Protocol: decode checkout snapshots without protocol metadata

[markmur]

Native Kit checkout snapshots omit protocol metadata. Add a schema-aware decoder that accepts these snapshots, converts known fields to camelCase, validates required checkout data, and preserves extension and dictionary keys.

The shared codec writes own data properties so __proto__ remains data, and rejects extension keys that collide with schema aliases instead of allowing them to overwrite typed fields.

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]

Protocol — Coverage Report

Lines	Statements	Branches	Functions
	94.05% (174/185)	89.06% (114/128)	91.66% (33/36)

[github-actions]

React Native — Coverage Report

Lines	Statements	Branches	Functions
	90.97% (363/399)	87.29% (213/244)	100% (92/92)

[github-actions]

Web — Coverage Report

Lines	Statements	Branches	Functions
	95.52% (427/447)	86.64% (227/262)	97.19% (104/107)

[github-actions]

Bundle Size Budgets

Budget	Size	Limits	Result
Web JavaScript (uncompressed)	35.21 KiB (+225 B)	35 KiB soft / 50 KiB hard	⚠️ Acceptance required
React Native npm package (gzip)	120.05 KiB (+441 B)	130 KiB soft / 150 KiB hard	✅ Within budget

Repository writers, including the PR author, can accept current soft-budget breaches with a reason:

/accept-size web Explain why this increase is necessary.

Use one command per platform; several lines can share a comment. Post after this report is ready for the current head. Commands in edited comments are not accepted.

Acceptance applies to each currently exceeded metric up to its recorded size. Further growth or a newly exceeded metric needs fresh acceptance. Hard-budget increases require a reviewed change to .ci/bundle-size-budgets.json.

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
Web	JavaScript bundle	Uncompressed	35.0 KiB	35.2 KiB	+225 B
Web	JavaScript bundle	gzip	10.8 KiB	10.9 KiB	+78 B
Web	npm package (.tgz)	gzip	93.1 KiB	93.7 KiB	+596 B
React Native	npm package (.tgz)	gzip	119.6 KiB	120.1 KiB	+441 B

Web package files (uncompressed)

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

File	Base	Head	Delta
dist/index.js.map	255.4 KiB	257.3 KiB	+1.8 KiB
dist/custom-elements.json	51.9 KiB	51.9 KiB	0 B
dist/index.d.ts	48.5 KiB	48.5 KiB	0 B
dist/index.js	35.0 KiB	35.2 KiB	+225 B
README.md	21.7 KiB	21.7 KiB	0 B
package.json	3.6 KiB	3.6 KiB	0 B
LICENSE	1.1 KiB	1.1 KiB	0 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	16.2 KiB	16.2 KiB	0 B
ios/ShopifyCheckoutKit.swift	16.1 KiB	16.1 KiB	0 B
ios/AcceleratedCheckoutButtons.swift	14.1 KiB	14.1 KiB	0 B
src/components/AcceleratedCheckoutButtons.tsx	13.0 KiB	13.0 KiB	0 B
src/index.ts	12.7 KiB	12.7 KiB	0 B
lib/commonjs/index.js	12.4 KiB	12.4 KiB	0 B
lib/commonjs/components/AcceleratedCheckoutButtons.js	11.4 KiB	11.4 KiB	0 B
src/index.d.ts	11.3 KiB	11.3 KiB	0 B
lib/commonjs/components/AcceleratedCheckoutButtons.js.map	10.4 KiB	10.4 KiB	0 B
lib/module/index.js	10.4 KiB	10.4 KiB	0 B
lib/module/components/AcceleratedCheckoutButtons.js	10.2 KiB	10.2 KiB	0 B
node_modules/@shopify/checkout-kit-protocol/src/generated/ProtocolNotifications.ts	9.5 KiB	9.5 KiB	0 B
lib/module/components/AcceleratedCheckoutButtons.js.map	9.1 KiB	9.1 KiB	0 B
lib/module/index.js.map	8.1 KiB	8.1 KiB	0 B
src/present-dispatcher.ts	8.0 KiB	8.0 KiB	0 B
node_modules/@shopify/checkout-kit-protocol/src/protocol_codec_runtime.ts	6.4 KiB	7.9 KiB	+1.5 KiB
lib/commonjs/index.js.map	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
…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