import type { ContrastAllowEntry, ContrastConfig, ContrastLevel, ContrastMode, ContrastReversedTextConfig, ResolvedContrastConfig, ResolvedContrastReversedTextConfig } from '../types.js';
export declare const DEFAULT_CONTRAST_REVERSED_TEXT_CONFIG: ResolvedContrastReversedTextConfig;
export declare const DEFAULT_CONTRAST_CONFIG: ResolvedContrastConfig;
export declare const CONTRAST_LEVELS: readonly ContrastLevel[];
export declare const CONTRAST_MODES: readonly ContrastMode[];
export declare function resolveContrastReversedTextConfig(partial?: ContrastReversedTextConfig): ResolvedContrastReversedTextConfig;
/** A colour of an allow entry as `#rrggbb` (or `#rrggbbaa`) in lower
 *  case: `#` added, a short form spelled out. Undefined for no hex. */
export declare function normalContrastHex(color: unknown): string | undefined;
/** The allow entries that match something (#1124): colours that are no
 *  hex and entries that give no colour or style are dropped. */
export declare function resolveContrastAllow(allow: unknown): ContrastAllowEntry[];
/** A level or a mode written otherwise reads as the default
 *  (`collectConfigWarnings` reports it). */
export declare function resolveContrastConfig(partial?: ContrastConfig): ResolvedContrastConfig;
export declare function stripContrastDefaults(cfg?: ContrastConfig): ContrastConfig | undefined;
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