fix: support SDK 54 BaseMods API and multiple widget-type targets

[jackrobinsonuk]

Problem

Two independent bugs that surface together when using this package with Expo SDK 54 and multiple type: "widget" targets.

Bug 1 — BaseMods.withGeneratedBaseMods / BaseMods.provider removed in SDK 54

BaseMods.withGeneratedBaseMods and BaseMods.provider were removed from the BaseMods object in SDK 54's @expo/config-plugins. They are now standalone exports from @expo/config-plugins/build/plugins/createBaseMod. With the old import, prebuild fails immediately with BaseMods.provider is not a function.

Bug 2 — Multiple type: "widget" targets clobber each other

Both home screen widgets and Live Activities share the com.apple.widgetkit-extension extension point identifier. getExtensionTargets() returns all targets of that type. When a project has more than one, the ?? targets[0] fallback in applyXcodeChanges silently picks the first existing target instead of creating a new one — clearing its buildConfigurationList reference and then crashing on:

TypeError: [ios.xcodeProjectBeta2]: withIosXcodeProjectBeta2BaseMod:
Cannot read properties of undefined (reading 'removeFromProject')
    at applyXcodeChanges (with-xcode-changes.js:200:53)

Fix

• Bug 1: Replace BaseMods import with direct named imports of provider and withGeneratedBaseMods from @expo/config-plugins/build/plugins/createBaseMod
• Bug 2: Remove the ?? targets[0] fallback — if no target matches by productName, let it fall through to the creation path so each uniquely-named target is always created independently

Testing

Validated locally against a real production app that has exactly the Bug 2 crash scenario — three type: "widget" targets:

Target	Bundle ID
habits_widget	com.fittech.habits_widget
hydration_widget	com.fittech.hydration_widget
live_activity	com.fittech.app.LiveActivity

The patched build was dropped into the app's node_modules and npx expo prebuild --platform ios --clean was run. Prebuild completed successfully with all three widget targets created independently.

Test plan

• bunx expo-module typecheck passes
• bun test (unit tests) passes
• E2E tests (bun run test:e2e)

Closes #144

[jackrobinsonuk]

Hey @EvanBacon - have you had chance to look at this please?

[JustJoostNL]

@EvanBacon Would love to see this! Currently it's impossible to separate widgets/live activities across multiple targets, which is important to avoid hitting the memory limits.