Function useFormulaViewAnchor

useFormulaViewAnchor(
    sheet: ISheet,
    showFormulas: boolean,
    token?: unknown,
): FormulaViewAnchor | null
The shared formula-view spotlight source: while sheetView.isShowFormulas() is on, tracks the sheet's selection anchor and — when it sits on a formula cell — returns that formula's tokens and scoped reference ranges. Consumed by SheetCellLayer (suppress the anchor's plain tile text + overlay the colored FormulaCellRenderer) and SheetReferenceLayer (outline the references via the ranges picker), so the two always agree on what is spotlighted — and colors line up, both keying off referenceIndex.
Parameters
- sheet: ISheet
- showFormulas: boolean
- Optionaltoken: unknown
Returns FormulaViewAnchor | null

Remarks
Re-renders on onSelectionChange only while enabled. The derivation is memoized on the anchor (the sdk selection's coords object is replaced only on a real change), so per-frame renders (scroll) never re-tokenize; token lets a caller bust it when cell CONTENT changed (e.g. the cells layer's visible-range cache token).