/**
 * FHIRPath collection-unsafe type-operator rewrite
 * -------------------------------------------------
 *
 * fhirpath.js (with a FHIR model loaded) throws
 *   "Expected singleton on left side of 'as'" / "...of 'is'"
 * whenever the `as` / `is` type operators are applied to a collection — e.g.
 * `component.value as Quantity`, where `component` repeats. The throw lands in
 * the constraint executor's catch block, so the constraint is silently skipped
 * (reported only as an informational evaluation-error). This is gap P-4:
 * `as`/`is` on non-singleton collections.
 *
 * Both operators have collection-safe equivalents that are identical for the
 * singleton case the operators were designed for:
 *
 * - `X as T`  →  `X.ofType(T)`        — filter to items of the type. For a
 *   singleton this returns the item if it matches (else empty), exactly like
 *   `as`.
 * - `X is T`  →  `X.all($this is T)`  — true iff every item is of the type.
 *   For a singleton (and for empty) this is exactly `X is T`; for a collection
 *   it is a sensible total semantics instead of a throw.
 *
 * `.type()` is left alone — it already works on collections.
 */
export declare function rewriteCollectionTypeOperators(expression: string): string;
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