/**
 * What the streaming builder refuses, and why — decided while the column is
 * built, never when a row is read.
 *
 * Every refusal here names a construct whose answer is a property of the WHOLE
 * column: a running total is the sum of the rows before it, a statistic needs
 * the rows after it as well, a date measured from a sibling needs a column the
 * lazy path cannot reach, a pack generator with a share apportions its quota
 * over the run.
 *
 * The timing is the load-bearing part. `buildExactDiskRegistry` wraps the
 * registry BUILD in a try/catch and falls back to the in-memory engine — that
 * fallback is what makes engine 3 "exact and bounded, or in memory when it
 * cannot be both". A refusal raised lazily, at the row that reads the value,
 * arrives long after that catch has returned, so it reaches the caller as an
 * error instead of a fallback. That is exactly what happened to the whole-column
 * pack check while it lived deep inside `buildGenValues`: 37 refusals fell back
 * correctly and that one escaped.
 *
 * Collected in one file because they are one idea, and because `stream-build.ts`
 * has a line ceiling that this group kept pushing it through.
 */
import type { GenSpec, SequenceSpec } from './types.js';
/**
 * Refuse `spec` if the streaming path cannot answer it a row at a time.
 *
 * Returns normally when it can. Ordered so the message a user sees names the
 * most specific reason: a `<gen type="date" of=…>` is a date before it is
 * anything else, and a pack generator is refused for its quota rather than for
 * being a template.
 */
export declare function refuseIfWholeColumn(spec: SequenceSpec): void;
/**
 * Refuse a GEN the lazy builder cannot answer a row at a time.
 *
 * The two here are refused per generator rather than per sequence, because a
 * compound sequence's fields carry their own — but they are the same idea as
 * everything above, and they belong to the same timing rule: raised while the
 * column is CONSTRUCTED, so engine 3's catch turns them into a fallback rather
 * than an error.
 */
export declare function refuseIfLazyImpossible(gen: GenSpec, streamId: string): void;
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