, select your target device, then click Install. Links open on the Mac running Tophat.

SDK	Install
React Native	Install with Tophat

Checkout Kit E2E results

Status	Tags	Target	Platform	OS version tag	Device
✅	launch, checkout-presentation, checkout-completion, buyer-identity	react-native	ios	latest	iPhone 15 iOS 27 Beta
✅	launch, checkout-presentation, checkout-completion, buyer-identity	react-native	android	latest	Google Pixel 9 Android 17.0

[github-actions]

Coverage Report

Status	Platform / target	Lines	Branches	Functions	Report
⏭️	Web	—	—	—	Not run for this change
✅	React Native	95.08%	89.13%	100%	Full report
⏭️	Embedded Checkout Protocol (TS)	—	—	—	Not run for this change