/**
 * Validation for `each="NAME"` on a `<line>`.
 *
 * `each` walks a list, and there are exactly two ways to get it wrong: name
 * something that is not a sequence, or name a sequence that holds no list.
 * Both would render silently as zero lines — the child table would simply come
 * out empty, with no error anywhere, which is the failure mode this project
 * keeps refusing to ship.
 * Spec: docs/specs/2026-07-19-each-repeating-a-line-per-list-element.md §4
 */
import { type Diagnostic } from '../errors/index.js';
import type { AttrContext, OpenCloseElementContext } from '../generated/TDCParser.js';
export interface EachContext {
    /** Sequence names declared in the env. */
    readonly declared: readonly string[];
    /** Of those, the ones whose generator repeats — walkable as a list. */
    readonly repeating: readonly string[];
    /** The pools — walkable record by record. */
    readonly pools: readonly string[];
}
export declare function checkLineEach(lineEl: OpenCloseElementContext, ctx: EachContext, diagnostics: Diagnostic[]): void;
/** The same rule one level up: a conditional `<line>` that holds a typed column. */
export declare function checkLineConditionalColumns(lineEl: OpenCloseElementContext, lineIf: AttrContext, diagnostics: Diagnostic[]): void;
/**
 * The names an `each` line may read besides the run's own: the two old positional built-ins, the
 * walked name's positions (`Doctors._last`), and — walking a pool — every field of its records.
 *
 * The line's own `if=` gets the same set without the positions, which count the lines that `if=`
 * lets through and so cannot be what decides them.
 */
export declare function eachNames(each: string | undefined, declared: readonly string[], poolFields: ReadonlyMap<string, readonly string[]>, forIf: boolean): readonly string[];
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