/**
 * The values a flow's keys hold, each read to one type or refused.
 *
 * Every key has one type, so a value that is not of it is a fault rather than
 * a coercion: `retry: "2"` was written by someone who meant something, and
 * guessing what is how a flow ends up running a way its file does not say.
 */
import type { FaultList } from "./fault.ts";
import type { FlowNode } from "./node.ts";
/** A non-empty string. */
export declare function text(value: unknown, at: string, faults: FaultList): string | undefined;
/** A whole number, zero or more. */
export declare function count(value: unknown, at: string, faults: FaultList): number | undefined;
/** A duration written `90s`, `10m` or `1h`, in milliseconds. */
export declare function duration(value: unknown, at: string, faults: FaultList): number | undefined;
/** `text` read as a duration the way a flow writes one, `90s`, `10m` or `1h`, in milliseconds; nothing when it is not one. */
export declare function parseDuration(text: string): number | undefined;
/** A list of non-empty strings, none twice. */
export declare function texts(value: unknown, at: string, faults: FaultList): string[] | undefined;
/** One of a closed set of words. */
export declare function oneOf<T extends string>(value: unknown, words: readonly T[], at: string, faults: FaultList): T | undefined;
/** `true` or `false`, written as such. */
export declare function flag(value: unknown, at: string, faults: FaultList): boolean | undefined;
/** A whole number, one or more. */
export declare function positive(value: unknown, at: string, faults: FaultList): number | undefined;
/**
 * The nodes of a sequence written with at least one, or `undefined`, saying
 * `why` when it was written empty.
 */
export declare function body(nodes: FlowNode[], written: unknown, at: string, faults: FaultList, why: string): FlowNode[] | undefined;
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