/**
 * A distribution parameter written as an EXPRESSION rather than a number.
 *
 * `lambda="Traffic * 0.5"` is an intensity driven by another column;
 * `sd="0.5 + 0.01 * _count"` is a sensor that grows noisier as the run goes on.
 * A bare number stays the ordinary case and costs nothing — the spec is parsed
 * once, exactly as before, and only a config that names a column comes here.
 *
 * Why this is allowed at all, when a per-row `repeat=` is not: how many uniform
 * draws a row consumes depends on WHICH distribution, never on its parameters.
 * The parameter changes the value the draws are turned into, not their number,
 * so the row stays computable without its predecessors — the property every
 * engine is built on. See `sequence/repeat.ts` for the case where that argument
 * fails and the answer had to be a whole-run quota instead.
 */
import type { AttrMap } from '../processor/attrs.js';
import type { SequenceBuildContext } from './context.js';
/**
 * The generator's attributes with every expression-valued parameter replaced by
 * its answer on row `i`.
 *
 * Reads through `ctx.valueAt`, which BOTH engines already fill — the in-memory
 * one from its registry, the streaming one from its lazy registry — so this
 * needed no new seam. The expression language is the same one `if=` and
 * `formula` use, so a parameter and a condition cannot come to mean different
 * things by the same words.
 *
 * A parameter that does not resolve to a number is left as the text it was, and
 * `parseDistribution` refuses it with the message it already has — which names
 * the parameter and the distribution, and is better than anything invented here.
 */
export declare function resolveParams(attrs: AttrMap, dynamic: readonly string[], ctx: SequenceBuildContext, row: number): ResolvedParams;
/** A resolved parameter set, and whether any of it read an empty cell. */
export interface ResolvedParams {
    readonly attrs: AttrMap;
    /** A referenced column was empty on this row, so nothing can be drawn. */
    readonly empty: boolean;
}
/**
 * One `<gen type="number" distribution="…">` column.
 *
 * Lifted out of the main builder whole, because the parameter resolution above
 * belongs beside it and the two together were what pushed `build.ts` past the
 * repo's ceiling on file length.
 */
export declare function distributionColumn(attrs: AttrMap, count: number, prng: () => number, ctx: SequenceBuildContext): string[];
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