[WC-3450] Complete LeafletMap MobX migration with ViewModel

[iobuhov]

Pull request type

Refactoring (e.g. file rename, variable rename, etc.)

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Description

This PR completes the MobX migration for the LeafletMap component by:

Key Changes:

• ✨ Created LeafletMapViewModel to handle all map logic with MobX reactions
• 🔨 Simplified LeafletMap.tsx component (removed 184 lines) to focus on rendering
• 📦 Extracted marker creation logic into src/utils/leaflet-markers.ts
• 🏗️ Set up proper DI with useLeafletMapVM injection hook
• 🧪 Updated tests to work with new ViewModel architecture
• 🎨 Fixed all linting issues (import ordering, return types)

Architecture:

• ViewModel (LeafletMapViewModel): Manages map instance, tile layer, markers, and reactivity
• Component (LeafletMap): Pure presentational component using ref callback for setup
• Services: Integrated with LocationResolverService and CurrentLocationService
• Reactive updates: MobX reaction syncs markers when locations change

Testing:

• ✅ All 90 tests passing
• ✅ 87% code coverage maintained
• ✅ Linting clean (no errors or warnings)

Impact:

• 18 files changed
• 311 insertions(+), 284 deletions(-)
• Better separation of concerns
• More maintainable and testable code

This PR builds on the existing MobX infrastructure and completes the migration started in the parent branch.

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What should be covered while testing?

1. Map Rendering: Verify the map renders correctly with markers
2. Marker Updates: Check that markers update reactively when data changes
3. Auto Zoom: Test automatic zoom behavior with multiple markers
4. Manual Zoom: Verify manual zoom controls work correctly
5. Current Location: Test current location marker appears and updates
6. Map Interactions: Drag, scroll, and zoom controls function properly
7. Different Providers: Test with both OpenStreetMap and other providers

Test in Mendix Studio Pro:

• Add Maps widget to a page with data source
• Verify markers appear at correct locations
• Test adding/removing markers dynamically
• Check zoom and pan behavior
• Verify no console errors or memory leaks

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🤖 Generated with Claude Code

[r0b1n]

When expression is still loading, value is going to be undefined for a bit bfore taking final shape, it shouldn't fall back to apiKey when apiKeyExp is not undefined. The sign that expression is not configured is that whole apiKeyExp is undefined, not just value.

[iobuhov]

Good point, but I don't think it's possible to configure both. You ether have API key exp, or API key.

[github-actions]

AI Code Review

🔶 Changes requested — one or more medium-severity items must be addressed

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What was reviewed

File	Change
src/Maps.tsx	Rewired to use useMapsContainer + ContainerProvider (gallery pattern)
src/Maps.xml	Removed advanced property
src/Maps.editorConfig.ts	Removed platform branching, added deprecation warnings
src/components/MapsWidget.tsx	New observer component bridging MobX model and map views
src/components/LeafletMap.tsx	Stripped react-leaflet, now delegates to LeafletMapViewModel via ref callback
src/components/GoogleMap.tsx	Import reorder only
src/model/atoms/apiKey.atom.ts	New reactive API key atom with caching
src/model/atoms/geodecodeApiKey.atom.ts	Same pattern for geodecode key
src/model/atoms/__tests__/apiKey.atom.spec.ts	Unit tests for atom
src/model/atoms/__tests__/geodecodeApiKey.atom.spec.ts	Unit tests for geodecode atom
src/model/containers/Maps.container.ts	Binds atoms, wires LeafletMapViewModel
src/model/containers/Root.container.ts	Binds geocode and location functions
src/model/containers/createMapsContainer.ts	Factory helper
src/model/hooks/injection-hooks.ts	DI hooks for all tokens
src/model/hooks/useMapsContainer.ts	React hook wrapping container lifecycle
src/model/services/CurrentLocation.service.ts	New service replacing inline useEffect/useState
src/model/services/LocationResolver.service.ts	Updated to use injected geodecode atom
src/model/services/__tests__/CurrentLocation.spec.ts	4 tests covering service lifecycle
src/model/services/__tests__/LocationResolver.*.spec.ts	Existing test suites
src/model/tokens.ts	Added apiKey, geodecodeApiKey, leafletMapVM tokens
src/model/viewmodels/LeafletMap.viewModel.ts	New ViewModel managing Leaflet imperatively
src/utils/geodecode.ts	Removed legacy hook, kept convertAddressToLatLng
src/utils/leaflet-markers.ts	Extracted marker creation logic
src/utils/mock-container-props.ts	Removed advanced prop
src/__tests__/Maps.spec.tsx	2 integration tests
src/components/__tests__/LeafletMap.spec.tsx	Rewrote 9 snapshot tests → 13 structural tests
src/components/__tests__/MapsWidget.spec.tsx	6 render-gating tests
src/components/__tests__/GoogleMap.spec.tsx	Wrapped renders in act()
CHANGELOG.md	Unreleased entry added
package.json	Replaced react-leaflet with explicit mobx/mobx-react-lite
typings/MapsProps.d.ts	Regenerated (removed advanced)
openspec/	Archived completed changes; new in-progress change

Skipped (out of scope): pnpm-lock.yaml, openspec/ docs only

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Findings

🔶 Medium — useEffect deps array missing in useMapsContainer

File: src/model/hooks/useMapsContainer.ts line 15
Problem: useEffect(() => mainProvider.setProps(props)) has no dependency array, so it runs after every render — not only when props change. This is likely intentional (MobX gate update), but without the dep array it re-runs on every render caused by unrelated state changes in parent trees, which could cause unnecessary work.
Fix: Add props as the dependency (or document the intentional omission with a comment):

useEffect(() => mainProvider.setProps(props), [mainProvider, props]);

If the intent is to always sync (because the gate diffs internally), add a short comment explaining that.

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🔶 Medium — CurrentLocationService does not react to showCurrentLocation changing at runtime

File: src/model/services/CurrentLocation.service.ts lines 26–43
Problem: setup() checks showCurrentLocation once at mount time, then fires getLocation() and returns a disposer that only sets disposed = true. If the user toggles showCurrentLocation from false → true after mount, the location is never resolved. The PR description and the archived design doc say "Resolves location when option becomes true" and "Clears location when option becomes false" are design goals, but the current implementation does not use a MobX reaction on the prop — it reads a snapshot at setup() time.
Fix: Wrap in a reaction on this.config.showCurrentLocation (or read directly from mainGate.props):

setup(): () => void {
    return reaction(
        () => this.config.showCurrentLocation,  // or mainGate.props.showCurrentLocation
        (show) => {
            if (!show) { this.updateLocation(undefined); return; }
            let stale = false;
            this.getLocation()
                .then(loc => { if (!stale) this.updateLocation(loc); })
                .catch(e => console.error(e));
            return () => { stale = true; };  // reaction cleanup
        },
        { fireImmediately: true }
    );
}

Note: The design doc says "Clears location when option becomes false" and "Ignores stale responses" — neither is implemented.

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🔶 Medium — Missing tests for CurrentLocationService reactive behavior

File: src/model/services/__tests__/CurrentLocation.spec.ts
Problem: The existing test suite has 4 tests but the archived design doc specifies 6 (including "Resolves location when option becomes true" and "Clears location when option becomes false"). These integration scenarios are missing. Given the service currently doesn't support runtime toggling (see finding above), these tests would also catch the regression.
Fix: Add the two missing scenarios from the design doc before merging.

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⚠️ Low — Inline style template literal in MapsWidget loading state

File: src/components/MapsWidget.tsx line 19
Note: The early-return div uses a template literal for className:

<div className={`widget-maps ${props.class}`} ...>

All other render paths use classNames("widget-maps", props.class). For consistency (and to avoid a trailing space when props.class is empty), use classNames here too:

import classNames from "classnames";
<div className={classNames("widget-maps", props.class)} style={...} />

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⚠️ Low — LeafletMap.viewModel.ts tile layer not updated on provider/token change at runtime

File: src/model/viewmodels/LeafletMap.viewModel.ts lines 52–55
Note: The tile layer is created once in setupMap() and never updated if mapProvider or apiKey change at runtime. The reaction only observes locations and currentLocation. If a user changes the map provider in Studio Pro at runtime, the tile layer will not update. This may be out of scope for this PR (it's an existing limitation) but worth flagging for a follow-up.

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Positives

• The MobX container architecture is well-structured with clear define/init/postInit phases, matching the gallery pattern exactly.
• Removing react-leaflet and replacing it with the imperative Leaflet API eliminates the known default-icon hack and simplifies the dep graph — well-motivated change.
• The apiKeyAtom caching via a closure variable inside computed is a clean, idiomatic approach; the design doc explains the reasoning clearly (MobX drops deps on non-reads once cached !== null).
• Snapshot tests for LeafletMap were replaced with structural/behavioral assertions — this is the right call: snapshot tests on react-leaflet wrapper DOM were fragile and unreadable.
• The LeafletMapViewModel properly disposes the reaction and calls map.remove() in disposeMap(), preventing memory leaks.
• All OpenSpec change artifacts are archived cleanly, and the in-progress maps-defer-render-until-key change is properly staged.