/**
 * The Look condition atoms that lower to a media query — 'viewport.width',
 * 'scheme.dark', 'motion.reduced' — read as shapes over the written expression,
 * plus the renderings a refusal about one quotes back.
 *
 * D115 P4 R3a: 'is this expression a viewport comparison' is a question about a
 * node, not about the analyzer, so it reads as a module.
 */
import { type Expression } from "@velarscript/compiler/extension";
export declare function isViewportComparison(expression: Expression): boolean;
export declare function flippedViewportComparison(expression: Expression): {
    readonly property: string;
    readonly operator: string;
    readonly threshold: Expression;
} | null;
export declare function isSchemeCondition(expression: Expression): boolean;
/** The subject name of a `subject.feature` shape, whether or not it is a Look subject. */
export declare function mediaSubjectShape(expression: Expression): {
    readonly subject: string;
    readonly feature: string;
} | null;
export declare function lookMediaVocabulary(): string;
/** A readable rendering of a breakpoint threshold for diagnostic guidance. */
export declare function lookSourceOf(expression: Expression): string;
/**
 * A syntactic rendering of one condition operand, used for the part of a Look
 * condition that does not lower to a selector or a media query: a runtime term
 * keeps its own scope, because two different runtime conditions really are two
 * different scopes.
 */
export declare function lookRuntimeSignature(expression: Expression): string;
export declare function lookKebab(value: string): string;
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