test: add expectTypeOf coverage for src/* type exports#151
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Enables Vitest's typecheck runner (scoped to tests/unit/**/*.test-d.ts) so it runs alongside the regular suite via `vitest run`, and adds type-level assertions for every exported type/signature in src/*: the intersect action, intersectAttachment, createIntersectionGroup, createIntersectionObserver, and both components' prop/bindable shapes.
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metonym/fix-svelte-import-alias - svelte-intersection-observer PR #151
July 5, 2026 19:36
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Adds a type-level test suite (tests/unit/types.test-d.ts) that uses Vitest's expectTypeOf to assert on every exported type and function signature from src/*: IntersectActionOptions, IntersectGroupSharedOptions, IntersectGroupNodeOptions, IntersectionGroup, the intersect action, intersectAttachment, createIntersectionGroup, IntersectionObserverState, createIntersectionObserver, and the props/bindings of both the IntersectionObserver and MultipleIntersectionObserver components. Imports use the real package subpaths (e.g. svelte-intersection-observer/IntersectionObserver.svelte) via the existing tsconfig path mapping, rather than relative paths into src.
vitest.config.ts now enables typecheck, scoped to tests/unit/**/*.test-d.ts, so these run alongside the regular suite in a single vitest run/test:unit invocation with no separate command needed.
Low risk: this only adds a new test file and a scoped config option. The main thing to watch is that the typecheck runner adds a bit of extra time to test:unit (a few seconds, spawns tsc), and that future changes to the public type exports will now fail CI if they drift from these assertions, which is the intended effect.