[hugomallet]

Part of #57 (§3) — removes two dead runtime dependencies.

Changes

• scroll-to-element → native element.scrollIntoView() — the package has been unmaintained since ~2018. scrollToFirstError keeps its guards and the focus({ preventScroll: true }) call from fix(Form): check every name in isFieldInvalid; guard and focus scrollToFirstError #61. Legacy align (top/middle/bottom) is mapped to block (start/center/end); native { behavior, block, inline } options are also accepted and forwarded as-is. Defaults: behavior: 'smooth', block: 'center', inline: 'nearest'. The call is guarded by typeof element.scrollIntoView === 'function': environments that do not implement it (e.g. consumers' jsdom test setups) skip scrolling without throwing, and the a11y focus move still runs.
• lodash.throttle → local src/lib/Form/throttle.js — the per-method lodash packages are deprecated. Minimal implementation reproducing the semantics the form relies on: leading + trailing edges, coalesced calls, cancel() (used by componentWillUnmount and memoGetValidator). Dedicated fake-timer tests. The DebouncedFunc JSDoc type from lodash is replaced by the local ThrottledFunc.
• package.json — removed scroll-to-element, lodash.throttle (dependencies) and @types/lodash.throttle (devDependencies); yarn.lock updated.

Semi-breaking (targets 0.7.0)

• The legacy scrollOptions offset, duration and ease are still accepted but ignored: the native API has no equivalent — scroll animation is delegated to the browser via behavior: 'smooth'. Custom animation duration/easing is lost. Documented in the JfvScrollOptions JSDoc. 0.7.0 is already required by the peerDeps narrowing of feat(FieldError): announce errors via role="alert" + fix react peerDep #59.
• Safari < 15.4: scrollIntoView ignores the options object there (treated as scrollIntoView(truthy)), resulting in an instant scroll aligned to top instead of a smooth centered scroll. Graceful degradation, no crash.

Tests

• jsdom does not implement scrollIntoView: tests mock it on Element.prototype (restored in afterAll) and assert the exact options object passed (defaults, legacy align mapping with ignored extras, native passthrough), plus a test proving that an element without scrollIntoView does not throw and still receives focus.
• Suite: 6 suites / 75 tests / 5 snapshots on master → 7 / 84 / 5 here, all green (CI=true yarn test:runtime); yarn type-check clean. Snapshot updated for the new scrollOptions default only.
• Every new test was mutation-checked (leading edge, coalescing, spurious trailing, cancel, align mapping, option forwarding, element lookup, scrollIntoView guard): each mutation failed the intended assertions for the right reason.

[hugomallet]

Self-review (assisted by Claude, review53 skill) — posted as COMMENT since I authored the PR.

Verdict: Approve with minor comments ✅

Scope strictly respected (7 files: src/lib/Form/* + package.json + yarn.lock). ESLint + tsc --noEmit clean on changed files. yarn.lock removes exactly the 3 announced packages plus their now-orphaned transitives (@types/lodash, the raf@^3.4.0 specifier from scroll-to-element).

Cleared after verification:

• throttle.js reproduces the lodash contract the form relies on: leading edge, trailing coalesced with the latest args, no spurious trailing after a single call, cancel() resets to a fresh leading edge (same as lodash, which zeroes lastInvokeTime on cancel). flush() is not used anywhere, so dropping it is safe.
• No timer leak: componentWillUnmount and memoGetValidator both call cancel(), which clears the pending timeout.
• scrollOptions back-compat: scrollOptions || {} guards null; legacy {offset, align, duration, ease} doesn't crash — align maps to block (explicit block wins), the rest is ignored as documented in the JfvScrollOptions JSDoc. defaultProps matches the updated snapshot.
• Tests: scrollIntoView mocked on Element.prototype (per-file jsdom, mockClear in beforeEach — no cross-test pollution); fake timers restored in afterEach.

🟡 Minor (grouped)

1. Form.js:377 — no guard on element.scrollIntoView. jsdom doesn't implement it (this PR's own tests mock it for exactly that reason), so a consumer's jsdom test that submits an invalid form now throws TypeError: element.scrollIntoView is not a function, where scroll-to-element previously degraded to a harmless "Not implemented" console warning. The throw also skips the element.focus({ preventScroll: true }) a11y focus from #61. Suggested: if (typeof element.scrollIntoView === 'function') element.scrollIntoView({ behavior, block, inline }); and keep focus() unconditional.
2. Old Safari note (< 15.4): scrollIntoViewOptions is unsupported there — an object argument behaves like scrollIntoView(truthy) (instant, align top). Degradation only, no crash; worth one line in the 0.7.0 release notes.
3. Form.test.js: consider an afterAll that deletes the Element.prototype.scrollIntoView mock — harmless today with Jest's per-file environment, just hygiene.

No blocking issue; item 1 is cheap and worth doing before merge.